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Maximum Number of Conductors in Rigid PVC Conduit, Schedule 40

Type Letters THHN, THWN, THWN-2
Cond. Size AWG/kcmil Trade Sizes in Inches
0.50
0.75
1.00
1.25
1.50
2.00
2.50
3.00
3.50
4.00
5.00
6.00
14
11
21
34
60
82
135
193
299
401
517
815
1178
12
8
15
25
43
59
99
141
218
293
377
594
859
10
5
9
15
27
37
62
89
137
184
238
374
541
8
3
5
9
16
21
36
51
79
106
137
216
312
6
1
4
6
11
15
26
37
57
77
99
156
225
4
1
2
4
7
9
16
22
35
47
61
96
138
3
1
1
3
6
8
13
19
30
40
51
81
117
2
1
1
3
5
7
11
16
25
33
43
68
98
1
1
1
1
3
5
8
12
18
25
32
50
73
1/0
1
1
1
3
4
7
10
15
21
27
42
61
2/0
0
1
1
2
3
6
8
13
17
22
35
51
3/0
0
1
1
1
3
5
7
11
14
18
29
42
4/0
0
1
1
1
2
4
6
9
12
15
24
35
250
0
0
1
1
1
3
4
7
10
12
20
28
300
0
0
1
1
1
3
4
6
8
11
17
24
350
0
0
1
1
1
2
3
5
7
9
15
21
400
0
0
0
1
1
1
3
5
6
8
13
19
500
0
0
0
1
1
1
2
4
5
7
11
16
600
0
0
0
1
1
1
1
3
4
5
9
13
700
0
0
0
0
1
1
1
3
4
5
8
11
750
0
0
0
0
1
1
1
2
3
4
7
11