Reference Data
Electrical Metallic Tubing (EMT) — Thinwall Conduit
Reference Data
Nominal
Conduit Size
Outside
Diameter
In.
mm
In.
mm
3/8”
(10)
(15)
3/4”
(20)
0.577
0.706
0.922
1.163
1.510
1.740
2.197
2.875
3.500
4.000
4.500
(14.7)
1/2”
(25)
1”
11/4” (32)
11/2” (40)
(50)
2”
21/2” (65)
(80)
3”
31/2” (90)
4” (100)
Weight
Per 100 Ft. (30.5m) with
Inside
Diameter
In.
mm
0.493 (12.5)
0.622 (15.8)
0.824 (20.9)
1.049 (26.6)
1.380 (35.1)
1.610 (40.9)
2.067 (52.5)
2.731 (69.4)
3.356 (85.2)
3.834 (97.4)
4.334 (110.1)
(17.9)
(23.4)
(29.5)
(38.3)
(44.2)
(55.8)
(73.0)
(88.9)
(101.6)
(114.3)
Weight of Conduit
and Conductors
Per 100 Ft. (30.5m)*
Lbs.
kg
Lbs.
kg
23.0
28.5
43.5
64.0
95.0
110.0
140.0
205.0
250.0
325.0
370.0
(10.4)
36.6
50.6
84.3
130.3
212.3
269.8
401.8
579.0
826.3
1098.0
1364.0
(16.6)
(12.9)
(19.7)
(29.0)
(43.1)
(49.9)
(63.5)
(93.0)
(113.4)
(147.4)
(167.8)
(23.0)
(38.2)
(59.1)
(96.3)
(122.4)
(182.3)
(262.6)
(374.8)
(498.0)
(618.7)
Dimensions taken from ANSI C80.3-1977.
*Conduit plus weight of heaviest conductor combination as specified by the National Electrical Code.
Electrical Metallic tubing 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. See NEC Article 348.
Rigid Aluminum Conduit
Nominal
Conduit Size
Nominal
Inside
Diameter
Outside
Diameter
In.
mm
In.
mm
1/2”
(15)
(20)
0.840
1.050
1.315
1.660
1.900
2.375
2.875
3.500
4.000
4.500
5.563
6.625
(21.3)
3/4”
(25)
1”
11/4” (32)
11/2” (40)
(50)
2”
21/2” (65)
(80)
3”
31/2” (90)
4” (100)
5” (125)
6” (150)
In.
Minimum Weight
Per 100 Ft. (30.5m) with
Couplings Attached
mm
0.632 (16.1)
0.836 (21.2)
1.063 (27.0)
1.394 (35.4)
1.624 (41.2)
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)
(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
27.4
36.4
53.0
69.6
82.2
115.7
182.5
238.9
287.7
340.0
465.4
612.5
(12.4)
49.5
77.2
119.3
186.9
242.0
377.5
556.5
815.2
1061.0
1334.0
2028.0
2870.0
(22.5)
(16.5)
(24.0)
(31.6)
(37.3)
(52.5)
(82.8)
(108.4)
(130.5)
(154.2)
(211.1)
(277.8)
(35.0)
(54.1)
(84.8)
(109.8)
(171.2)
(252.4)
(369.8)
(481.3)
(605.1)
(919.9)
(1301.8)
Dimensions taken from ANSI C80.5-1977.
*Conduit plus weight of heaviest conductor combination as specified by the National Electrical Code.
Aluminum Rigid 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 Table 344.30 (B)(2), provided such supports prevent transmission of stresses to termination where
conduit is deflected between supports.
NEC TABLE 344.30 (B)(2)
Conduit Size
In.
Maximum Support Span
mm
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
- 3/4
1
235
Strut Systems