Chapter 9 Table 4 — Conduit Dimensions

Dimensions and Percent Area of Conduit and Tubing

Trade Size Nominal Internal Diameter Total Area
100%
60% 1 Wire
53%
2 Wires
31%
Over 2 Wires
40%
mm in. mm2 in.2 mm2 in.2 mm2 in.2 mm2 in.2 mm2 in.2
½15.80.6221960.3041180.1821040.161610.094780.122
¾20.90.8243430.5332060.3201820.2821060.1651370.213
126.61.0495560.8643340.5182950.4581720.2682220.346
1 ¼35.11.3809681.4965810.8985130.7933000.4643870.598
1 ½40.91.6101,3142.0367881.2226961.0794070.6315260.814
252.52.0672,1653.3561,2992.0141,1471.7796711.0408661.342
2 ½69.42.7313,7835.8582,2703.5152,0053.1051,1731.8161,5132.343
385.23.3565,7018.8463,4215.3083,0224.6881,7672.7422,2803.538
3 ½97.43.8347,45111.5454,4716.9273,9496.1192,3103.5792,9804.618
4110.14.3349,52114.7535,7138.8525,0467.8192,9524.5733,8085.901

DISCLAIMER: All tables on this site are based on the 2011 National Electric Code. The law under your local jurisdiction may be different than what is presented here. Check your local jurisdiction's laws before attempting to do electrical work.

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