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Ampacities of Insulated Conductors From NEC Table 310.16 (2020 edition)

Not More than Three Conductors in Raceway, Cable or Earth (Directly Buried)
(Based on Ambient Temperature of 30° C, 86° F)

The previous table version can be seen here.

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Size Copper Conductors Aluminum Conductors
Copper-Clad Conductors
  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 Types Types Types Types Types
TW RHW TBS, SA, SIS, TW RHW TBS
UF THHW FEP, FEPB, MI, UF THHW SA, SIS
THW PFA, RHH, THW THHN, THHW
THWN RHW-2, THHN, THWN THW-2
XHHW THHW, THW-2, XHHW THHW-2, RHH,
XHWN THWN-2, XHWN RHW-2, USE-2,
USE USE-2, XHH, USE XHH, XHHW,
ZW XHHW, XHHW-2, XHHW-2, XHWN
XHWN, XHWN-2, XHH, XHHW
XHHN, Z, ZW-2 XHWN-2, XHHN
 
18 *
-
-
14
-
-
-
16 *
-
-
18
-
-
-
14 *
15
20
25
-
-
-
12 *
20
25
30
15
20
25
10 *
30
35
40
25
30
35
8
40
50
55
35
40
45
6
55
65
75
40
50
55
4
70
85
95
55
65
75
3
85
100
115
65
75
85
2
95
115
130
75
90
100
1
110
130
145
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
195
230
260
350
260
310
350
210
250
280
400
280
335
380
225
270
305
500
320
380
430
260
310
350
600
350
420
475
285
340
385
700
385
460
520
315
375
425
750
400
475
535
320
385
435
800
410
490
555
330
395
445
900
435
520
585
355
425
480
1000
455
545
615
375
445
500
1250
495
590
665
405
485
545
1500
525
625
705
435
520
585
1750
545
650
735
455
545
615
2000
555
665
750
470
560
630

Notes:

1. Section 310.15(B) shall be refrenced for ampacity correction factors where the ambient temperature is other than 30 C (86 F).

2. Section 310.15(C)(1) shall be refrenced for more than three current-carrying conductors.

3. Section 310.16 shall be refrenced for conditions of use.

*Section 240.4(D) shall be refrenced for conductor overcurrent protection limitations, except as modified elsewhere in the Code.

 

Correction Factors for Ambient Temperature From NEC Table 310.15(B)(1)

Over 30° C, 86° F

For Ambient Temperatures Over 30° C, 86° F, multiply the ampacities shown above by the appropriate factor show below:
Ambient Temperature Copper Conductors Aluminum Conductors
Copper-Clad Conductors

21-25 C,

79-77 F

  1.08 1.05 1.04     1.08 1.05 1.04  

26-30 C,

78-86 F

1 1 1 1 1 1

31-35 C,

87-95 F

0.91 0.94 0.96 0.91 0.94 0.96

36-40 C,

96-104 F

0.82 0.88 0.91 0.82 0.88 0.91

41-45 C,

105-113 F

0.71 0.82 0.87 0.71 0.82 0.87

46-50 C,

114-122 F

0.58 0.75 0.82 0.58 0.75 0.82

51-55 C,

123-131 F

0.41 0.67 0.76 0.41 0.67 0.76

56-60 C,

132-140 F

- 0.58 0.71 - 0.58 0.71

61-65 C,

141-149 F

- 0.47 0.65 - 0.47 0.65

66-70 C,

150-158 F

- 0.33 0.58 - 0.33 0.58

71-75 C,

159-167 F

- - 0.50 - - 0.50
76-80 C, 168-176 F - - 0.41 - - 0.41

81-85 C,

177-185 F

- - 0.29 - - 0.29
 

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References: To buy NEC National Electric Code books go to World Wide Web "nfpa.org"

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