Cable Current Rating Calculator ((free)) [TRUSTED]

Would you like a one-page PDF checklist of these steps?

// Voltage Drop mV/A/m values (Approximate for Copper, adjusted for Al) const voltDropData = "Cu": [0, 29, 18, 11, 7.3, 4.4, 2.9, 1.9, 1.35, 0.98, 0.72, 0.58, 0.48, 0.39, 0.32], "Al": [0, 0, 0, 0, 0, 0, 1.9, 1.25, 0.9, 0.65, 0.48, 0.39, 0.32, 0.26, 0.21] ;

| Conductor size (mm²) | Free air (A) | In conduit/wall (A) | Typical use | |----------------------|--------------|---------------------|--------------| | 1.5 | 22 | 15 | Lighting | | 2.5 | 30 | 21 | Socket rings | | 4 | 40 | 28 | Small appliances | | 6 | 51 | 36 | Showers, cookers | | 10 | 70 | 50 | Sub-mains | | 16 | 94 | 68 | Large circuits | | 25 | 120 | 89 | Feeders | | 35 | 148 | 110 | Industrial |

where k ≈ 13–16 depending on insulation. cable current rating calculator

return "> 240mm² (Requires Parallel Cables)";

.grid display: grid; grid-template-columns: 1fr 1fr; gap: 20px;

Enter the total power (Watts or Kilowatts) and the voltage of the system. Would you like a one-page PDF checklist of these steps

// Total Derating Factor let totalDerating = tempFactor * groupFactor * methodFactor;

// Map size to index for volt drop // Note: Simplification: Using same index or finding closest match // Sizes array for mapping: [1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240] const sizes = [1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240]; let vIndex = sizes.indexOf(selectedSize);

label display: block; margin-bottom: 5px; font-weight: 600; color: #555; // Total Derating Factor let totalDerating = tempFactor

const cableData = "Cu_PVC": [ [1.5, 19.5], [2.5, 27], [4, 37], [6, 47], [10, 65], [16, 88], [25, 117], [35, 145], [50, 179], [70, 233], [95, 283], [120, 330], [150, 380], [185, 440], [240, 530] ], "Cu_XLPE": [ [1.5, 25], [2.5, 34], [4, 46], [6, 59], [10, 81], [16, 110], [25, 145], [35, 180], [50, 220], [70, 280], [95, 340], [120, 400], [150, 460], [185, 530], [240, 640] ], "Al_PVC": [ [16, 68], [25, 91], [35, 114], [50, 140], [70, 183], [95, 225], [120, 265], [150, 305], [185, 355], [240, 430] ], "Al_XLPE": [ [16, 86], [25, 114], [35, 142], [50, 175], [70, 225], [95, 275], [120, 325], [150, 375], [185, 435], [240, 520] ] ;

❌ → Ampacity may be fine, but voltage drop might fail (e.g., >3% for lighting).

<div class="input-group"> <label for="grouping">Number of Circuits (Grouping)</label> <select id="grouping"> <option value="1">1 Circuit (No Derating)</option> <option value="2">2 Circuits</option> <option value="3">3 Circuits</option> <option value="4">4 Circuits</option> <option value="5">5 Circuits</option> <option value="6">6+ Circuits</option> </select> </div> </div> </div>