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Electrical Code NEC-Table310-16

Allowable Ampacities of Insulated Conductors

electrical-wiring
Summary: Table 310-16.  (1999 N.E.C.)  Allowable Ampacities of Insulated Conductors Rated 0 through 2000 Volts 60° to 90°C (140° to 194°F) Not More Than Three Current-Carrying Conductors in Raceway or Cable or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F).


Maximum Number of Conductors in
Electrical Metalic Tubing

Type

Conductor

Trade Size (in.)

THHN,
THWN,
THWN-2

Size
(AWG /
kcmil)

½

 ¾

1

1¼

1½

2

2½

3

3½

4
14
12
10
8		 12
9
5
3		 22
16
10
6		 35
26
16
9		 61
45
28
16		 84
61
38
22		 138
101
63
36		 241
176
111
64		 364
266
167
96		 476
347
219
126		 608
443
279
161

6
4
3
2
1

2
1
1
1
1

4
2
1
1
1

7
4
3
3
1

12
7
6
5
4

16
10
8
7
5

26
16
13
11
8

46
28
24
20
15

69
43
36
30
22

91
56
47
40
29

116
71
60
51
37

1/0
2/0
3/0
4/0
250

1
0
0
0
0

1
1
1
1
0

1
1
1
1
1

3
2
1
1
1

4
3
3
2
1

7
6
5
4
3

12
10
8
7
6

19
16
13
11
9

25
20
17
14
11

32
26
22
18
15

300
350
400
500
600

0
0
0
0
0

0
0
0
0
0

1
1
0
0
0

1
1
1
1
1

1
1
1
1
1

3
2
1
1
1

5
4
4
3
2

7
6
6
5
4

10
9
8
6
5

13
11
10
8
7
700
750
800
900
1000

0
0
0
0
0

0
0
0
0
0

0
0
0
0
0

1
0
0
0
0

1
1
1
1
1

1
1
1
1
1

2
1
1
1
1

3
3
3
3
2

4
4
4
3
3

6
5
5
4
4
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