Reference Data
Rigid Steel Conduit (Heavy Wall Conduit)
Nominal
Conduit Size
mm
In.
mm
3/8”
(10)
(15)
3/4”
(20)
0.675
0.840
1.050
1.315
1.660
1.900
2.375
2.875
3.500
4.000
4.500
5.563
6.625
(17.1)
1/2”
In.
Minimum Weight
Per 100 Ft. (30.5m) with
Couplings Attached
mm
0.493 (12.5)
0.632 (16.0)
0.836 (21.3)
1.063 (27.0)
1.394 (35.4)
1.624 (41.3)
2.083 (52.9)
2.489 (63.2)
3.090 (78.5)
3.570 (90.7)
4.050 (102.9)
5.073 (128.9)
6.093 (154.8)
(21.3)
(26.7)
(33.4)
(42.2)
(48.3)
(60.3)
(73.0)
(88.9)
(101.6)
(114.3)
(141.3)
(168.3)
Weight of Conduit
and Conductors
Per 100 Ft. (30.5m)*
Lbs.
kg
Lbs.
kg
51.5
79.0
105.0
153.0
201.0
249.0
332.0
527.0
682.6
831.0
972.3
1313.6
1745.3
(23.4)
65.1
101.1
145.8
219.3
318.3
408.8
593.8
901.0
1259.0
1604.0
1967.0
2876.0
4003.0
(29.5)
(35.8)
(47.6)
(69.4)
(91.2)
(113.0)
(150.6)
(239.1)
(309.6)
(376.9)
(441.0)
(595.9)
(791.7)
(45.9)
(66.1)
(99.5)
(144.4)
(185.4)
(269.3)
(408.7)
(571.1)
(727.6)
(892.2)
(1304.5)
(1815.7)
Dimensions taken from ANSI C80.1-1977.
*Conduit plus weight of heaviest conductor combination as specified by the National Electrical Code.
Intermediate Metal Conduit (IMC)
Nominal
Conduit Size
In.
mm
In.
mm
1/2”
(15)
(20)
0.815
1.029
1.290
1.638
1.883
2.360
2.857
3.476
3.971
4.466
(20.7)
3/4”
(25)
1”
11/4” (32)
11/2” (40)
(50)
2”
21/2” (65)
(80)
3”
31/2” (90)
4” (100)
Nominal
Inside
Diameter
Outside
Diameter
In.
Minimum Weight
Per 100 Ft. (30.5m) with
Couplings Attached
mm
.675 (17.1)
.879 (22.3)
1.120 (28.4)
1.468 (37.3)
1.703 (43.3)
2.170 (55.1)
2.597 (66.0)
3.216 (81.7)
3.711 (94.3)
4.206 (106.8)
(26.1)
(32.7)
(41.6)
(47.7)
(59.9)
(72.5)
(88.3)
(100.8)
(113.4)
Weight of Conduit
and Conductors
Per 100 Ft. (30.5m)*
Lbs.
kg
Lbs.
kg
60.0
82.0
116.0
150.0
182.0
242.0
428.0
526.0
612.0
682.0
(27.2)
82.1
122.8
182.3
267.3
341.8
503.8
775.0
1069.0
1346.0
1632.0
(37.2)
(37.2)
(52.6)
(68.0)
(82.5)
(109.7)
(194.1)
(238.6)
(277.6)
(309.4)
(55.7)
(82.7)
(121.2)
(155.0)
(228.5)
(351.5)
(485.0)
(610.8)
(740.5)
*Conduit plus weight of heaviest conductor combination as specified by the National Electrical Code.
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.
NEC Table 346-12
Conduit Size
In.
Feet
Meters
(15 - 20)
(25)
10
12
(3.05)
(3.66)
11/4 - 11/2
(32 - 40)
14
(4.27)
2 - 21/2
(50 - 65)
16
(4.88)
3-6
(80 - 150)
20
(6.10)
1/2
Strut Systems
Maximum Support Span
mm
1
3/4
234
Reference Data
In.
(25)
1”
11/4” (32)
11/2” (40)
(50)
2”
21/2” (65)
(80)
3”
1
3 /2” (90)
4” (100)
5” (125)
6” (150)
Nominal
Inside
Diameter
Outside
Diameter