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APPENDIX
>
Allowable Ampacities of Insulated Conductors
>
Allowable Ampacities of Insulated Copper Conductors
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Allowable Ampacities of Insulated Copper Conductors
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Allowable Ampacities of Insulated Conductors
Rated Up to and Including 2000 Volts, 60°C through 90°C (140°F through 194°F).
Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried).
Based on Ambient Temperature of 30°C (86°F).
NEC table 310
Conductor
Size
(AWG/KCMIL)
60°C/140°F
TW, UF
75°C/167°F
RHW, THHW, THW, THWN, XHHW, USE, ZW
90°C/194°F
TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, XHH, XHHW, XHHW-2, USE-2, ZW
18
-
-
14
16
-
-
18
14*
15
20
25
12*
20
25
30
10*
30
35
40
8
40
50
55
6
55
65
75
4
70
85
95
3
85
100
115
2
95
115
130
1
110
130
145
1
/0
125
150
170
2
/0
145
175
195
3
/0
165
200
225
4/0
195
230
260
250
215
255
290
300
240
285
320
350
260
310
350
400
280
335
380
500
320
380
430
600
350
420
475
700
385
460
520
750
400
475
535
800
410
490
555
900
435
520
585
1000
455
545
615
* Small Conductors. Unless specifically permitted in 240.4(E) through (G), the over current protection shall not exceed
15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG
and 25 amperes for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature
and number of conductors have been applied.
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