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  1. 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.

    • PVC Conduit Fill Chart

      Flexible Metallic Conduit -- Table C.3, our Conduit Fill...

    • Emt34

      Conduit Manufacturer's Part Number EMT34 Description 3/4"...

    • Emt4 Conduit 4

      Quick Specs Catalog Number EMT4 Vendor Code CON Manufacturer...

    • Gal3

      Quick Specs Catalog Number GAL3 Vendor Code CON Manufacturer...

  2. 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 ...

  3. 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.

  4. We have made this determination easy, with a convenient chart (Maximum Wire Fill Comparison | AppletonTM and O-Z/GedneyTM Conduit Bodies) that lists available conduit bodies by trade size and style and shows the maximum XHHW wire size that can be used in a three-conductor fill of wire.

  5. Conduit Fill Tables – NEC Table C Conductor Size – Awg / Kcmil – XHHW 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 40½ EMT 168 129 96 53 39 28 24 20 15 13 10 9 7 6 5 4 3 2 1 RMC 140 107 80 44 33 24 20 17 12 10 9 7 6 5 4 3 2 1 IMC 147 113 84 47 35 25 21 18 13 11 9 7 6 5 4 3 2 1 135 103 77 43 32 23 19 16 12 10 8 7 6 5 4 3 2 1

  6. 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.

  7. The results are the numbers of wires of that gauge, that can be run through that size, of that kind of conduit such as EMT, IMC, and galvanized pipe. This chart is based on the 2017 NEC code. Trade Size in Inches

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