.. title: Ổ cắm và phích cắm điện - Hướng dẫn kết nối NEMA
.. sên: ổ cắm và phích cắm điện
.. ngày: 26-01-2026 12:00:00 UTC
.. tags: điện, năng lượng, nema, đầu nối, máy tính, công cụ
.. chuyên mục: Bài viết
.. liên kết:
.. mô tả: Trực quan hóa đầu nối nguồn NEMA tương tác hiển thị các cặp phích cắm/ổ cắm, sơ đồ nối dây và khuyến nghị AWG
.. loại: văn bản
<style>
    .nema-container {
        max-width: 1200px;
        margin: 20px auto;
        padding: 20px;
    }

    .tool-header {
        margin-bottom: 30px;
        padding: 25px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        border-radius: 12px;
        box-shadow: 0 4px 6px rgba(0,0,0,0.1);
        color: white;
    }

    .tool-header h2 {
        margin-top: 0;
        color: white;
        font-size: 28px;
        margin-bottom: 10px;
    }

    .tool-header p {
        margin: 10px 0;
        opacity: 0.95;
        font-size: 15px;
        line-height: 1.6;
    }

    .control-section {
        background: white;
        border-radius: 8px;
        padding: 20px;
        margin-bottom: 20px;
        box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    }

    .control-row {
        display: flex;
        gap: 20px;
        align-items: flex-end;
        flex-wrap: wrap;
    }

    .control-group {
        flex: 1;
        min-width: 200px;
    }

    .control-group label {
        display: block;
        font-weight: bold;
        color: #333;
        margin-bottom: 8px;
        font-size: 14px;
    }

    .control-group select {
        width: 100%;
        padding: 12px;
        font-size: 16px;
        border: 2px solid rgba(102, 126, 234, 0.3);
        border-radius: 6px;
        background: #f9f9f9;
        cursor: pointer;
        transition: all 0.3s ease;
    }

    .control-group select:focus {
        outline: none;
        border-color: #667eea;
        background: white;
        box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    }

    .visualization-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
        margin-bottom: 20px;
    }

    .connector-panel {
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 8px;
        overflow: hidden;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .panel-header {
        background: linear-gradient(135deg, #4CAF50 0%, #45a049 100%);
        color: white;
        padding: 12px 20px;
        font-weight: bold;
        font-size: 16px;
    }

    .panel-header.receptacle {
        background: linear-gradient(135deg, #2196F3 0%, #1976d2 100%);
    }

    .panel-header.plug {
        background: linear-gradient(135deg, #FF9800 0%, #f57c00 100%);
    }

    .panel-content {
        padding: 20px;
        display: flex;
        flex-direction: column;
        align-items: center;
        min-height: 280px;
        background: #fafafa;
    }

    .connector-svg {
        width: 220px;
        height: 220px;
    }

    .connector-label {
        margin-top: 15px;
        font-size: 14px;
        color: #666;
        text-align: center;
    }

    .wiring-section {
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 8px;
        overflow: hidden;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        margin-bottom: 20px;
    }

    .wiring-header {
        background: linear-gradient(135deg, #9C27B0 0%, #7B1FA2 100%);
        color: white;
        padding: 12px 20px;
        font-weight: bold;
        font-size: 16px;
    }

    .wiring-content {
        padding: 20px;
        background: #fafafa;
    }

    .wiring-diagram {
        display: flex;
        justify-content: center;
        margin-bottom: 20px;
    }

    .wiring-svg {
        max-width: 100%;
        height: 200px;
    }

    .wire-legend {
        display: flex;
        justify-content: center;
        gap: 20px;
        flex-wrap: wrap;
        padding: 15px;
        background: white;
        border-radius: 6px;
        border: 1px solid #e0e0e0;
    }

    .wire-item {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 14px;
    }

    .wire-color {
        width: 24px;
        height: 12px;
        border-radius: 3px;
        border: 1px solid rgba(0,0,0,0.2);
    }

    .wire-color.hot { background: #000000; }
    .wire-color.hot2 { background: #CC0000; }
    .wire-color.hot3 { background: #0066CC; }
    .wire-color.neutral { background: #FFFFFF; border: 1px solid #999; }
    .wire-color.ground { background: #00AA00; }
    .wire-color.ground-bare { background: linear-gradient(90deg, #B87333 0%, #CD7F32 50%, #B87333 100%); }

    .specs-section {
        background: white;
        border: 1px solid #e0e0e0;
        border-radius: 8px;
        overflow: hidden;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
        margin-bottom: 20px;
    }

    .specs-header {
        background: linear-gradient(135deg, #607D8B 0%, #455A64 100%);
        color: white;
        padding: 12px 20px;
        font-weight: bold;
        font-size: 16px;
    }

    .specs-content {
        padding: 20px;
    }

    .specs-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
        margin-bottom: 20px;
    }

    .spec-card {
        background: #f5f5f5;
        padding: 15px;
        border-radius: 6px;
        text-align: center;
        border-left: 4px solid #4CAF50;
    }

    .spec-value {
        font-size: 24px;
        font-weight: bold;
        color: #333;
        font-family: 'Courier New', monospace;
    }

    .spec-label {
        font-size: 12px;
        color: #666;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        margin-top: 5px;
    }

    .uses-list {
        background: #e3f2fd;
        border: 1px solid #2196F3;
        border-radius: 6px;
        padding: 15px;
        margin-top: 15px;
    }

    .uses-list h4 {
        margin: 0 0 10px 0;
        color: #1565c0;
        font-size: 14px;
    }

    .uses-list ul {
        margin: 0;
        padding-left: 20px;
        color: #333;
    }

    .uses-list li {
        margin: 5px 0;
        font-size: 14px;
    }

    .connector-notes {
        background: #fff3e0;
        border: 1px solid #FF9800;
        border-radius: 6px;
        padding: 15px;
        margin-top: 15px;
        font-size: 14px;
        color: #e65100;
    }

    .awg-table-section {
        margin-top: 20px;
        padding: 15px;
        background: #f5f5f5;
        border: 1px solid #ddd;
        border-radius: 6px;
    }

    .awg-table-section h4 {
        margin: 0 0 15px 0;
        color: #333;
        font-size: 14px;
    }

    .awg-table {
        width: 100%;
        border-collapse: collapse;
        font-size: 13px;
    }

    .awg-table th {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
        padding: 10px;
        text-align: center;
    }

    .awg-table td {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        text-align: center;
    }

    .awg-table tr:hover {
        background: #e3f2fd;
    }

    .awg-table .highlight {
        background: #c8e6c9;
        font-weight: bold;
    }

    .info-section {
        background: white;
        border-radius: 8px;
        padding: 20px;
        margin-top: 30px;
        border-top: 3px solid #4CAF50;
        box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    }

    .info-section h3 {
        color: #4CAF50;
        margin-top: 0;
    }

    .info-section p {
        line-height: 1.6;
        color: #555;
    }

    .info-grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 20px;
        margin-top: 20px;
    }

    .info-card {
        background: #f5f5f5;
        padding: 15px;
        border-radius: 8px;
        border-left: 4px solid #667eea;
    }

    .info-card h4 {
        margin: 0 0 10px 0;
        color: #333;
        font-size: 15px;
    }

    .info-card p {
        margin: 0;
        font-size: 14px;
        color: #666;
    }

    .nema-code-table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 15px;
        font-size: 14px;
    }

    .nema-code-table th {
        background: #667eea;
        color: white;
        padding: 10px;
        text-align: left;
    }

    .nema-code-table td {
        padding: 10px;
        border-bottom: 1px solid #e0e0e0;
    }

    .nema-code-table tr:hover {
        background: #f5f5f5;
    }

    .safety-note {
        background: #ffebee;
        border: 1px solid #f44336;
        border-radius: 6px;
        padding: 15px;
        margin-top: 20px;
    }

    .safety-note h4 {
        margin: 0 0 10px 0;
        color: #c62828;
    }

    .safety-note ul {
        margin: 0;
        padding-left: 20px;
        color: #333;
    }

    /* SVG Styling */
    .connector-face {
        fill: #f0f0f0;
        stroke: #333;
        stroke-width: 3;
    }

    .slot {
        fill: #1a1a1a;
        stroke: #000;
        stroke-width: 1;
    }

    .pin {
        fill: #C0C0C0;
        stroke: #808080;
        stroke-width: 1;
    }

    .terminal-label {
        font-size: 10px;
        font-weight: bold;
        fill: #333;
        text-anchor: middle;
    }

    .connector-type-label {
        font-size: 14px;
        font-weight: bold;
        fill: #667eea;
        text-anchor: middle;
    }

    /* Wire diagram styling */
    .wire-line {
        stroke-width: 4;
        stroke-linecap: round;
        fill: none;
    }

    .wire-hot { stroke: #000000; }
    .wire-hot2 { stroke: #CC0000; }
    .wire-hot3 { stroke: #0066CC; }
    .wire-neutral { stroke: #CCCCCC; stroke-dasharray: none; }
    .wire-ground { stroke: #00AA00; }

    .terminal-circle {
        stroke-width: 2;
        stroke: #333;
    }

    /* Responsive */
    @media (max-width: 768px) {
        .visualization-grid {
            grid-template-columns: 1fr;
        }

        .control-row {
            flex-direction: column;
        }

        .control-group {
            width: 100%;
        }

        .specs-grid {
            grid-template-columns: 1fr 1fr;
        }

        .wire-legend {
            flex-direction: column;
            align-items: flex-start;
        }
    }
</style>
<div class="nema-container">
<div class="tool-header">
<h2>Hướng dẫn kết nối nguồn NEMA</h2>
<p>Trực quan hóa tương tác của các đầu nối nguồn NEMA (Hiệp hội các nhà sản xuất điện quốc gia). Xem cấu hình phích cắm và ổ cắm, sơ đồ nối dây và thông số kỹ thuật điện cho các ổ cắm điện ở Bắc Mỹ.</p>
<p><strong>Đặc trưng:</strong>37 cấu hình lưỡi thẳng NEMA cùng với các loại khóa, sơ đồ nhìn từ mặt, sơ đồ nối dây, khuyến nghị về thước đo dây AWG và hướng dẫn an toàn.</p>
</div>
<div class="control-section">
<div class="control-row">
<div class="control-group">
<label for="connectorType">Chọn loại trình kết nối NEMA:</label>
<select id="connectorType">
<optgroup label="NEMA 1 - 125V 2-Wire (No Ground)">
<option value="1-15">NEMA 1-15 (125V 15A) - Không nối đất cũ</option>
<option value="1-20">NEMA 1-20 (125V 20A) - Không nối đất cũ</option>
<option value="1-30">NEMA 1-30 (125V 30A) - Không nối đất cũ</option>
</optgroup>
<optgroup label="NEMA 2 - 250V 2-Wire (No Ground)">
<option value="2-15">NEMA 2-15 (250V 15A) - Kế Thừa 240V</option>
<option value="2-20">NEMA 2-20 (250V 20A) - Kế Thừa 240V</option>
<option value="2-30">NEMA 2-30 (250V 30A) - Kế Thừa 240V</option>
</optgroup>
<optgroup label="NEMA 5 - 125V 3-Wire (Grounded)">
<option selected="" value="5-15">NEMA 5-15 (125V 15A) - Tiêu chuẩn hộ gia đình</option>
<option value="5-20">NEMA 5-20 (125V 20A) - Bếp/phòng tắm</option>
<option value="5-30">NEMA 5-30 (125V 30A) - Dòng điện cao 125V</option>
<option value="5-50">NEMA 5-50 (125V 50A) - Thiết bị nặng</option>
</optgroup>
<optgroup label="NEMA 6 - 250V 3-Wire (Grounded)">
<option value="6-15">NEMA 6-15 (250V 15A) - Cửa Sổ AC</option>
<option value="6-20">NEMA 6-20 (250V 20A) - Thiết bị/ AC lớn</option>
<option value="6-30">NEMA 6-30 (250V 30A) - Thiết bị cửa hàng</option>
<option value="6-50">NEMA 6-50 (250V 50A) - Máy hàn</option>
</optgroup>
<optgroup label="NEMA 7 - 277V 3-Wire (Commercial)">
<option value="7-15">NEMA 7-15 (277V 15A) - Chiếu sáng thương mại</option>
<option value="7-20">NEMA 7-20 (277V 20A) - Chiếu sáng thương mại</option>
<option value="7-30">NEMA 7-30 (277V 30A) - Thương mại</option>
<option value="7-50">NEMA 7-50 (277V 50A) - Công nghiệp</option>
</optgroup>
<optgroup label="NEMA 10 - 125/250V 3-Wire (Legacy Split-Phase)">
<option value="10-20">NEMA 10-20 (125/250V 20A) - Cũ</option>
<option value="10-30">NEMA 10-30 (125/250V 30A) - Máy sấy cũ</option>
<option value="10-50">NEMA 10-50 (125/250V 50A) - Dòng cũ</option>
</optgroup>
<optgroup label="NEMA 11 - 250V 3-Wire (3-Phase Delta)">
<option value="11-15">NEMA 11-15 (250V 15A) - 3 pha tam giác</option>
<option value="11-20">NEMA 11-20 (250V 20A) - 3 pha tam giác</option>
<option value="11-30">NEMA 11-30 (250V 30A) - 3 pha tam giác</option>
<option value="11-50">NEMA 11-50 (250V 50A) - 3 pha tam giác</option>
</optgroup>
<optgroup label="NEMA 14 - 125/250V 4-Wire (Modern Split-Phase)">
<option value="14-15">NEMA 14-15 (125/250V 15A) - Thiết bị nhỏ</option>
<option value="14-20">NEMA 14-20 (125/250V 20A) - Thiết Bị</option>
<option value="14-30">NEMA 14-30 (125/250V 30A) - Máy sấy hiện đại</option>
<option value="14-50">NEMA 14-50 (125/250V 50A) - Phạm vi/EV</option>
<option value="14-60">NEMA 14-60 (125/250V 60A) - Thiết bị nặng</option>
</optgroup>
<optgroup label="NEMA 15 - 250V 4-Wire (3-Phase Delta + Ground)">
<option value="15-15">NEMA 15-15 (250V 15A) - 3 pha</option>
<option value="15-20">NEMA 15-20 (250V 20A) - 3 pha</option>
<option value="15-30">NEMA 15-30 (250V 30A) - 3 pha</option>
<option value="15-50">NEMA 15-50 (250V 50A) - 3 pha</option>
<option value="15-60">NEMA 15-60 (250V 60A) - 3 pha</option>
</optgroup>
<optgroup label="NEMA 18 - 120/208V 4-Wire (3-Phase Wye)">
<option value="18-15">NEMA 18-15 (120/208V 15A) - dòng điện 3 pha</option>
<option value="18-20">NEMA 18-20 (120/208V 20A) - dòng điện 3 pha</option>
<option value="18-30">NEMA 18-30 (120/208V 30A) - dòng điện 3 pha</option>
<option value="18-50">NEMA 18-50 (120/208V 50A) - dòng điện 3 pha</option>
<option value="18-60">NEMA 18-60 (120/208V 60A) - dòng điện 3 pha</option>
</optgroup>
<optgroup label="Locking L5 (125V 3-wire)">
<option value="L5-15">NEMA L5-15 (125V 15A) - Tải nhẹ</option>
<option value="L5-20">NEMA L5-20 (125V 20A) - Đa dụng</option>
<option value="L5-30">NEMA L5-30 (125V 30A) - Máy Phát Điện/RV</option>
<option value="L5-50">NEMA L5-50 (125V 50A) - Thiết bị nặng</option>
</optgroup>
<optgroup label="Locking L6 (250V 3-wire)">
<option value="L6-15">NEMA L6-15 (250V 15A) - Thiết bị nhỏ</option>
<option value="L6-20">NEMA L6-20 (250V 20A) - PDU Máy Chủ</option>
<option value="L6-30">NEMA L6-30 (250V 30A) - Công nghiệp</option>
<option value="L6-50">NEMA L6-50 (250V 50A) - Công nghiệp nặng</option>
</optgroup>
<optgroup label="Locking L7 (277V 3-wire)">
<option value="L7-15">NEMA L7-15 (277V 15A) - Chiếu sáng thương mại</option>
<option value="L7-20">NEMA L7-20 (277V 20A) - Chiếu sáng thương mại</option>
<option value="L7-30">NEMA L7-30 (277V 30A) - Thương mại</option>
<option value="L7-50">NEMA L7-50 (277V 50A) - Công nghiệp</option>
</optgroup>
<optgroup label="Locking L8 (480V 3-wire)">
<option value="L8-20">NEMA L8-20 (480V 20A) - Công nghiệp</option>
<option value="L8-30">NEMA L8-30 (480V 30A) - Công nghiệp</option>
</optgroup>
<optgroup label="Locking L9 (600V 3-wire)">
<option value="L9-20">NEMA L9-20 (600V 20A) - Công nghiệp nặng</option>
<option value="L9-30">NEMA L9-30 (600V 30A) - Công nghiệp nặng</option>
</optgroup>
<optgroup label="Locking L10 (125/250V 3-wire legacy)">
<option value="L10-20">NEMA L10-20 (125/250V 20A) - Di Sản</option>
<option value="L10-30">NEMA L10-30 (125/250V 30A) - Di Sản</option>
</optgroup>
<optgroup label="Locking L11 (250V 3φ Delta 3-wire)">
<option value="L11-15">NEMA L11-15 (250V 15A) - 3 pha không nối đất</option>
<option value="L11-20">NEMA L11-20 (250V 20A) - 3 pha không nối đất</option>
<option value="L11-30">NEMA L11-30 (250V 30A) - 3 pha không nối đất</option>
</optgroup>
<optgroup label="Locking L14 (125/250V 4-wire)">
<option value="L14-20">NEMA L14-20 (125/250V 20A) - Thiết bị chiếu sáng</option>
<option value="L14-30">NEMA L14-30 (125/250V 30A) - Chuyển máy phát điện</option>
<option value="L14-50">NEMA L14-50 (125/250V 50A) - Thiết bị nặng</option>
<option value="L14-60">NEMA L14-60 (125/250V 60A) - Công nghiệp</option>
</optgroup>
<optgroup label="Locking L15 (250V 3φ Delta 4-wire)">
<option value="L15-20">NEMA L15-20 (250V 20A) - 3 pha</option>
<option value="L15-30">NEMA L15-30 (250V 30A) - 3 pha</option>
<option value="L15-50">NEMA L15-50 (250V 50A) - 3 pha</option>
<option value="L15-60">NEMA L15-60 (250V 60A) - 3 pha</option>
</optgroup>
<optgroup label="Locking L16 (480V 3φ Delta 4-wire)">
<option value="L16-20">NEMA L16-20 (480V 20A) - Công nghiệp 3 pha</option>
<option value="L16-30">NEMA L16-30 (480V 30A) - Công nghiệp 3 pha</option>
</optgroup>
<optgroup label="Locking L17 (600V 3φ Delta 4-wire)">
<option value="L17-30">NEMA L17-30 (600V 30A) - Công nghiệp nặng 3 pha</option>
</optgroup>
<optgroup label="Locking L18 (120/208V 3φ Wye 4-wire)">
<option value="L18-20">NEMA L18-20 (120/208V 20A) - wye 3 pha không nối đất</option>
<option value="L18-30">NEMA L18-30 (120/208V 30A) - wye 3 pha không nối đất</option>
</optgroup>
<optgroup label="Locking L19 (277/480V 3φ Wye 4-wire)">
<option value="L19-20">NEMA L19-20 (277/480V 20A) - Thương mại 3 pha</option>
<option value="L19-30">NEMA L19-30 (277/480V 30A) - Thương mại 3 pha</option>
</optgroup>
<optgroup label="Locking L20 (347/600V 3φ Wye 4-wire)">
<option value="L20-20">NEMA L20-20 (347/600V 20A) - Công nghiệp 3 pha</option>
<option value="L20-30">NEMA L20-30 (347/600V 30A) - Công nghiệp 3 pha</option>
</optgroup>
<optgroup label="Locking L21 (120/208V 3φ Wye 5-wire)">
<option value="L21-20">NEMA L21-20 (120/208V 20A) - Trung tâm dữ liệu</option>
<option value="L21-30">NEMA L21-30 (120/208V 30A) - Trung tâm dữ liệu</option>
</optgroup>
<optgroup label="Locking L22 (277/480V 3φ Wye 5-wire)">
<option value="L22-20">NEMA L22-20 (277/480V 20A) - Thương mại 3 pha</option>
<option value="L22-30">NEMA L22-30 (277/480V 30A) - Thương mại 3 pha</option>
</optgroup>
<optgroup label="Locking L23 (347/600V 3φ Wye 5-wire)">
<option value="L23-20">NEMA L23-20 (347/600V 20A) - Công nghiệp 3 pha</option>
<option value="L23-30">NEMA L23-30 (347/600V 30A) - Công nghiệp 3 pha</option>
</optgroup>
<optgroup label="RV/Travel Trailer">
<option value="TT-30">NEMA TT-30 (125V 30A) - Công viên RV</option>
</optgroup>
</select>
</div>
</div>
</div>
<div class="visualization-grid">
<div class="connector-panel">
<div class="panel-header receptacle">Ổ Cắm (Ổ Cắm) - Nhìn Trực Diện</div>
<div class="panel-content">
<svg class="connector-svg" id="receptacleSvg" viewbox="0 0 220 220"></svg>
<div class="connector-label" id="receptacleLabel">Ổ cắm trên tường - khe cắm chấp nhận chân cắm</div>
</div>
</div>
<div class="connector-panel">
<div class="panel-header plug">Cắm (Nam) - Nhìn mặt</div>
<div class="panel-content">
<svg class="connector-svg" id="plugSvg" viewbox="0 0 220 220"></svg>
<div class="connector-label" id="plugLabel">Đầu dây - chân cắm vào ổ cắm</div>
</div>
</div>
</div>
<div class="wiring-section">
<div class="wiring-header">Sơ đồ nối dây</div>
<div class="wiring-content">
<div class="wiring-diagram">
<svg class="wiring-svg" id="wiringSvg" viewbox="0 0 600 180"></svg>
</div>
<div class="wire-legend" id="wireLegend">
<div class="wire-item">
<div class="wire-color hot"></div>
<span>Nóng (L1) - Đen</span>
</div>
<div class="wire-item">
<div class="wire-color neutral"></div>
<span>Trung tính - Trắng</span>
</div>
<div class="wire-item">
<div class="wire-color ground"></div>
<span>Mặt đất - Xanh/Trần</span>
</div>
</div>
</div>
</div>
<div class="specs-section">
<div class="specs-header">Thông số kỹ thuật điện</div>
<div class="specs-content">
<div class="specs-grid" id="specsGrid">
<div class="spec-card">
<div class="spec-value" id="specVoltage">125V</div>
<div class="spec-label">Điện áp</div>
</div>
<div class="spec-card">
<div class="spec-value" id="specAmperage">15A</div>
<div class="spec-label">Cường độ dòng điện</div>
</div>
<div class="spec-card">
<div class="spec-value" id="specWires">3</div>
<div class="spec-label">Dây dẫn</div>
</div>
<div class="spec-card">
<div class="spec-value" id="specAWG">14</div>
<div class="spec-label">AWG (Tiêu chuẩn)</div>
</div>
<div class="spec-card">
<div class="spec-value" id="specWattage">1.875W</div>
<div class="spec-label">Công suất tối đa</div>
</div>
</div>
<div class="uses-list" id="usesList">
<h4>Ứng dụng phổ biến:</h4>
<ul id="usesListItems">
<li>Ổ cắm gia dụng tiêu chuẩn</li>
<li>Phổ biến nhất ở Mỹ/Canada</li>
</ul>
</div>
<div class="connector-notes" id="connectorNotes" style="display: none;"></div>
<div class="awg-table-section">
<h4>Tham khảo máy đo dây AWG</h4>
<table class="awg-table">
<thead>
<tr>
<th>Cường độ dòng điện</th>
<th>Tiêu chuẩn (lên đến 50ft)</th>
<th>Mở rộng (50-100ft)</th>
</tr>
</thead>
<tbody id="awgTableBody">
<tr><td>15A</td><td>14 AWG</td><td>12 AWG</td></tr>
<tr><td>20A</td><td>12 AWG</td><td>10 AWG</td></tr>
<tr><td>30A</td><td>10 AWG</td><td>8 AWG</td></tr>
<tr><td>40A</td><td>8 AWG</td><td>6 AWG</td></tr>
<tr><td>50A</td><td>6 AWG</td><td>4 AWG</td></tr>
<tr><td>60A</td><td>4 AWG</td><td>2 AWG</td></tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="info-section">
<h3>Hiểu cách đặt tên trình kết nối NEMA</h3>
<p>Ký hiệu đầu nối NEMA tuân theo mẫu tiêu chuẩn cho biết cấu hình điện áp và định mức cường độ dòng điện.</p>
<table class="nema-code-table">
<thead>
<tr>
<th>Loạt</th>
<th>Điện áp</th>
<th>Dây điện</th>
<th>Sự miêu tả</th>
</tr>
</thead>
<tbody>
<tr><td>1</td><td>125V</td><td>2</td><td>Không có căn cứ (di sản)</td></tr>
<tr><td>2</td><td>250V</td><td>2</td><td>240V không nối đất (cũ)</td></tr>
<tr><td>5</td><td>125V</td><td>3</td><td>Nối đất - hộ gia đình tiêu chuẩn</td></tr>
<tr><td>6</td><td>250V</td><td>3</td><td>Nối đất 240V một pha</td></tr>
<tr><td>7</td><td>277V</td><td>3</td><td>Thương mại một pha</td></tr>
<tr><td>10</td><td>125/250V</td><td>3</td><td>Tách pha không nối đất (cũ)</td></tr>
<tr><td>11</td><td>250V</td><td>3</td><td>Delta 3 pha không nối đất</td></tr>
<tr><td>14</td><td>125/250V</td><td>4</td><td>Tách pha nối đất (hiện đại)</td></tr>
<tr><td>15</td><td>250V</td><td>4</td><td>Delta 3 pha nối đất</td></tr>
<tr><td>18</td><td>120/208V</td><td>4</td><td>dòng điện 3 pha</td></tr>
<tr><td>Tiền tố L</td><td>Nhiều</td><td>3-4</td><td>Đầu nối khóa (khóa xoắn)</td></tr>
</tbody>
</table>
<div class="info-grid">
<div class="info-card">
<h4>Cấu hình 125V (1, 5, L5)</h4>
<p>Điện áp tiêu chuẩn gia đình. Kết nối nóng với thiết bị đầu cuối bằng đồng, trung tính đến bạc, nối đất thành xanh lục.</p>
</div>
<div class="info-card">
<h4>Cấu hình 250V (2, 6, L6)</h4>
<p>Một pha 240V. Hai điểm nóng (không có điểm trung tính), thường được sử dụng cho các thiết bị như máy hàn và bộ AC lớn.</p>
</div>
<div class="info-card">
<h4>Cấu hình 125/250V (10, 14, L14)</h4>
<p>Chia pha 240V với trung tính. Cung cấp cả 120V và 240V. Được sử dụng cho phạm vi, máy sấy, bộ sạc EV.</p>
</div>
<div class="info-card">
<h4>3 pha (11, 15, 18)</h4>
<p>Sức mạnh công nghiệp và thương mại. Cấu hình Delta (11, 15) hoặc Wye (18) cho động cơ và thiết bị nặng.</p>
</div>
</div>
<div class="safety-note">
<h4>Nguyên tắc an toàn</h4>
<ul>
<li>Luôn tắt nguồn ở cầu dao trước khi làm việc với các kết nối điện</li>
<li>Sử dụng thước đo dây được đánh giá phù hợp cho cường độ dòng điện và chiều dài chạy</li>
<li>Không bao giờ sử dụng bộ chuyển đổi để buộc các đầu nối không tương thích lại với nhau</li>
<li>Mạch 240V và 3 pha chỉ nên được lắp đặt bởi thợ điện có trình độ</li>
<li>Kết nối mặt đất rất quan trọng cho sự an toàn - không bao giờ bỏ qua hoặc bỏ qua chúng</li>
<li>Dòng Nema 1, 2 và 10 (không nối đất) là dòng cũ - sử dụng các thiết bị tương đương nối đất cho các hệ thống lắp đặt mới</li>
</ul>
</div>
</div>
</div>
<script src="https://d3js.org/d3.v7.min.js"></script>
<script>
'use strict';

/**
 * NEMA Power Connector Visualizer v2.0
 * Pattern-based drawing system for comprehensive NEMA connector support
 */

// ============================================================================
// PATTERN DEFINITIONS
// ============================================================================

const PATTERNS = {
    // 2-wire patterns (no ground)
    TWO_WIRE_VERTICAL: 'two_wire_vertical',
    TWO_WIRE_HORIZONTAL: 'two_wire_horizontal',

    // 3-wire patterns
    THREE_WIRE_VERTICAL: 'three_wire_vertical',       // 5-series: vertical slots + U ground
    THREE_WIRE_HORIZONTAL: 'three_wire_horizontal',   // 6-series: horizontal slots + U ground
    THREE_WIRE_MIXED: 'three_wire_mixed',             // 6-20: vertical + horizontal + ground
    THREE_WIRE_ANGLED: 'three_wire_angled',           // 6-50: angled slots + U ground
    THREE_WIRE_CROWFOOT: 'three_wire_crowfoot',       // 10-series: angled + L neutral
    THREE_WIRE_TANDEM: 'three_wire_tandem',           // 7-series: tandem horizontal
    THREE_WIRE_DELTA: 'three_wire_delta',             // 11-series: 3-phase delta

    // 4-wire patterns
    FOUR_WIRE_SPLIT: 'four_wire_split',               // 14-series: angled + vertical neutral + U ground
    FOUR_WIRE_DELTA: 'four_wire_delta',               // 15-series: 3-phase delta + ground
    FOUR_WIRE_WYE: 'four_wire_wye',                   // 18-series: 3-phase wye

    // Special patterns
    T_SLOT: 't_slot',                                 // 5-20 receptacle
    LOCKING: 'locking',                               // L-series
    TT_RV: 'tt_rv'                                    // TT-30 RV
};

// ============================================================================
// AWG LOOKUP
// ============================================================================

const AWG_TABLE = {
    15: { standard: '14', long: '12' },
    20: { standard: '12', long: '10' },
    30: { standard: '10', long: '8' },
    40: { standard: '8', long: '6' },
    50: { standard: '6', long: '4' },
    60: { standard: '4', long: '2' }
};

// ============================================================================
// CONNECTOR DATA - Pattern-based definitions
// ============================================================================

const nemaConnectors = {
    // NEMA 1 Series - 125V 2-Wire (No Ground)
    "1-15": {
        name: "NEMA 1-15", voltage: "125V", amperage: 15, wires: 2,
        pattern: PATTERNS.TWO_WIRE_VERTICAL,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { hotWidth: 6, neutralWidth: 8, hotHeight: 24, neutralHeight: 28, spacing: 35 },
        uses: ["Legacy ungrounded outlets", "Older homes (pre-1960s)", "2-prong appliances"],
        notes: "LEGACY - No ground connection. Not recommended for new installations."
    },
    "1-20": {
        name: "NEMA 1-20", voltage: "125V", amperage: 20, wires: 2,
        pattern: PATTERNS.TWO_WIRE_VERTICAL,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { hotWidth: 7, neutralWidth: 9, hotHeight: 26, neutralHeight: 30, spacing: 38, tSlot: true },
        uses: ["Legacy 20A circuits", "Older commercial buildings"],
        notes: "LEGACY - No ground. T-slot neutral accepts 1-15P plugs."
    },
    "1-30": {
        name: "NEMA 1-30", voltage: "125V", amperage: 30, wires: 2,
        pattern: PATTERNS.TWO_WIRE_VERTICAL,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { hotWidth: 8, neutralWidth: 10, hotHeight: 28, neutralHeight: 32, spacing: 42 },
        uses: ["Legacy high-current 125V", "Very rare"],
        notes: "LEGACY - Extremely rare. No ground connection."
    },

    // NEMA 2 Series - 250V 2-Wire (No Ground)
    "2-15": {
        name: "NEMA 2-15", voltage: "250V", amperage: 15, wires: 2,
        pattern: PATTERNS.TWO_WIRE_HORIZONTAL,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" }
        ],
        slotConfig: { slotWidth: 8, slotHeight: 22, spacing: 35 },
        uses: ["Legacy 240V equipment", "Extremely rare"],
        notes: "LEGACY - No ground. Do not use for new installations."
    },
    "2-20": {
        name: "NEMA 2-20", voltage: "250V", amperage: 20, wires: 2,
        pattern: PATTERNS.TWO_WIRE_HORIZONTAL,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" }
        ],
        slotConfig: { slotWidth: 8, slotHeight: 24, spacing: 38 },
        uses: ["Legacy 240V 20A equipment"],
        notes: "LEGACY - No ground connection."
    },
    "2-30": {
        name: "NEMA 2-30", voltage: "250V", amperage: 30, wires: 2,
        pattern: PATTERNS.TWO_WIRE_HORIZONTAL,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" }
        ],
        slotConfig: { slotWidth: 9, slotHeight: 26, spacing: 42 },
        uses: ["Legacy 240V 30A equipment", "Very rare"],
        notes: "LEGACY - No ground. Extremely rare."
    },

    // NEMA 5 Series - 125V 3-Wire (Grounded) - Most Common
    "5-15": {
        name: "NEMA 5-15", voltage: "125V", amperage: 15, wires: 3,
        pattern: PATTERNS.THREE_WIRE_VERTICAL,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { hotWidth: 6, neutralWidth: 8, hotHeight: 24, neutralHeight: 28, spacing: 35, groundOffset: 50 },
        uses: ["Standard household outlet", "TVs, computers, lamps", "General purpose 15A"],
        notes: "The most common outlet in US/Canadian homes."
    },
    "5-20": {
        name: "NEMA 5-20", voltage: "125V", amperage: 20, wires: 3,
        pattern: PATTERNS.T_SLOT,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { hotWidth: 7, neutralWidth: 9, hotHeight: 26, neutralHeight: 30, spacing: 35, groundOffset: 50 },
        uses: ["Kitchen countertops", "Bathrooms", "Garages", "Higher-draw appliances"],
        notes: "T-slot neutral accepts both 5-15P and 5-20P plugs. Required in kitchens/bathrooms."
    },
    "5-30": {
        name: "NEMA 5-30", voltage: "125V", amperage: 30, wires: 3,
        pattern: PATTERNS.THREE_WIRE_VERTICAL,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { hotWidth: 8, neutralWidth: 10, hotHeight: 28, neutralHeight: 32, spacing: 40, groundOffset: 55 },
        uses: ["High-current 125V equipment", "Some industrial tools"],
        notes: "Less common - most 30A needs are 240V."
    },
    "5-50": {
        name: "NEMA 5-50", voltage: "125V", amperage: 50, wires: 3,
        pattern: PATTERNS.THREE_WIRE_VERTICAL,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { hotWidth: 10, neutralWidth: 12, hotHeight: 32, neutralHeight: 36, spacing: 45, groundOffset: 60 },
        uses: ["Very high-current 125V", "Specialized equipment"],
        notes: "Rare - most 50A applications use 240V."
    },

    // NEMA 6 Series - 250V 3-Wire (Grounded)
    "6-15": {
        name: "NEMA 6-15", voltage: "250V", amperage: 15, wires: 3,
        pattern: PATTERNS.THREE_WIRE_HORIZONTAL,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotWidth: 8, slotHeight: 22, spacing: 35, groundOffset: 45 },
        uses: ["Window air conditioners", "Small welders", "Power tools"],
        notes: "240V single-phase. No neutral - cannot provide 120V."
    },
    "6-20": {
        name: "NEMA 6-20", voltage: "250V", amperage: 20, wires: 3,
        pattern: PATTERNS.THREE_WIRE_MIXED,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { vertWidth: 8, vertHeight: 24, horizWidth: 8, horizHeight: 22, spacing: 35, groundOffset: 45 },
        uses: ["Large window AC", "Server rooms", "Commercial equipment"],
        notes: "One vertical, one horizontal hot blade."
    },
    "6-30": {
        name: "NEMA 6-30", voltage: "250V", amperage: 30, wires: 3,
        pattern: PATTERNS.THREE_WIRE_HORIZONTAL,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotWidth: 9, slotHeight: 26, spacing: 40, groundOffset: 50 },
        uses: ["Shop equipment", "Compressors", "Medium welders"],
        notes: "Common workshop 240V outlet."
    },
    "6-50": {
        name: "NEMA 6-50", voltage: "250V", amperage: 50, wires: 3,
        pattern: PATTERNS.THREE_WIRE_ANGLED,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 30, angle: 45, spacing: 40, groundOffset: 50 },
        uses: ["Electric welders", "Plasma cutters", "Large shop equipment"],
        notes: "Heavy-duty 240V. Also used for some EV chargers."
    },

    // NEMA 7 Series - 277V 3-Wire (Commercial Single-Phase)
    "7-15": {
        name: "NEMA 7-15", voltage: "277V", amperage: 15, wires: 3,
        pattern: PATTERNS.THREE_WIRE_TANDEM,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotWidth: 8, slotHeight: 22, spacing: 35, groundOffset: 45 },
        uses: ["Commercial lighting", "277V fluorescent fixtures"],
        notes: "277V is one leg of 480V 3-phase wye. Common in commercial buildings."
    },
    "7-20": {
        name: "NEMA 7-20", voltage: "277V", amperage: 20, wires: 3,
        pattern: PATTERNS.THREE_WIRE_TANDEM,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotWidth: 8, slotHeight: 24, spacing: 38, groundOffset: 48 },
        uses: ["Commercial lighting circuits", "277V equipment"],
        notes: "Higher capacity commercial lighting."
    },
    "7-30": {
        name: "NEMA 7-30", voltage: "277V", amperage: 30, wires: 3,
        pattern: PATTERNS.THREE_WIRE_TANDEM,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotWidth: 9, slotHeight: 26, spacing: 42, groundOffset: 52 },
        uses: ["Commercial/industrial 277V"],
        notes: "Higher current commercial applications."
    },
    "7-50": {
        name: "NEMA 7-50", voltage: "277V", amperage: 50, wires: 3,
        pattern: PATTERNS.THREE_WIRE_TANDEM,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotWidth: 10, slotHeight: 30, spacing: 48, groundOffset: 58 },
        uses: ["Industrial 277V equipment"],
        notes: "Heavy-duty commercial/industrial."
    },

    // NEMA 10 Series - 125/250V 3-Wire (Legacy Split-Phase, No Ground)
    "10-20": {
        name: "NEMA 10-20", voltage: "125/250V", amperage: 20, wires: 3,
        pattern: PATTERNS.THREE_WIRE_CROWFOOT,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slotLength: 24, angle: 45, spacing: 36, lSlotOffset: 25 },
        uses: ["Legacy small appliances", "Rare"],
        notes: "LEGACY - No ground (neutral doubles as ground). Replace with 14-20."
    },
    "10-30": {
        name: "NEMA 10-30", voltage: "125/250V", amperage: 30, wires: 3,
        pattern: PATTERNS.THREE_WIRE_CROWFOOT,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slotLength: 28, angle: 45, spacing: 40, lSlotOffset: 30 },
        uses: ["Legacy electric dryers (pre-1996)", "Older installations"],
        notes: "LEGACY - No ground. Replace with 14-30 when possible."
    },
    "10-50": {
        name: "NEMA 10-50", voltage: "125/250V", amperage: 50, wires: 3,
        pattern: PATTERNS.THREE_WIRE_CROWFOOT,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slotLength: 32, angle: 45, spacing: 45, lSlotOffset: 35 },
        uses: ["Legacy electric ranges (pre-1996)"],
        notes: "LEGACY - No ground. Replace with 14-50 when possible."
    },

    // NEMA 11 Series - 250V 3-Wire (3-Phase Delta, No Ground)
    "11-15": {
        name: "NEMA 11-15", voltage: "250V", amperage: 15, wires: 3,
        pattern: PATTERNS.THREE_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" }
        ],
        slotConfig: { slotLength: 22, radius: 30 },
        uses: ["3-phase motors", "Industrial equipment"],
        notes: "3-phase delta without ground. Use 15-series for grounded version."
    },
    "11-20": {
        name: "NEMA 11-20", voltage: "250V", amperage: 20, wires: 3,
        pattern: PATTERNS.THREE_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" }
        ],
        slotConfig: { slotLength: 24, radius: 32 },
        uses: ["3-phase equipment", "Small motors"],
        notes: "3-phase delta without ground."
    },
    "11-30": {
        name: "NEMA 11-30", voltage: "250V", amperage: 30, wires: 3,
        pattern: PATTERNS.THREE_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" }
        ],
        slotConfig: { slotLength: 26, radius: 35 },
        uses: ["3-phase motors", "Industrial machinery"],
        notes: "3-phase delta without ground."
    },
    "11-50": {
        name: "NEMA 11-50", voltage: "250V", amperage: 50, wires: 3,
        pattern: PATTERNS.THREE_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" }
        ],
        slotConfig: { slotLength: 30, radius: 38 },
        uses: ["Large 3-phase motors", "Heavy industrial"],
        notes: "3-phase delta without ground."
    },

    // NEMA 14 Series - 125/250V 4-Wire (Modern Split-Phase with Ground)
    "14-15": {
        name: "NEMA 14-15", voltage: "125/250V", amperage: 15, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_SPLIT,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 22, angle: 45, spacing: 32, neutralHeight: 24, groundOffset: 50 },
        uses: ["Small split-phase equipment"],
        notes: "Modern grounded split-phase for lower current applications."
    },
    "14-20": {
        name: "NEMA 14-20", voltage: "125/250V", amperage: 20, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_SPLIT,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 24, angle: 45, spacing: 34, neutralHeight: 26, groundOffset: 52 },
        uses: ["Equipment needing both 120V and 240V"],
        notes: "Modern replacement for 10-20."
    },
    "14-30": {
        name: "NEMA 14-30", voltage: "125/250V", amperage: 30, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_SPLIT,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 26, angle: 45, spacing: 35, neutralHeight: 28, groundOffset: 55 },
        uses: ["Modern electric dryers", "Level 2 EV charging", "Small welders"],
        notes: "Required for new dryer installations since 1996."
    },
    "14-50": {
        name: "NEMA 14-50", voltage: "125/250V", amperage: 50, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_SPLIT,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 30, angle: 45, spacing: 45, neutralHeight: 30, groundOffset: 55 },
        uses: ["Electric ranges/ovens", "Level 2 EV charging (Tesla)", "RV 50A", "Welders"],
        notes: "Most versatile high-power outlet. Standard for EV charging and ranges."
    },
    "14-60": {
        name: "NEMA 14-60", voltage: "125/250V", amperage: 60, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_SPLIT,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 32, angle: 45, spacing: 48, neutralHeight: 32, groundOffset: 58 },
        uses: ["Heavy equipment", "Large welders", "Industrial"],
        notes: "Maximum current in 14-series."
    },

    // NEMA 15 Series - 250V 4-Wire (3-Phase Delta with Ground)
    "15-15": {
        name: "NEMA 15-15", voltage: "250V", amperage: 15, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 20, radius: 28, groundRadius: 8 },
        uses: ["3-phase motors with ground"],
        notes: "Grounded version of 11-15."
    },
    "15-20": {
        name: "NEMA 15-20", voltage: "250V", amperage: 20, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 22, radius: 30, groundRadius: 8 },
        uses: ["3-phase equipment", "Motors"],
        notes: "Grounded 3-phase delta."
    },
    "15-30": {
        name: "NEMA 15-30", voltage: "250V", amperage: 30, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 24, radius: 33, groundRadius: 9 },
        uses: ["Industrial 3-phase", "Motor loads"],
        notes: "Common industrial 3-phase outlet."
    },
    "15-50": {
        name: "NEMA 15-50", voltage: "250V", amperage: 50, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 28, radius: 36, groundRadius: 10 },
        uses: ["Large 3-phase motors", "Industrial machinery"],
        notes: "Heavy-duty 3-phase delta."
    },
    "15-60": {
        name: "NEMA 15-60", voltage: "250V", amperage: 60, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_DELTA,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slotLength: 30, radius: 38, groundRadius: 11 },
        uses: ["Very large industrial loads"],
        notes: "Maximum 15-series amperage."
    },

    // NEMA 18 Series - 120/208V 4-Wire (3-Phase Wye)
    "18-15": {
        name: "NEMA 18-15", voltage: "120/208V", amperage: 15, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_WYE,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slotLength: 20, radius: 28, neutralRadius: 6 },
        uses: ["3-phase wye equipment", "Data centers"],
        notes: "3-phase wye provides 120V phase-to-neutral, 208V phase-to-phase."
    },
    "18-20": {
        name: "NEMA 18-20", voltage: "120/208V", amperage: 20, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_WYE,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slotLength: 22, radius: 30, neutralRadius: 7 },
        uses: ["Commercial equipment", "Server racks"],
        notes: "Common in commercial buildings."
    },
    "18-30": {
        name: "NEMA 18-30", voltage: "120/208V", amperage: 30, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_WYE,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slotLength: 24, radius: 33, neutralRadius: 8 },
        uses: ["Commercial 3-phase", "Industrial"],
        notes: "Higher current 3-phase wye."
    },
    "18-50": {
        name: "NEMA 18-50", voltage: "120/208V", amperage: 50, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_WYE,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slotLength: 28, radius: 36, neutralRadius: 9 },
        uses: ["Heavy commercial equipment"],
        notes: "High-current 3-phase wye."
    },
    "18-60": {
        name: "NEMA 18-60", voltage: "120/208V", amperage: 60, wires: 4,
        pattern: PATTERNS.FOUR_WIRE_WYE,
        terminals: [
            { id: "hot", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "hot3", label: "Phase Z", color: "#0000CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slotLength: 30, radius: 38, neutralRadius: 10 },
        uses: ["Industrial 3-phase wye"],
        notes: "Maximum 18-series amperage."
    },

    // Locking Connectors
    // =========================================================================
    // LOCKING L5 SERIES - 125V 3-Wire (Hot, Neutral, Ground)
    // =========================================================================
    "L5-15": {
        name: "NEMA L5-15", voltage: "125V", amperage: 15, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 30, slotLength: 18 },
        uses: ["Light-duty twist-lock", "Portable equipment", "Shop tools"],
        notes: "Smallest L5 connector. Twist-lock prevents accidental disconnection.",
        locking: true
    },
    "L5-20": {
        name: "NEMA L5-20", voltage: "125V", amperage: 20, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 32, slotLength: 20 },
        uses: ["General purpose twist-lock", "Construction sites", "Industrial 120V"],
        notes: "Common 20A locking connector for general industrial use.",
        locking: true
    },
    "L5-30": {
        name: "NEMA L5-30", voltage: "125V", amperage: 30, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 35, slotLength: 22 },
        uses: ["Portable generators", "RV parks (30A)", "Temporary power"],
        notes: "Very common generator outlet. Twist-lock prevents accidental disconnection.",
        locking: true
    },
    "L5-50": {
        name: "NEMA L5-50", voltage: "125V", amperage: 50, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 40, slotLength: 26 },
        uses: ["Heavy 125V equipment", "Large generators", "Industrial machinery"],
        notes: "Heavy-duty 125V locking connector for high-current applications.",
        locking: true
    },

    // =========================================================================
    // LOCKING L6 SERIES - 250V 3-Wire (Hot L1, Hot L2, Ground)
    // =========================================================================
    "L6-15": {
        name: "NEMA L6-15", voltage: "250V", amperage: 15, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 30, slotLength: 18 },
        uses: ["Small 240V equipment", "Window AC units", "Lab equipment"],
        notes: "Compact 250V locking connector for light-duty applications.",
        locking: true
    },
    "L6-20": {
        name: "NEMA L6-20", voltage: "250V", amperage: 20, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 32, slotLength: 20 },
        uses: ["Server room PDUs", "UPS systems", "Network equipment"],
        notes: "Very common in data centers. Often used for rack PDU connections.",
        locking: true
    },
    "L6-30": {
        name: "NEMA L6-30", voltage: "250V", amperage: 30, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 35, slotLength: 22 },
        uses: ["Data center PDUs", "Industrial equipment", "Welders"],
        notes: "Industrial twist-lock. Very common in server rooms and workshops.",
        locking: true
    },
    "L6-50": {
        name: "NEMA L6-50", voltage: "250V", amperage: 50, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 40, slotLength: 26 },
        uses: ["Heavy industrial equipment", "Large welders", "Industrial ovens"],
        notes: "Heavy-duty 250V locking connector for high-current industrial use.",
        locking: true
    },

    // =========================================================================
    // LOCKING L7 SERIES - 277V 3-Wire (Hot, Neutral, Ground)
    // =========================================================================
    "L7-15": {
        name: "NEMA L7-15", voltage: "277V", amperage: 15, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 30, slotLength: 18 },
        uses: ["Commercial lighting circuits", "277V building systems"],
        notes: "277V is common in commercial buildings for lighting efficiency.",
        locking: true
    },
    "L7-20": {
        name: "NEMA L7-20", voltage: "277V", amperage: 20, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 32, slotLength: 20 },
        uses: ["Commercial lighting", "HID ballasts", "Office buildings"],
        notes: "Standard commercial lighting circuit connector.",
        locking: true
    },
    "L7-30": {
        name: "NEMA L7-30", voltage: "277V", amperage: 30, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 35, slotLength: 22 },
        uses: ["High-power commercial lighting", "Industrial 277V equipment"],
        notes: "Higher amperage 277V locking connector.",
        locking: true
    },
    "L7-50": {
        name: "NEMA L7-50", voltage: "277V", amperage: 50, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 40, slotLength: 26 },
        uses: ["Industrial 277V equipment", "Large commercial installations"],
        notes: "Heavy-duty 277V locking connector for high-current applications.",
        locking: true
    },

    // =========================================================================
    // LOCKING L8 SERIES - 480V 3-Wire (Hot, Neutral, Ground)
    // =========================================================================
    "L8-20": {
        name: "NEMA L8-20", voltage: "480V", amperage: 20, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 32, slotLength: 20 },
        uses: ["Industrial 480V single-phase equipment", "Large motors"],
        notes: "480V single-phase locking connector. Common in industrial settings.",
        locking: true
    },
    "L8-30": {
        name: "NEMA L8-30", voltage: "480V", amperage: 30, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 35, slotLength: 22 },
        uses: ["Industrial equipment", "480V machinery", "Large compressors"],
        notes: "Higher amperage 480V single-phase locking connector.",
        locking: true
    },

    // =========================================================================
    // LOCKING L9 SERIES - 600V 3-Wire (Hot, Neutral, Ground)
    // =========================================================================
    "L9-20": {
        name: "NEMA L9-20", voltage: "600V", amperage: 20, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 32, slotLength: 20 },
        uses: ["Heavy industrial 600V equipment", "Mining equipment"],
        notes: "600V single-phase for heavy industrial applications. Primarily Canadian.",
        locking: true
    },
    "L9-30": {
        name: "NEMA L9-30", voltage: "600V", amperage: 30, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 3, radius: 35, slotLength: 22 },
        uses: ["Heavy industrial equipment", "Mining", "Oil & gas"],
        notes: "600V single-phase locking. Common in Canadian industrial facilities.",
        locking: true
    },

    // =========================================================================
    // LOCKING L10 SERIES - 125/250V 3-Wire (Hot L1, Hot L2, Neutral - NO GROUND)
    // =========================================================================
    "L10-20": {
        name: "NEMA L10-20", voltage: "125/250V", amperage: 20, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slots: 3, radius: 32, slotLength: 20 },
        uses: ["Legacy split-phase equipment", "Older industrial tools"],
        notes: "Legacy 3-wire split-phase WITHOUT ground. Use L14 series for new installations.",
        locking: true
    },
    "L10-30": {
        name: "NEMA L10-30", voltage: "125/250V", amperage: 30, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slots: 3, radius: 35, slotLength: 22 },
        uses: ["Legacy dryers", "Older equipment", "Industrial legacy"],
        notes: "Legacy split-phase locking WITHOUT ground. Superseded by L14-30.",
        locking: true
    },

    // =========================================================================
    // LOCKING L11 SERIES - 250V 3-Phase Delta 3-Wire (X, Y, Z - NO GROUND)
    // =========================================================================
    "L11-15": {
        name: "NEMA L11-15", voltage: "250V 3φ", amperage: 15, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" }
        ],
        slotConfig: { slots: 3, radius: 30, slotLength: 18 },
        uses: ["3-phase motors", "Legacy industrial equipment"],
        notes: "3-phase delta WITHOUT ground. Use L15 series for grounded applications.",
        locking: true
    },
    "L11-20": {
        name: "NEMA L11-20", voltage: "250V 3φ", amperage: 20, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" }
        ],
        slotConfig: { slots: 3, radius: 32, slotLength: 20 },
        uses: ["3-phase motors", "Industrial machinery", "Compressors"],
        notes: "3-phase delta locking WITHOUT ground wire.",
        locking: true
    },
    "L11-30": {
        name: "NEMA L11-30", voltage: "250V 3φ", amperage: 30, wires: 3,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" }
        ],
        slotConfig: { slots: 3, radius: 35, slotLength: 22 },
        uses: ["3-phase motors", "Industrial equipment", "Machine tools"],
        notes: "3-phase delta locking. No ground - use L15-30 for grounded circuits.",
        locking: true
    },

    // =========================================================================
    // LOCKING L14 SERIES - 125/250V Split-Phase 4-Wire
    // =========================================================================
    "L14-20": {
        name: "NEMA L14-20", voltage: "125/250V", amperage: 20, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 32, slotLength: 18 },
        uses: ["Small generators", "Light equipment", "Portable power"],
        notes: "Smaller version of L14-30 for lighter loads.",
        locking: true
    },
    "L14-30": {
        name: "NEMA L14-30", voltage: "125/250V", amperage: 30, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 35, slotLength: 20 },
        uses: ["Generator transfer switches", "Portable generators", "RV shore power"],
        notes: "Most common generator outlet. Provides both 120V and 240V.",
        locking: true
    },
    "L14-50": {
        name: "NEMA L14-50", voltage: "125/250V", amperage: 50, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 40, slotLength: 24 },
        uses: ["Large generators", "RV 50A shore power", "Heavy equipment"],
        notes: "Heavy-duty split-phase locking connector.",
        locking: true
    },
    "L14-60": {
        name: "NEMA L14-60", voltage: "125/250V", amperage: 60, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "hot", label: "Hot L1", color: "#000000", wireColor: "Black" },
            { id: "hot2", label: "Hot L2", color: "#CC0000", wireColor: "Red" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 42, slotLength: 26 },
        uses: ["Industrial equipment", "Large generators", "Heavy machinery"],
        notes: "Largest L14 connector for high-current split-phase applications.",
        locking: true
    },

    // =========================================================================
    // LOCKING L15 SERIES - 250V 3-Phase Delta 4-Wire (X, Y, Z, Ground)
    // =========================================================================
    "L15-20": {
        name: "NEMA L15-20", voltage: "250V 3φ", amperage: 20, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 32, slotLength: 18 },
        uses: ["3-phase motors", "Industrial equipment", "Machine tools"],
        notes: "3-phase delta configuration without neutral. 250V between phases.",
        locking: true
    },
    "L15-30": {
        name: "NEMA L15-30", voltage: "250V 3φ", amperage: 30, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 35, slotLength: 20 },
        uses: ["3-phase motors", "Compressors", "Industrial machinery"],
        notes: "Common 3-phase delta locking connector for industrial equipment.",
        locking: true
    },
    "L15-50": {
        name: "NEMA L15-50", voltage: "250V 3φ", amperage: 50, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 40, slotLength: 24 },
        uses: ["Large 3-phase motors", "Heavy industrial equipment"],
        notes: "Heavy-duty 3-phase delta locking connector.",
        locking: true
    },
    "L15-60": {
        name: "NEMA L15-60", voltage: "250V 3φ", amperage: 60, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 42, slotLength: 26 },
        uses: ["Heavy industrial 3-phase equipment", "Large motors"],
        notes: "Largest L15 connector for high-current 3-phase delta applications.",
        locking: true
    },

    // =========================================================================
    // LOCKING L16 SERIES - 480V 3-Phase Delta 4-Wire (X, Y, Z, Ground)
    // =========================================================================
    "L16-20": {
        name: "NEMA L16-20", voltage: "480V 3φ", amperage: 20, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 32, slotLength: 18 },
        uses: ["Industrial 3-phase 480V", "Large motors", "HVAC equipment"],
        notes: "480V 3-phase delta with ground. Common in US industrial facilities.",
        locking: true
    },
    "L16-30": {
        name: "NEMA L16-30", voltage: "480V 3φ", amperage: 30, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 35, slotLength: 20 },
        uses: ["Industrial equipment", "Large compressors", "Manufacturing"],
        notes: "480V 3-phase delta locking. Standard in many industrial plants.",
        locking: true
    },

    // =========================================================================
    // LOCKING L17 SERIES - 600V 3-Phase Delta 4-Wire (X, Y, Z, Ground)
    // =========================================================================
    "L17-30": {
        name: "NEMA L17-30", voltage: "600V 3φ", amperage: 30, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 4, radius: 35, slotLength: 20 },
        uses: ["Heavy industrial 3-phase", "Mining", "Oil & gas"],
        notes: "600V 3-phase delta. Common in Canadian industrial facilities.",
        locking: true
    },

    // =========================================================================
    // LOCKING L18 SERIES - 120/208V 3-Phase Wye 4-Wire (X, Y, Z, Neutral - NO GROUND)
    // =========================================================================
    "L18-20": {
        name: "NEMA L18-20", voltage: "120/208V 3φ", amperage: 20, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slots: 4, radius: 32, slotLength: 18 },
        uses: ["3-phase wye equipment", "Legacy commercial systems"],
        notes: "3-phase wye WITHOUT ground. Use L21 series for grounded circuits.",
        locking: true
    },
    "L18-30": {
        name: "NEMA L18-30", voltage: "120/208V 3φ", amperage: 30, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slots: 4, radius: 35, slotLength: 20 },
        uses: ["3-phase wye systems", "Commercial HVAC", "Industrial"],
        notes: "3-phase wye WITHOUT ground wire. L21-30 preferred for new work.",
        locking: true
    },

    // =========================================================================
    // LOCKING L19 SERIES - 277/480V 3-Phase Wye 4-Wire (X, Y, Z, Neutral - NO GROUND)
    // =========================================================================
    "L19-20": {
        name: "NEMA L19-20", voltage: "277/480V 3φ", amperage: 20, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slots: 4, radius: 32, slotLength: 18 },
        uses: ["Commercial 3-phase wye", "Large office buildings", "Industrial"],
        notes: "277/480V wye. 277V phase-to-neutral for lighting, 480V phase-to-phase.",
        locking: true
    },
    "L19-30": {
        name: "NEMA L19-30", voltage: "277/480V 3φ", amperage: 30, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slots: 4, radius: 35, slotLength: 20 },
        uses: ["Commercial buildings", "Industrial 480V wye systems"],
        notes: "277/480V wye WITHOUT ground. Use L22 for grounded applications.",
        locking: true
    },

    // =========================================================================
    // LOCKING L20 SERIES - 347/600V 3-Phase Wye 4-Wire (X, Y, Z, Neutral - NO GROUND)
    // =========================================================================
    "L20-20": {
        name: "NEMA L20-20", voltage: "347/600V 3φ", amperage: 20, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slots: 4, radius: 32, slotLength: 18 },
        uses: ["Canadian commercial systems", "Large industrial facilities"],
        notes: "347/600V wye. 347V lighting common in Canadian commercial buildings.",
        locking: true
    },
    "L20-30": {
        name: "NEMA L20-30", voltage: "347/600V 3φ", amperage: 30, wires: 4,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" }
        ],
        slotConfig: { slots: 4, radius: 35, slotLength: 20 },
        uses: ["Canadian industrial", "Heavy commercial equipment"],
        notes: "347/600V wye. Primary Canadian industrial distribution voltage.",
        locking: true
    },

    // =========================================================================
    // LOCKING L21 SERIES - 120/208V 3-Phase Wye 5-Wire (X, Y, Z, Neutral, Ground)
    // =========================================================================
    "L21-20": {
        name: "NEMA L21-20", voltage: "120/208V 3φ", amperage: 20, wires: 5,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 5, radius: 35, slotLength: 16 },
        uses: ["Data center PDUs", "Server room power", "Critical infrastructure"],
        notes: "3-phase wye with neutral. 120V phase-to-neutral, 208V phase-to-phase.",
        locking: true
    },
    "L21-30": {
        name: "NEMA L21-30", voltage: "120/208V 3φ", amperage: 30, wires: 5,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 5, radius: 38, slotLength: 18 },
        uses: ["Data center PDUs", "Large server racks", "Industrial 3-phase wye"],
        notes: "Very common in data centers. Provides both 120V and 208V 3-phase power.",
        locking: true
    },

    // =========================================================================
    // LOCKING L22 SERIES - 277/480V 3-Phase Wye 5-Wire (X, Y, Z, Neutral, Ground)
    // =========================================================================
    "L22-20": {
        name: "NEMA L22-20", voltage: "277/480V 3φ", amperage: 20, wires: 5,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 5, radius: 35, slotLength: 16 },
        uses: ["Commercial building power", "Industrial 480V wye", "Large HVAC"],
        notes: "277/480V wye with ground. 277V for lighting, 480V for motors.",
        locking: true
    },
    "L22-30": {
        name: "NEMA L22-30", voltage: "277/480V 3φ", amperage: 30, wires: 5,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 5, radius: 38, slotLength: 18 },
        uses: ["Commercial/industrial buildings", "Data centers (480V)", "Heavy equipment"],
        notes: "Full 5-wire 277/480V wye with ground for commercial/industrial use.",
        locking: true
    },

    // =========================================================================
    // LOCKING L23 SERIES - 347/600V 3-Phase Wye 5-Wire (X, Y, Z, Neutral, Ground)
    // =========================================================================
    "L23-20": {
        name: "NEMA L23-20", voltage: "347/600V 3φ", amperage: 20, wires: 5,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 5, radius: 35, slotLength: 16 },
        uses: ["Canadian industrial facilities", "Heavy commercial buildings"],
        notes: "347/600V wye with ground. Standard Canadian industrial voltage.",
        locking: true
    },
    "L23-30": {
        name: "NEMA L23-30", voltage: "347/600V 3φ", amperage: 30, wires: 5,
        pattern: PATTERNS.LOCKING,
        terminals: [
            { id: "x", label: "Phase X", color: "#000000", wireColor: "Black" },
            { id: "y", label: "Phase Y", color: "#CC0000", wireColor: "Red" },
            { id: "z", label: "Phase Z", color: "#0066CC", wireColor: "Blue" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { slots: 5, radius: 38, slotLength: 18 },
        uses: ["Canadian industrial", "Mining operations", "Heavy manufacturing"],
        notes: "Full 5-wire 347/600V wye. Primary Canadian heavy industrial connector.",
        locking: true
    },

    // RV Special
    "TT-30": {
        name: "NEMA TT-30", voltage: "125V", amperage: 30, wires: 3,
        pattern: PATTERNS.TT_RV,
        terminals: [
            { id: "hot", label: "Hot", color: "#000000", wireColor: "Black" },
            { id: "neutral", label: "Neutral", color: "#FFFFFF", wireColor: "White" },
            { id: "ground", label: "Ground", color: "#00AA00", wireColor: "Green/Bare" }
        ],
        slotConfig: { curveAngle: 30, spacing: 50, groundOffset: 55 },
        uses: ["RV parks", "Travel trailers", "Motorhomes"],
        notes: "TT = Travel Trailer. Standard 30A RV outlet. Not twist-lock despite curved slots."
    }
};

// ============================================================================
// PATTERN-BASED DRAWING ENGINE
// ============================================================================

function drawConnector(svg, connectorType, cx, cy, isReceptacle) {
    const connector = nemaConnectors[connectorType];
    if (!connector) return;

    const config = connector.slotConfig;

    switch (connector.pattern) {
        case PATTERNS.TWO_WIRE_VERTICAL:
            drawTwoWireVertical(svg, cx, cy, isReceptacle, config, connector);
            break;
        case PATTERNS.TWO_WIRE_HORIZONTAL:
            drawTwoWireHorizontal(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.THREE_WIRE_VERTICAL:
            drawThreeWireVertical(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.T_SLOT:
            drawTSlotPattern(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.THREE_WIRE_HORIZONTAL:
            drawThreeWireHorizontal(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.THREE_WIRE_MIXED:
            drawThreeWireMixed(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.THREE_WIRE_ANGLED:
            drawThreeWireAngled(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.THREE_WIRE_CROWFOOT:
            drawThreeWireCrowfoot(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.THREE_WIRE_TANDEM:
            drawThreeWireTandem(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.THREE_WIRE_DELTA:
            drawThreeWireDelta(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.FOUR_WIRE_SPLIT:
            drawFourWireSplit(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.FOUR_WIRE_DELTA:
            drawFourWireDelta(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.FOUR_WIRE_WYE:
            drawFourWireWye(svg, cx, cy, isReceptacle, config);
            break;
        case PATTERNS.LOCKING:
            drawLockingPattern(svg, cx, cy, isReceptacle, config, connector.terminals);
            break;
        case PATTERNS.TT_RV:
            drawTTPattern(svg, cx, cy, isReceptacle, config);
            break;
    }
}

// Pattern drawing functions

function drawTwoWireVertical(svg, cx, cy, isReceptacle, config, connector) {
    const w = isReceptacle ? 1 : 0.8;
    // Hot (narrower)
    drawSlot(svg, cx - config.spacing/2, cy, config.hotWidth * w, config.hotHeight, isReceptacle, 'vertical', 'Hot');
    // Neutral (wider) - may be T-slot
    if (config.tSlot && isReceptacle) {
        drawTSlot(svg, cx + config.spacing/2, cy, config.neutralWidth, config.neutralHeight, 'N');
    } else {
        drawSlot(svg, cx + config.spacing/2, cy, config.neutralWidth * w, config.neutralHeight, isReceptacle, 'vertical', 'N');
    }
}

function drawTwoWireHorizontal(svg, cx, cy, isReceptacle, config) {
    const w = isReceptacle ? 1 : 0.8;
    drawSlot(svg, cx - config.spacing/2, cy, config.slotWidth * w, config.slotHeight, isReceptacle, 'horizontal', 'L1');
    drawSlot(svg, cx + config.spacing/2, cy, config.slotWidth * w, config.slotHeight, isReceptacle, 'horizontal', 'L2');
}

function drawThreeWireVertical(svg, cx, cy, isReceptacle, config) {
    const w = isReceptacle ? 1 : 0.8;
    drawSlot(svg, cx - config.spacing/2, cy - 15, config.hotWidth * w, config.hotHeight, isReceptacle, 'vertical', 'Hot');
    drawSlot(svg, cx + config.spacing/2, cy - 15, config.neutralWidth * w, config.neutralHeight, isReceptacle, 'vertical', 'N');
    drawGroundPin(svg, cx, cy + config.groundOffset - 15, isReceptacle, 'G');
}

function drawTSlotPattern(svg, cx, cy, isReceptacle, config) {
    const w = isReceptacle ? 1 : 0.8;
    drawSlot(svg, cx - config.spacing/2, cy - 15, config.hotWidth * w, config.hotHeight, isReceptacle, 'vertical', 'Hot');
    if (isReceptacle) {
        drawTSlot(svg, cx + config.spacing/2, cy - 15, config.neutralWidth, config.neutralHeight, 'N');
    } else {
        drawSlot(svg, cx + config.spacing/2, cy - 10, config.neutralWidth * w, 20, isReceptacle, 'horizontal', 'N');
    }
    drawGroundPin(svg, cx, cy + config.groundOffset - 15, isReceptacle, 'G');
}

function drawThreeWireHorizontal(svg, cx, cy, isReceptacle, config) {
    const w = isReceptacle ? 1 : 0.8;
    drawSlot(svg, cx - config.spacing/2, cy - 10, config.slotWidth * w, config.slotHeight, isReceptacle, 'horizontal', 'L1');
    drawSlot(svg, cx + config.spacing/2, cy - 10, config.slotWidth * w, config.slotHeight, isReceptacle, 'horizontal', 'L2');
    drawGroundPin(svg, cx, cy + config.groundOffset - 10, isReceptacle, 'G');
}

function drawThreeWireMixed(svg, cx, cy, isReceptacle, config) {
    const w = isReceptacle ? 1 : 0.8;
    drawSlot(svg, cx - config.spacing/2, cy - 15, config.vertWidth * w, config.vertHeight, isReceptacle, 'vertical', 'L1');
    drawSlot(svg, cx + config.spacing/2, cy - 10, config.horizWidth * w, config.horizHeight, isReceptacle, 'horizontal', 'L2');
    drawGroundPin(svg, cx, cy + config.groundOffset - 10, isReceptacle, 'G');
}

function drawThreeWireAngled(svg, cx, cy, isReceptacle, config) {
    drawAngledSlot(svg, cx - config.spacing/2, cy - 10, config.slotLength, config.angle, isReceptacle, 'L1');
    drawAngledSlot(svg, cx + config.spacing/2, cy - 10, config.slotLength, -config.angle, isReceptacle, 'L2');
    drawLargeGroundPin(svg, cx, cy + config.groundOffset, isReceptacle, 'G');
}

function drawThreeWireCrowfoot(svg, cx, cy, isReceptacle, config) {
    drawAngledSlot(svg, cx - config.spacing/2, cy - 15, config.slotLength, config.angle, isReceptacle, 'L1');
    drawAngledSlot(svg, cx + config.spacing/2, cy - 15, config.slotLength, -config.angle, isReceptacle, 'L2');
    drawLSlot(svg, cx, cy + config.lSlotOffset, isReceptacle, 'N');
}

function drawThreeWireTandem(svg, cx, cy, isReceptacle, config) {
    const w = isReceptacle ? 1 : 0.8;
    // Tandem = side by side horizontal
    drawSlot(svg, cx - config.spacing/2, cy - 15, config.slotWidth * w, config.slotHeight, isReceptacle, 'horizontal', 'Hot');
    drawSlot(svg, cx + config.spacing/2, cy - 15, config.slotWidth * w, config.slotHeight, isReceptacle, 'horizontal', 'N');
    drawGroundPin(svg, cx, cy + config.groundOffset - 10, isReceptacle, 'G');
}

function drawThreeWireDelta(svg, cx, cy, isReceptacle, config) {
    // 3 slots in triangle pattern
    const angles = [90, 210, 330]; // degrees
    const labels = ['X', 'Y', 'Z'];
    angles.forEach((angle, i) => {
        const rad = angle * Math.PI / 180;
        const x = cx + config.radius * Math.cos(rad);
        const y = cy + config.radius * Math.sin(rad);
        drawAngledSlot(svg, x, y, config.slotLength, angle + 90, isReceptacle, labels[i]);
    });
}

function drawFourWireSplit(svg, cx, cy, isReceptacle, config) {
    // Angled hots at top, vertical neutral in middle, U-ground at bottom
    drawAngledSlot(svg, cx - config.spacing/2, cy - 20, config.slotLength, config.angle, isReceptacle, 'L1');
    drawAngledSlot(svg, cx + config.spacing/2, cy - 20, config.slotLength, -config.angle, isReceptacle, 'L2');
    drawSlot(svg, cx, cy + 15, isReceptacle ? 10 : 8, config.neutralHeight, isReceptacle, 'vertical', 'N');
    drawLargeGroundPin(svg, cx, cy + config.groundOffset, isReceptacle, 'G');
}

function drawFourWireDelta(svg, cx, cy, isReceptacle, config) {
    // 3 phase slots in triangle + center ground
    const angles = [90, 210, 330];
    const labels = ['X', 'Y', 'Z'];
    angles.forEach((angle, i) => {
        const rad = angle * Math.PI / 180;
        const x = cx + config.radius * Math.cos(rad);
        const y = cy + config.radius * Math.sin(rad);
        drawAngledSlot(svg, x, y, config.slotLength, angle + 90, isReceptacle, labels[i]);
    });
    // Center ground
    if (isReceptacle) {
        svg.append('circle').attr('cx', cx).attr('cy', cy).attr('r', config.groundRadius)
            .attr('fill', '#1a1a1a').attr('stroke', '#000').attr('stroke-width', 1);
    } else {
        svg.append('circle').attr('cx', cx).attr('cy', cy).attr('r', config.groundRadius)
            .attr('class', 'pin');
    }
    svg.append('text').attr('x', cx).attr('y', cy + config.groundRadius + 12)
        .attr('class', 'terminal-label').text('G');
}

function drawFourWireWye(svg, cx, cy, isReceptacle, config) {
    // 3 phase slots + center neutral (for wye)
    const angles = [90, 210, 330];
    const labels = ['X', 'Y', 'Z'];
    angles.forEach((angle, i) => {
        const rad = angle * Math.PI / 180;
        const x = cx + config.radius * Math.cos(rad);
        const y = cy + config.radius * Math.sin(rad);
        drawAngledSlot(svg, x, y, config.slotLength, angle + 90, isReceptacle, labels[i]);
    });
    // Center neutral
    if (isReceptacle) {
        svg.append('circle').attr('cx', cx).attr('cy', cy).attr('r', config.neutralRadius)
            .attr('fill', '#1a1a1a').attr('stroke', '#000').attr('stroke-width', 1);
    } else {
        svg.append('circle').attr('cx', cx).attr('cy', cy).attr('r', config.neutralRadius)
            .attr('fill', '#f0f0f0').attr('stroke', '#808080').attr('stroke-width', 1);
    }
    svg.append('text').attr('x', cx).attr('y', cy + config.neutralRadius + 12)
        .attr('class', 'terminal-label').text('N');
}

function drawLockingPattern(svg, cx, cy, isReceptacle, config, terminals) {
    // Locking ring
    svg.append('circle').attr('cx', cx).attr('cy', cy).attr('r', config.radius + 15)
        .attr('fill', 'none').attr('stroke', '#666').attr('stroke-width', 2)
        .attr('stroke-dasharray', '5,5');

    const labels = terminals.map(t => t.label.split(' ').pop());
    for (let i = 0; i < config.slots; i++) {
        const angle = (i * 360 / config.slots - 90) * Math.PI / 180;
        const x = cx + config.radius * Math.cos(angle);
        const y = cy + config.radius * Math.sin(angle);

        // Curved slot
        const startAngle = angle - 0.5;
        const endAngle = angle + 0.5;
        const startX = x + (config.slotLength/2) * Math.cos(startAngle);
        const startY = y + (config.slotLength/2) * Math.sin(startAngle);
        const endX = x + (config.slotLength/2) * Math.cos(endAngle);
        const endY = y + (config.slotLength/2) * Math.sin(endAngle);

        svg.append('path')
            .attr('d', `M ${startX} ${startY} A ${config.slotLength/2} ${config.slotLength/2} 0 0 1 ${endX} ${endY}`)
            .attr('fill', 'none')
            .attr('stroke', isReceptacle ? '#1a1a1a' : '#C0C0C0')
            .attr('stroke-width', isReceptacle ? 6 : 5)
            .attr('stroke-linecap', 'round');

        // Label
        const labelRadius = config.radius + 30;
        svg.append('text')
            .attr('x', cx + labelRadius * Math.cos(angle))
            .attr('y', cy + labelRadius * Math.sin(angle) + 4)
            .attr('class', 'terminal-label')
            .text(labels[i]);
    }

    // Center keyway
    svg.append('circle').attr('cx', cx).attr('cy', cy).attr('r', 8)
        .attr('fill', isReceptacle ? '#1a1a1a' : '#C0C0C0')
        .attr('stroke', '#333').attr('stroke-width', 1);
}

function drawTTPattern(svg, cx, cy, isReceptacle, config) {
    // TT-30 has curved (but not locking) slots
    const curveRad = config.curveAngle * Math.PI / 180;

    // Hot (left curved)
    drawCurvedSlot(svg, cx - 25, cy - 15, 26, isReceptacle, 'Hot', config.curveAngle);
    // Neutral (right curved)
    drawCurvedSlot(svg, cx + 25, cy - 15, 26, isReceptacle, 'N', -config.curveAngle);
    // Ground
    drawGroundPin(svg, cx, cy + 40, isReceptacle, 'G');
}

// ============================================================================
// PRIMITIVE DRAWING FUNCTIONS
// ============================================================================

function drawSlot(svg, x, y, width, height, isReceptacle, orientation, label) {
    const className = isReceptacle ? 'slot' : 'pin';
    if (orientation === 'vertical') {
        svg.append('rect')
            .attr('x', x - width/2).attr('y', y - height/2)
            .attr('width', width).attr('height', height)
            .attr('rx', isReceptacle ? 2 : 1).attr('class', className);
        svg.append('text').attr('x', x).attr('y', y - height/2 - 6)
            .attr('class', 'terminal-label').text(label);
    } else {
        svg.append('rect')
            .attr('x', x - height/2).attr('y', y - width/2)
            .attr('width', height).attr('height', width)
            .attr('rx', isReceptacle ? 2 : 1).attr('class', className);
        svg.append('text').attr('x', x).attr('y', y - width/2 - 6)
            .attr('class', 'terminal-label').text(label);
    }
}

function drawTSlot(svg, x, y, width, height, label) {
    const g = svg.append('g');
    g.append('rect').attr('x', x - 5).attr('y', y - height/2)
        .attr('width', 10).attr('height', height).attr('rx', 2).attr('class', 'slot');
    g.append('rect').attr('x', x - 15).attr('y', y - 5)
        .attr('width', 30).attr('height', 10).attr('rx', 2).attr('class', 'slot');
    svg.append('text').attr('x', x).attr('y', y - height/2 - 6)
        .attr('class', 'terminal-label').text(label);
}

function drawAngledSlot(svg, x, y, length, angle, isReceptacle, label) {
    const rad = angle * Math.PI / 180;
    const x1 = x - (length/2) * Math.cos(rad);
    const y1 = y - (length/2) * Math.sin(rad);
    const x2 = x + (length/2) * Math.cos(rad);
    const y2 = y + (length/2) * Math.sin(rad);

    svg.append('line')
        .attr('x1', x1).attr('y1', y1).attr('x2', x2).attr('y2', y2)
        .attr('stroke', isReceptacle ? '#1a1a1a' : '#C0C0C0')
        .attr('stroke-width', isReceptacle ? 8 : 6)
        .attr('stroke-linecap', 'round');

    svg.append('text').attr('x', x).attr('y', y - length/2 - 8)
        .attr('class', 'terminal-label').text(label);
}

function drawGroundPin(svg, x, y, isReceptacle, label) {
    if (isReceptacle) {
        svg.append('path')
            .attr('d', `M ${x-10} ${y-12} L ${x-10} ${y+5} Q ${x-10} ${y+12} ${x} ${y+12} Q ${x+10} ${y+12} ${x+10} ${y+5} L ${x+10} ${y-12}`)
            .attr('fill', 'none').attr('stroke', '#1a1a1a')
            .attr('stroke-width', 6).attr('stroke-linecap', 'round');
    } else {
        svg.append('circle').attr('cx', x).attr('cy', y).attr('r', 8).attr('class', 'pin');
    }
    svg.append('text').attr('x', x).attr('y', y + 25).attr('class', 'terminal-label').text(label);
}

function drawLargeGroundPin(svg, x, y, isReceptacle, label) {
    if (isReceptacle) {
        svg.append('path')
            .attr('d', `M ${x-15} ${y-15} L ${x-15} ${y+5} Q ${x-15} ${y+15} ${x} ${y+15} Q ${x+15} ${y+15} ${x+15} ${y+5} L ${x+15} ${y-15}`)
            .attr('fill', 'none').attr('stroke', '#1a1a1a')
            .attr('stroke-width', 8).attr('stroke-linecap', 'round');
    } else {
        svg.append('circle').attr('cx', x).attr('cy', y).attr('r', 10).attr('class', 'pin');
    }
    svg.append('text').attr('x', x).attr('y', y + 28).attr('class', 'terminal-label').text(label);
}

function drawLSlot(svg, x, y, isReceptacle, label) {
    const width = isReceptacle ? 6 : 5;
    svg.append('path')
        .attr('d', `M ${x-12} ${y} L ${x} ${y} L ${x} ${y+15}`)
        .attr('fill', 'none')
        .attr('stroke', isReceptacle ? '#1a1a1a' : '#C0C0C0')
        .attr('stroke-width', width).attr('stroke-linecap', 'round');
    svg.append('text').attr('x', x - 15).attr('y', y - 8).attr('class', 'terminal-label').text(label);
}

function drawCurvedSlot(svg, x, y, length, isReceptacle, label, curveAngle) {
    const rad = curveAngle * Math.PI / 180;
    const startX = x - length/2 * Math.sin(rad);
    const startY = y - length/2 * Math.cos(rad);
    const endX = x + length/2 * Math.sin(rad);
    const endY = y + length/2 * Math.cos(rad);

    svg.append('path')
        .attr('d', `M ${startX} ${startY} Q ${x} ${y - 5} ${endX} ${endY}`)
        .attr('fill', 'none')
        .attr('stroke', isReceptacle ? '#1a1a1a' : '#C0C0C0')
        .attr('stroke-width', isReceptacle ? 6 : 5).attr('stroke-linecap', 'round');
    svg.append('text').attr('x', x).attr('y', y - length/2 - 10).attr('class', 'terminal-label').text(label);
}

// ============================================================================
// MAIN DRAWING FUNCTIONS
// ============================================================================

function drawReceptacle(connectorType) {
    const svg = d3.select('#receptacleSvg');
    svg.selectAll('*').remove();

    const connector = nemaConnectors[connectorType];
    const cx = 110, cy = 110, radius = 90;

    svg.append('circle').attr('cx', cx).attr('cy', cy).attr('r', radius).attr('class', 'connector-face');
    drawConnector(svg, connectorType, cx, cy, true);
    svg.append('text').attr('x', cx).attr('y', cy + radius + 15)
        .attr('class', 'connector-type-label').text(connector.name + 'R');
}

function drawPlug(connectorType) {
    const svg = d3.select('#plugSvg');
    svg.selectAll('*').remove();

    const connector = nemaConnectors[connectorType];
    const cx = 110, cy = 110, radius = 90;

    svg.append('circle').attr('cx', cx).attr('cy', cy).attr('r', radius)
        .attr('fill', '#e0e0e0').attr('stroke', '#333').attr('stroke-width', 3);
    drawConnector(svg, connectorType, cx, cy, false);
    svg.append('text').attr('x', cx).attr('y', cy + radius + 15)
        .attr('class', 'connector-type-label').text(connector.name + 'P');
}

function drawWiringDiagram(connectorType) {
    const svg = d3.select('#wiringSvg');
    svg.selectAll('*').remove();

    const connector = nemaConnectors[connectorType];
    const terminals = connector.terminals;

    // Cable sheath
    svg.append('rect').attr('x', 50).attr('y', 70).attr('width', 200).attr('height', 40)
        .attr('rx', 8).attr('fill', '#666').attr('stroke', '#333').attr('stroke-width', 2);

    // Terminal block
    svg.append('rect').attr('x', 400).attr('y', 30).attr('width', 150).attr('height', 120)
        .attr('rx', 6).attr('fill', '#f5f5f5').attr('stroke', '#333').attr('stroke-width', 2);
    svg.append('text').attr('x', 475).attr('y', 25).attr('text-anchor', 'middle')
        .attr('font-size', '12px').attr('font-weight', 'bold').attr('fill', '#333').text('Terminal Block');

    const terminalSpacing = 100 / (terminals.length + 1);

    terminals.forEach((terminal, i) => {
        const termY = 50 + (i + 1) * terminalSpacing + 10;

        let wireClass = 'wire-hot';
        if (terminal.id === 'neutral') wireClass = 'wire-neutral';
        else if (terminal.id === 'ground') wireClass = 'wire-ground';
        else if (terminal.id === 'hot2' || terminal.id === 'y') wireClass = 'wire-hot2';
        else if (terminal.id === 'hot3' || terminal.id === 'z') wireClass = 'wire-hot3';

        svg.append('path').attr('d', `M 250 90 C 300 90, 350 ${termY}, 400 ${termY}`)
            .attr('class', `wire-line ${wireClass}`);

        svg.append('circle').attr('cx', 420).attr('cy', termY).attr('r', 10)
            .attr('class', 'terminal-circle')
            .attr('fill', terminal.color === '#FFFFFF' ? '#f0f0f0' : terminal.color);

        svg.append('text').attr('x', 480).attr('y', termY + 4)
            .attr('font-size', '11px').attr('fill', '#333')
            .text(`${terminal.label} (${terminal.wireColor})`);
    });

    svg.append('text').attr('x', 150).attr('y', 130).attr('text-anchor', 'middle')
        .attr('font-size', '11px').attr('fill', '#999').text(`${connector.wires}-conductor cable`);

    updateWireLegend(connector);
}

function updateWireLegend(connector) {
    const legend = document.getElementById('wireLegend');
    legend.innerHTML = connector.terminals.map(terminal => {
        let colorClass = 'hot';
        if (terminal.id === 'neutral') colorClass = 'neutral';
        else if (terminal.id === 'ground') colorClass = 'ground';
        else if (terminal.id === 'hot2' || terminal.id === 'y') colorClass = 'hot2';
        else if (terminal.id === 'hot3' || terminal.id === 'z') colorClass = 'hot3';
        return `<div class="wire-item"><div class="wire-color ${colorClass}"></div><span>${terminal.label} - ${terminal.wireColor}</span></div>`;
    }).join('');
}

function updateSpecs(connectorType) {
    const connector = nemaConnectors[connectorType];
    const awg = AWG_TABLE[connector.amperage] || { standard: '-', long: '-' };

    document.getElementById('specVoltage').textContent = connector.voltage;
    document.getElementById('specAmperage').textContent = connector.amperage + 'A';
    document.getElementById('specWires').textContent = connector.wires;
    document.getElementById('specAWG').textContent = awg.standard;

    // Calculate wattage
    let wattage;
    if (connector.voltage.includes('/')) {
        const volts = parseInt(connector.voltage.split('/')[1]);
        wattage = volts * connector.amperage;
    } else {
        wattage = parseInt(connector.voltage) * connector.amperage;
    }
    document.getElementById('specWattage').textContent = wattage.toLocaleString() + 'W';

    document.getElementById('usesListItems').innerHTML = connector.uses.map(u => `<li>${u}</li>`).join('');

    const notesEl = document.getElementById('connectorNotes');
    if (connector.notes) {
        notesEl.textContent = connector.notes;
        notesEl.style.display = 'block';
    } else {
        notesEl.style.display = 'none';
    }

    // Highlight AWG row
    document.querySelectorAll('#awgTableBody tr').forEach(row => {
        row.classList.remove('highlight');
        if (parseInt(row.cells[0].textContent) === connector.amperage) {
            row.classList.add('highlight');
        }
    });
}

function onConnectorChange() {
    const connectorType = document.getElementById('connectorType').value;
    drawReceptacle(connectorType);
    drawPlug(connectorType);
    drawWiringDiagram(connectorType);
    updateSpecs(connectorType);
}

document.addEventListener('DOMContentLoaded', function() {
    console.log('NEMA Connector Visualizer v2.0 - Pattern-based system loaded');
    console.log(`Total connectors: ${Object.keys(nemaConnectors).length}`);
    document.getElementById('connectorType').addEventListener('change', onConnectorChange);
    onConnectorChange();
});
</script>