Irrigation & Lighting Division

Ampacity Chart

TABLE B-310-1
AMPACITIES OF TWO OR THREE INSULATED CONDUCTORS

Rated 0 through 2000 volts, with an overall covering (Multiconductor), on Raceway in Free Air Based on Ambient Air Temperature of 30°C (86°F)

SIZE TEMPERATURE RATING OF CONDUCTOR, SEE TABLE 310-13 SIZE
AWG
kcmil
60°C
(140°F)
75°C
(167°F)
90°C
(194°F)
60°C
(140°F)
75°C
(167°F)
90°C
(194°F)
AWG
kcmil
TYPES
TW, UF
TYPES
RH, RHW, THHW
THW, THWN
TYPES
THHN,
THHW
TYPES
TW
TYPES
RH, RHW, THHW
THW, THHW
TYPES
THHN,
THHW
COPPER ALUMINUM OR COPPER-CLAD ALUMINUM
8
6
4
3
2
1
1/0
2/0
3/0
4/0
250
300
350
400
500
600
700
750
800
900
1000
36
48
66
76
88
102
121
138
158
187
205
234
255
274
315
343
376
387
397
415
448
43
58
79
90
105
121
145
166
189
223
245
281
305
328
378
413
452
466
479
500
542
48
65
89
102
119
137
163
186
214
253
276
317
345
371
427
468
514
529
543
570
617
28
38
51
59
69
80
94
108
124
147
160
185
202
218
254
279
310
321
331
350
382
33
45
61
70
83
95
113
129
147
176
192
221
242
261
303
335
371
384
397
421
460
37
51
69
79
93
106
127
146
167
197
217
250
273
295
342
378
420
435
450
477
521
8
6
4
3
2
1
1/0
2/0
3/0
4/0
250
300
350
400
500
600
700
750
800
900
1000
Ambient
Temp °C
For Ambient temperatures other than 30°C (86°F) multiple the
ampacities shown above by the appropriate factor shown below
Ambient
Temp °F
21-25
26-30
31-35
36-40
41-45
46-50
51-55
56-60
61-70
71-80
1.08
1.00
.91
.82
.71
.58
.41
-
-
-
1.05
1.00
.94
.88
.82
.75
.67
.58
.33
-
1.04
1.00
.96
.91
.87
.82
.76
.71
.58
.41
1.08
1.00
.91
.82
.71
.58
.41
-
-
-
1.05
1.00
.94
.88
.82
.75
.67
.58
.33
-
1.04
1.00
.96
.91
.87
.82
.76
.71
.58
.41
70-77
79-86
88-95
97-104
106-113
115-122
124-131
133-140
142-158
160-176