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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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