Table 310-16, Nec Allowable Ampacities Of Insulated Conductors - Liebert Series 600T Installation Manual

Earth (Directly Buried), Based on Ambient Temperature of 30 (86F)
Size
o
60 C
(140°F)
TYPES
TW=
UF=
AWG
kcmil
18 ......
16 ......
14* 20
12* 25
10* 30
8 40
6 55
4 70
3 85
2 95
1 110
1/0 125
2/0 145
3/0 165
4/0 195
250 215
300 240
350 260
400 280
500 320
600 355
700 385
750 400
800 410
900 435
1000 455
1250 495
1500 520
1750 545
2000 560
Ambient For ambient temperatures other than 30°C (86°F), multiply the allowable ampacities
Temp °C
21-25 1.08
26-30 1.00
31-35 .91
36-40 .82
41-45 .71
46-50 .58
51-55 .41
56-60 .......
61-70 .......
71-80 .......
*Unless otherwise specifically permitted in Section 240-3 of this Code, the overcurrent protection for conductor types marked with an asterisk (*) shall not
exceed 15 amperes for No. 14, 20 amperes for No. 12, and 30 amperes for No. 10 copper; or 15 amperes for No. 12 and 25 amperes for No. 10 aluminum
and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied.
Reprinted with permission from NEC 1999, NFPA 70, the National Electrical Code , Copyright 1998, National Fire Protection Association, Quincy,
MA 02269. This reprinted material is not the complete and official position of the National Fire Protection Association, on the referenced subject which
is represented only by the standard in its entirety.
24
Table 310-16. Allowable Ampacities of Insulated Conductors
Rated 0-2000 Volts, 60 to 90C (140 to 194F)
Not More Than Three Conductors in Raceway or Cable or
Temperature Rating of Conductor. See Table 310-13.
75°C 90°C
(167°F) (194°F)
TYPES TYPES
FEPW=, TBS, SA,
RH, RHW=, SIS, FEP=
THHW=, FEPB=, MI,
THW=, RHH= RHW-2
THWN=, THHN=, THHW=,
XHHW=, THW-2, THWN-2,
USE=, ZW= USE-2, XHH,
XHHW=
XHHW-2, ZW-2
COPPER
....... 14
....... 18
20 25
25 30
35 40
50 55
65 75
85 95
100 110
115 130
130 150
150 170
175 195
200 225
230 260
255 290
285 320
310 350
335 380
380 430
420 475
460 520
475 535
490 555
520 585
545 615
590 665
625 705
650 735
665 750
CORRECTION FACTORS
shown above by the appropriate factor shown below.
1.05 1.04
1.00 1.00
.94 .96
.88 .91
.82 .87
.75 .82
.67 .76
.58 .71
.33 .58
....... .41
60°C 75°C
(140°) (167°F)
TYPES TYPES
TW= RH=, RHW=,
UF= THHW=,
THW=,
THWN=,
XHHW=,
USE=
ALUMINUM OR COPPER-CLAD ALUMINUM
....... .......
....... .......
....... .......
20 20
25 30
30 40
40 50
55 65
65 75
75 90
85 100
100 120
115 135
130 155
150 180
170 205
190 230
210 250
225 270
260 310
285 340
310 375
320 385
330 395
355 425
375 445
405 485
435 520
455 545
470 560
1.08 1.05
1.00 1.00
.91 .94
.82 .88
.71 .82
.58 .75
.41 .67
.......
.58
....... .33
....... .......
Size
90°C
(194°F)
TYPES
TBS,
SA, SIS,
AWG
THHN=,
kcmil
THHW=,
THW-2, THWN-2,
RHH==, RHW-2,
USE-2,
XHH, XHHW=,
XHHW-2, ZW-2
....... .......
....... .......
....... .......
25 12*
35 10*
45 8*
60 6
75 4
85 3
100 2
115 1
135 1/0
150 2/0
175 3/0
205 4/0
230 250
255 300
280 350
305 400
350 500
385 600
420 700
435 750
450 800
480 900
500 1000
545 1250
585 1500
615 1750
630 2000
Ambient
Temp °F
1.04 70-77
1.00 78-86
.96 87-95
.91 96-104
.87 105-113
.82 114-122
.76 123-131
.71 132-140
.58 141-158
.41 159-176
Installation Manual