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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.
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.
The following is a typical conduit fill chart, which shows data for different types of conduit such as EMT conduit, IMC conduit, and GRC conduit. The possible wire gauges go from 14 AWG to 750 MCM, and from conduit trade sizes of 1/2 inches to 4 inches.
This PVC conduit fill table is used to determine how many THWN or THHN wires can be safely put into PVC conduit tubing. Each row going across is a different size of PVC conduit (Schedule 40 or 80). Each column (going up and down) is a different gauge of wire.
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 ...
Chapman Electric offers a selection of pipe and conduit to meet your electrical or underground project needs. The NEC sets standards for the percent of volume that can safely be put into conduit. The below chart is from Table 1 in Chapter 9 of the National Electric Code.
Our online tool helps electricians, engineers and contractors calculate the right size conduit, fill percentages and jam probability per NEC guidelines.
Calculating conduit fill is a straightforward process, but important to comply with NEC requirements (National Electrical Code) and avoid expensive rewiring (and most importantly, to keep your electrical installation safe!).
Our NEC Conduit Fill Chart for Liquid Tight Conduit calculates THWN and THHN wire fill for Liquidtight Flex Conduit pipe (LFNC-A, LFNC-B, LFNC-C and LFMC) using conduit trade size and AWG or MCM wire size.
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.