Modular Supports System Product Technical Guide June 2026 | Seite 204

Modular Support Systems Technical Guide, Edition 2
5.0 Reference
5.1 General Information for Load Tables
Electrical Metallic Tubing( EMT) Metal Thinwall Conduit
The following tables are for information only. As per UL Standard Safety 6, manufactured to ANSI C80.1
Conduit weight is an approximation.
Trade Size in
3 / 8 1 / 2 3 / 4 1 1-1 / 4 1-1 / 2 2 2-1 / 2 3 3-1 / 2 4
Galvanized Rigid Conduit( GRC)
Avg Outer
Diameter in( mm)
Avg Inner
Diameter in( mm)
Avg Wall
Thickness tw in( mm)
Approximate
Weight lb / 100 ft
( kg / m)
0.577
0.493
0.042
36.6
( 14.66)
( 12.52)
( 1.07)
( 0.54)
0.706
0.622
0.042
50.6
( 17.93)
( 15.80)
( 1.07)
( 0.75)
0.922
0.824
0.049
84.3
( 23.42)
( 20.93)
( 1.24)
( 1.25)
1.163
1.049
0.057
130.3
( 29.54)
( 26.64)
( 1.45)
( 1.94)
1.51
1.38
0.065
212.3
( 38.35)
( 35.05)
( 1.65)
( 3.16)
1.74
1.61
0.065
269.8
( 44.20)
( 40.89)
( 1.65)
( 4.02)
2.197
2.067
0.065
401.8
( 55.80)
( 52.50)
( 1.65)
( 5.98)
2.875
2.731
0.072
579
( 73.03)
( 69.37)
( 1.83)
( 8.62)
3.5
3.356
0.072
826.3
( 88.90)
( 85.24)
( 1.83)
( 12.30)
4
3.834
0.083
1098
( 101.60)
( 97.38)
( 2.11)
( 16.34)
4.5
4.334
0.083
1364
( 114.30)
( 110.08)
( 2.11)
( 20.30)
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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