Electrical Reference Resources
Maximum number of conductors in electrical
metallic tubing
|
|
Trade sizes in inches |
Type
Letters |
Cond.
Size
AWG/
kcmil |
1/2 |
3/4 |
1
|
1 1/4 |
1 1/2 |
2
|
2 1/2 |
3
|
3 1/2 |
4
|
THHN,
THWN,
THWN-2 |
14 |
12 |
22 |
35 |
61 |
84 |
138 |
364 |
364 |
476 |
608 |
|
12 |
9 |
16 |
26 |
45 |
691 |
101 |
266 |
266 |
347 |
443 |
|
10 |
5 |
10 |
16 |
28 |
38 |
63 |
167 |
167 |
219 |
279 |
|
8 |
3 |
6 |
9 |
16 |
22 |
36 |
96 |
96 |
126 |
161 |
|
6 |
2 |
4 |
7 |
12 |
16 |
26 |
69 |
69 |
91 |
116 |
|
4 |
1 |
2 |
4 |
7 |
10 |
16 |
43 |
43 |
56 |
71 |
|
3 |
1 |
1 |
3 |
6 |
8 |
13 |
36 |
36 |
47 |
60 |
|
2 |
1 |
1 |
3 |
5 |
7 |
11 |
30 |
30 |
40 |
51 |
|
1 |
1 |
1 |
1 |
4 |
5 |
8 |
22 |
22 |
29 |
37 |
|
1/0 |
1 |
1 |
1 |
3 |
4 |
7 |
12 |
19 |
25 |
32 |
|
2/0 |
0 |
1 |
1 |
2 |
3 |
6 |
10 |
16 |
20 |
26 |
|
3/0 |
0 |
1 |
1 |
1 |
3 |
5 |
8 |
13 |
17 |
22 |
|
4/0 |
0 |
1 |
1 |
1 |
2 |
4 |
7 |
11 |
14 |
18 |
|
250 |
0 |
0 |
1 |
1 |
1 |
3 |
6 |
9 |
11 |
15 |
|
300 |
0 |
0 |
1 |
1 |
1 |
3 |
5 |
7 |
10 |
13 |
|
350 |
0 |
0 |
1 |
1 |
1 |
2 |
4 |
6 |
9 |
11 |
|
400 |
0 |
0 |
0 |
1 |
1 |
1 |
4 |
6 |
8 |
10 |
|
500 |
0 |
0 |
0 |
1 |
1 |
1 |
3 |
5 |
6 |
8 |
|
600 |
0 |
0 |
0 |
1 |
1 |
1 |
2 |
4 |
5 |
7 |
|
700 |
0 |
0 |
0 |
1 |
1 |
1 |
2 |
3 |
4 |
6 |
|
750 |
0 |
0 |
0 |
0 |
1 |
1 |
1 |
3 |
4 |
5 |
© Ugly's™ Electrical
References revised 2008 Edition