GE 225 Installation Manual page 20

g
NEC SECTION 210-20 (a)
Table 310-16. Allowable Ampacities of Insulated Conductors Rated O Through 2000 Volts,
60°C Trough 90°C (140°F Trough 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).
Size
60°C (140°F)
Types
TW, UF
AWG
or
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 shown above by the
Temp. (°C)
21 - 25 1.08
26 - 30 1.00
31 - 35 0.91
36 - 40 0.82
41 - 45 0.71
46 - 50 0.58
51 - 55 0.41
OPM_SGS_ISG_M22_M30_0US_V011.doc
Temperature Rating of Conductor (See table 310-13)
75°C (167°F) 90°C (194°F)
Types Types
FEPW, RH, TBS, SA, SIS,
RHW, THHW, FEP, FEPB, MI,
THW, THWN, RHH, RHW-2,
XHHW, USE, THHN, THHW,
ZW THW-2,
THWN-2, 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
appropriate factor below
1.05 1.04
1.00 1.00
0.94 0.96
0.88 0.91
0.82 0.87
0.75 0.82
0.67 0.76
20/38
60°C (140°F) 75°C (167°F)
Types Types
TW, UF RH, RHW,
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
0.91 0.94
0.82 0.88
0.71 0.82
0.58 0.75
0.41 0.67
Installation Guide SG Series 225 & 300 kVA
GE
90°C (194°F)
Types
TBS, SA, SIS,
THHN, THHW,
THW-2,
THWN-2, RHH,
RHW-2, USE-2,
XHH, XHHW,
XHHW-2,
ZW-2
---
---
---
25
35
45
60
75
85
100
115
135
150
175
205
230
255
280
305
350
385
420
435
450
480
500
545
585
615
630
1.04
1.00
0.96
0.91
0.87
0.82
0.76