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Service
Maintenance
Company, Inc.
Electrical Contractors |
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NEC TABLE 310-16 Wire Ampacities
| NEC Table 310-16 Wire Ampacities |
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Copper |
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Aluminum |
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60C-140F |
75C-167F |
90C-194F |
60C-140F |
75C-167F |
90C-194F |
| AWG
or kcmil |
TW,UF |
THW, THWN, USE |
THHN, THWN-2 |
TW,UF |
THW, THWN, USE |
THHN, THWN-2 |
| 18 |
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14 |
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| 16 |
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18 |
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| 14* |
20 |
20 |
25 |
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| 12* |
25 |
25 |
30 |
20 |
20 |
25 |
| 10* |
30 |
35 |
40 |
25 |
30 |
35 |
| 8 |
40 |
50 |
55 |
30 |
40 |
45 |
| 6 |
55 |
65 |
75 |
40 |
50 |
60 |
| 4 |
70 |
85 |
95 |
55 |
65 |
75 |
| 3 |
85 |
100 |
110 |
65 |
75 |
85 |
| 2 |
95 |
115 |
130 |
75 |
90 |
100 |
| 1 |
110 |
130 |
150 |
85 |
100 |
115 |
| 1/0 |
125 |
150 |
170 |
100 |
120 |
135 |
| 2/0 |
145 |
175 |
195 |
115 |
135 |
150 |
| 3/0 |
165 |
200 |
225 |
130 |
155 |
175 |
| 4/0 |
195 |
230 |
260 |
150 |
180 |
205 |
| 250 |
215 |
255 |
290 |
170 |
205 |
230 |
| 300 |
240 |
285 |
320 |
190 |
230 |
255 |
| 350 |
260 |
310 |
350 |
210 |
250 |
280 |
| 400 |
280 |
335 |
380 |
225 |
270 |
305 |
| 500 |
320 |
380 |
430 |
260 |
310 |
350 |
| 600 |
355 |
420 |
475 |
285 |
340 |
385 |
| 700 |
385 |
460 |
520 |
310 |
375 |
420 |
| 750 |
400 |
475 |
535 |
320 |
385 |
435 |
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| Ambient
Temperature Correction In Degrees F |
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| 70-77 |
1.08 |
1.05 |
1.04 |
1.08 |
1.05 |
1.04 |
| 78-86 |
1 |
1 |
1 |
1 |
1 |
1 |
| 87-95 |
0.91 |
0.94 |
0.96 |
0.91 |
0.94 |
0.96 |
| 96-104 |
0.82 |
0.88 |
0.91 |
0.82 |
0.88 |
0.91 |
| 105-113 |
0.71 |
0.82 |
0.87 |
0.71 |
0.82 |
0.87 |
| 114-122 |
0.58 |
0.75 |
0.82 |
0.58 |
0.75 |
0.82 |
| 123-131 |
0.41 |
0.67 |
0.76 |
0.41 |
0.67 |
0.76 |
| 132-140 |
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0.58 |
0.71 |
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0.58 |
0.71 |
| 141-158 |
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0.33 |
0.58 |
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0.33 |
0.58 |
| 159-176 |
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0.41 |
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0.41 |
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