Electrical Code NEC-Table310-16
Allowable Ampacities of Insulated Conductors
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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).
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Maximum Number of Conductors in |
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Type |
Conductor |
Trade Size (in.) |
|||||||||
THHN, |
Size |
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 |
2 |
4 |
7 |
12 |
16 |
26 |
46 |
69 |
91 |
116 |
|
1/0 |
1 |
1 |
1 |
3 |
4 |
7 |
12 |
19 |
25 |
32 |
|
300 |
0 |
0 |
1 |
1 |
1 |
3 |
5 |
7 |
10 |
13 |
|
700 750 800 900 1000 |
0 |
0 |
0 |
1 |
1 |
1 |
2 |
3 |
4 |
6 |
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