Electrical Conduit Size Calculator Work ✦ Verified Source

const tradeSizes = ["1/2", "3/4", "1", "1 1/4", "1 1/2", "2", "2 1/2", "3", "3 1/2", "4"];

function renderWireInputs() const container = document.getElementById('wiresContainer'); if (!container) return; container.innerHTML = ''; wires.forEach((wire, idx) => const div = document.createElement('div'); div.className = 'wire-entry'; div.innerHTML = ` <div class="wire-header"> <span>🔌 Conductor #$idx+1</span> <button class="btn-remove" data-idx="$idx" type="button">Remove</button> </div> <div class="wire-controls"> <select class="wire-size" data-idx="$idx"> $Object.keys(wireAreas).map(sz => `<option value="$sz" $wire.size === sz ? 'selected' : ''>AWG $sz</option>`).join('') </select> <select class="wire-insulation" data-idx="$idx"> <option value="THHN" $wire.insulation === 'THHN' ? 'selected' : ''>THHN / THWN</option> <option value="XHHW" $wire.insulation === 'XHHW' ? 'selected' : ''>XHHW</option> </select> </div> `; container.appendChild(div); ); // attach remove events document.querySelectorAll('.btn-remove').forEach(btn => btn.addEventListener('click', (e) => const idx = parseInt(btn.getAttribute('data-idx')); wires.splice(idx, 1); renderWireInputs(); ); ); // attach change listeners for dynamic updates document.querySelectorAll('.wire-size').forEach(sel => sel.addEventListener('change', (e) => const idx = parseInt(sel.getAttribute('data-idx')); wires[idx].size = sel.value; ); ); document.querySelectorAll('.wire-insulation').forEach(sel => sel.addEventListener('change', (e) => const idx = parseInt(sel.getAttribute('data-idx')); wires[idx].insulation = sel.value; ); );

function addWire() wires.push( size: "12", insulation: "THHN" ); renderWireInputs(); electrical conduit size calculator

function calculateConduit() if (wires.length === 0) document.getElementById('resultArea').innerHTML = `<div class="conduit-size-result" style="background:#f1f5f9;">⚠️ No wires added</div>`; document.getElementById('fillDetails').innerHTML = ''; return; const conduitType = document.getElementById('conduitType').value; let sparePercent = parseFloat(document.getElementById('sparePercent').value); if (isNaN(sparePercent)) sparePercent = 0; const totalWireArea = computeTotalArea(); const numWires = wires.length; const fillLimit = getFillPercentLimit(numWires); const requiredArea = totalWireArea / fillLimit; const spareMultiplier = 1 + (sparePercent / 100); const finalRequiredArea = requiredArea * spareMultiplier; const areaMap = conduitAreas[conduitType]; if (!areaMap) document.getElementById('resultArea').innerHTML = `<div class="conduit-size-result">Error: conduit data</div>`; return; let selectedSize = null; for (let sz of tradeSizes) if (areaMap[sz] >= finalRequiredArea) selectedSize = sz; break; const fillPercentActual = (totalWireArea / (selectedSize ? areaMap[selectedSize] : 0.01)) * 100; const fillPercentLimited = fillLimit * 100; const resultDiv = document.getElementById('resultArea'); const fillDetailsDiv = document.getElementById('fillDetails'); const warningDiv = document.getElementById('warningMsg'); if (selectedSize) Required area with spare: $finalRequiredArea.toFixed(4) in²</div> <div>🔢 Number of conductors: $numWires</div> `; if (fillPercentActual > fillLimit*100 + 0.5) warningDiv.style.display = 'block'; warningDiv.innerHTML = `⚠️ Warning: Actual fill ($fillPercentActual.toFixed(1)%) exceeds NEC $fillLimit*100% limit. Choose larger conduit.`; else warningDiv.style.display = 'none'; else resultDiv.innerHTML = `<div class="conduit-size-result" style="background:#ffe6e5; color:#a1301a;">❌ No standard conduit size up to 4" fits these wires.<br>Consider larger conduit or reducing wires.</div>`; fillDetailsDiv.innerHTML = `<div>Total area needed: $finalRequiredArea.toFixed(4) in² exceeds max 4" conduit area ($)</div>`; warningDiv.style.display = 'none'; const tradeSizes = ["1/2", "3/4", "1", "1 1/4",

// Conduit internal areas (sq in) - based on NEC Table 4 for EMT, PVC40, RMC, IMC (approx values for typical sizes) const conduitAreas = "EMT": "1/2": 0.213, "3/4": 0.346, "1": 0.598, "1 1/4": 0.984, "1 1/2": 1.342, "2": 2.028, "2 1/2": 2.731, "3": 3.916, "3 1/2": 5.027, "4": 6.388 , "PVC": "1/2": 0.201, "3/4": 0.333, "1": 0.577, "1 1/4": 0.954, "1 1/2": 1.295, "2": 1.947, "2 1/2": 2.621, "3": 3.760, "3 1/2": 4.824, "4": 6.128 , "RIGID": "1/2": 0.215, "3/4": 0.347, "1": 0.602, "1 1/4": 0.990, "1 1/2": 1.350, "2": 2.038, "2 1/2": 2.743, "3": 3.930, "3 1/2": 5.043, "4": 6.405 , "IMC": "1/2": 0.214, "3/4": 0.348, "1": 0.603, "1 1/4": 0.985, "1 1/2": 1.342, "2": 2.040, "2 1/2": 2.734, "3": 3.922, "3 1/2": 5.030, "4": 6.390 ;

<hr> <h3>📘 Conduit Fill Reference Table (for common wires)</h3> <div style="overflow-x:auto;"> <table> <thead> <tr><th>Wire Size (AWG/kcmil)</th><th>THHN/THWN Area (in²)</th><th>XHHW Area (in²)</th><th>Trade Size 3/4" EMT (40% fill max area)</th></tr> </thead> <tbody> <tr><td>14 AWG</td><td>0.0097</td><td>0.0123</td><td>0.213 in²</td></tr> <tr><td>12 AWG</td><td>0.0133</td><td>0.0160</td><td>0.213 in²</td></tr> <tr><td>10 AWG</td><td>0.0211</td><td>0.0243</td><td>0.213 in²</td></tr> <tr><td>8 AWG</td><td>0.0366</td><td>0.0410</td><td>0.213 in²</td></tr> <tr><td>6 AWG</td><td>0.0507</td><td>0.0590</td><td>0.346 in² (1" EMT)</td></tr> <tr><td>4 AWG</td><td>0.0824</td><td>0.0937</td><td>0.598 in² (1¼" EMT)</td></tr> </tbody> </table> <p class="note" style="margin-top:8px;">⚠️ Full NEC Chapter 9 Table 4 & 5 used in calculator logic for 1/2" to 4" conduit.</p> </div> </div> 'selected' : ''&gt

function getFillPercentLimit(numWires) if (numWires === 1) return 0.53; if (numWires === 2) return 0.31; return 0.40; // 3+ wires