5.0 REFERENCE 5.1 GENERAL INFORMATION FOR LOAD TABLES
GALVANIZED RIGID STEEL CONDUIT
The following tables are for information only. As per UL Standard Safety 6 manufactured to ANSI C80.1
For Galvanized Rigid Conduit( GRC) Trade Tolerances are for outer diameter:- /+ 0.015 inches for 1 / 2 " to 1-1 / 2 "- /+ 1 % for 2 " to 6 "
Conduit weight is an approximation.
Trade Size( in)
1 / 2
3 / 4
1
1-1 / 4
1-1 / 2
2
2-1 / 2
3
3-1 / 2
4
5
6
Galvanized Rigid Conduit( GRC)
Avg Outer Diameter in( mm)
Avg Inner Diameter in( mm)
Avg Wall Thickness
t w in( mm)
Approximate Weight lb / 100 ft( kg / m)
0.84 |
0.632 |
0.104 |
82 |
( 21.3) |
( 16.05) |
( 2.64) |
( 1.22) |
1.05 |
0.836 |
0.107 |
109 |
( 26.7) |
( 21.23) |
( 2.72) |
( 1.62) |
1.315 |
1.063 |
0.126 |
161 |
( 33.4) |
( 27.00) |
( 3.20) |
( 2.40) |
1.66 |
1.394 |
0.133 |
218 |
( 42.2) |
( 35.41) |
( 3.38) |
( 3.24) |
1.99 |
1.624 |
0.138 |
263 |
( 50.5) |
( 41.25) |
( 3.51) |
( 3.91) |
2.375 |
2.083 |
0.146 |
350 |
( 60.3) |
( 52.91) |
( 3.71) |
( 5.21) |
2.875 |
2.489 |
0.193 |
559 |
( 73.0) |
( 63.22) |
( 4.90) |
( 8.32) |
3.5 |
3.09 |
0.205 |
727 |
( 88.9) |
( 78.49) |
( 5.21) |
( 10.82) |
4 |
3.57 |
0.215 |
880 |
( 101.6) |
( 90.68) |
( 5.46) |
( 13.10) |
4.5 |
4.05 |
0.225 |
1030 |
( 114.3) |
( 102.87) |
( 5.72) |
( 15.33) |
5.563 |
5.073 |
0.245 |
1520 |
( 141.3) |
( 128.85) |
( 6.22) |
( 22.62) |
6.625 |
6.093 |
0.266 |
1785 |
( 168.3) |
( 154.76) |
( 6.76) |
( 26.56) |
Rigid and Intermediate Metal Conduit shall be supported at least every 10 feet( 3.05 m) and within 3 feet( 914 mm) of each outlet box, junction box, cabinet, or fitting, except for straight runs of conduit connected with couplings which may be supported in accordance with NEC Article 345 and 346, provided such supports prevent transmission of stresses to termination where conduit is deflected between supports.
Modular Support Systems Technical Guide, Edition 1
INTERMEDIATE METAL CONDUIT
The following tables are for information only. As per UL Standard Safety 6 manufactured to ANSI C80.1 For Intermediate Metal Conduit( IMC) Trade Tolerances are for outer diameter:- /+ 0.005 inches for 1 / 2 " to 1 "- /+ 0.0075 inches for 1-1 / 4 " to 2 "- /+ 0.10 inches for 2 " to 4 "
For Intermediate Metal Conduit( IMC) Trade Tolerances for wall thickness:- /+ 0.15 inches for 1 / 2 " to 2 "- /+ 0.20 inches for 2-1 / 2 " to 4 "
Conduit weight is an approximation.
Trade Size( in)
1 / 2
3 / 4
1
1-1 / 4
1-1 / 2
2
2-1 / 2
3
3-1 / 2
4
Intermediate Metal Conduit( IMC)
Avg Outer Diameter in( mm)
Avg Inner Diameter in( mm)
Avg Wall Thickness
t w in( mm)
Approximate Weight lb / 100 ft( kg / m)
0.815 |
0.675 |
0.07 |
62 |
( 20.70) |
( 17.15) |
( 1.8) |
( 0.92) |
1.029 |
0.879 |
0.075 |
84 |
( 26.14) |
( 22.33) |
( 1.9) |
( 1.25) |
1.29 |
1.12 |
0.085 |
119 |
( 32.77) |
( 28.45) |
( 2.2) |
( 1.77) |
1.638 |
1.468 |
0.085 |
158 |
( 41.61) |
( 37.29) |
( 2.2) |
( 2.35) |
1.883 |
1.703 |
0.09 |
194 |
( 47.83) |
( 43.26) |
( 2.3) |
( 2.89) |
2.36 |
2.17 |
0.095 |
256 |
( 59.94) |
( 55.12) |
( 2.4) |
( 3.81) |
2.857 |
2.597 |
0.14 |
441 |
( 72.57) |
( 65.96) |
( 3.6) |
( 6.56) |
3.476 |
3.216 |
0.14 |
543 |
( 88.29) |
( 81.69) |
( 3.6) |
( 8.08) |
3.971 |
3.711 |
0.14 |
629 |
( 100.86) |
( 94.26) |
( 3.6) |
( 9.36) |
4.466 |
4.206 |
0.14 |
700 |
( 113.44) |
( 106.83) |
( 3.6) |
( 10.42) |
Rigid and Intermediate Metal Conduit shall be supported at least every 10 feet( 3.05 m) and within 3 feet( 914 mm) of each outlet box, junction box, cabinet, or fitting, except for straight runs of conduit connected with couplings which may be supported in accordance with NEC Article 345 and 346, provided such supports prevent transmission of stresses to termination where conduit is deflected between supports.
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