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The app will calculate the conduit fill percentages and jam probability for multiple conductors per NEC® Guidelines. Simply enter the conduit type and size, then specify your conductors.
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Our NEC Conduit Fill Chart calculates THWN and THHN wire fill for EMT, IMT, rigid metal, or flexible metal conduit pipe using conduit trade size and AWG or MCM wire size.
3/4 EMT 22 16 10 6 4 2 1 1 1 1 1 1 1 RMC 22 16 10 6 4 2 1 1 1 1 1 1 1 ... Conduit Fill Tables – NEC Table C Conductor Size – Awg / Kcmil – THHN / THWN SIZE 14 12 10 8 6 4 3 2 1 1/0 2/0 3/0 4/0 250 300 350 400 500 600 750 2 ½ EMT 241 176 111 64 46 28 24 20 15 12 10 8 7 6 5 4 4 3 2 1 RMC 200 146 92 53 38 23 20 17 12 10 8 7 6 5 4 3 3 2 1 1 ...
This online conduit fill calculator is compatible with the US National Electrical Code (NEC)! Step One: Select a conduit type and size. Step Two: Enter the insulation type, wire gauge, and amount of wires. Insulation. Gauge. Amount: Add another row. Calculate. Results. Total wire area (mm 2): Conduit area (mm 2): Conduit fill (%):
Step 1: Locate “1-inch EMT” in the chart. Step 2: Look under the column for “12 AWG THHN.”. Step 3: Check the maximum number of wires allowed. For a 40% fill, the chart may show that a 1-inch EMT conduit can hold up to nine 12 AWG THHN wires, meaning that your planned installation of four wires is within safe limits. 7.
CONDUIT FILL CALCULATOR for THHN & XHHW Raceway Fill Percentages as per NEC SIZE 40% Fill – Over 2 Wires 60% Fill – Nipple EMT GRC IMC PVC40 PVC80 FLEX ST EMT GRC IMC PVC40 PVC80 FLEX ST 1/2 0.122 0.125 0.137 0.114 0.087 0.127 0.125 .182 .188 .205 .171 .130 .190 .188
The ratio can be used to determine appropriate conduit size or determine how many cables can be placed in an existing conduit. The maximum recommended ratio can be affected by several factors, including application type, number of cables in the conduit, and the number of conduit bends.
