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Rigid Metal Conduit

Rigid Metal Conduit (RMC) provides physical protection for cables and conductors and helps cable inside safely from mechanical damage. The table below of Rigid Table Conduit is in line with NEC.

RIGID METAL CONDUIT (RMC) CONDUIT
Metric Designation Trade Size 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
16½16.10.6322040.3141220.1881080.166630.097820.126
21¾21.20.8363530.5492120.3291870.2911090.1701410.220
27127.01.0635730.8873440.5323040.4701780.2752290.355
351 ¼35.41.3949841.5265900.9165220.8093050.4733940.610
411 ½41.21.6241,3332.0718001.2437061.0984130.6425330.828
53252.92.0832,1983.4081,3192.0451,1651.8066811.0568791.363
632 ½63.22.4893,1374.8661,8822.9201,6632.5799721.5081,2551.946
78378.53.0904,8407.4992,9044.4992,5653.9741,5002.3251,9363.000
913 ½90.73.5706,46110.0103,8776.0063,4245.3052,0033.1032,5844.004
1034102.94.0508,31612.8824,9907.7294,4076.8272,5783.9933,3265.153
1295128.95.07313,05020.2127,83012.1276,91610.7124,0466.2665,2208.085
1556154.86.09318,82129.15811,29317.4959,97515.4545,8359.0397,52811.663

Conduit is able to contain an allowable fill percent. Hence, a conduit fill chart is provide here.