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OPM_SGS_ISG_M22_M30_0US_V011.doc 20/38 Installation Guide
SG Series
225 & 300 kVA
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 Temperature Rating of Conductor (See table 310-13)
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
or
kcmil
Types
TW, UF
Types
FEPW, RH,
RHW, THHW,
THW, THWN,
XHHW, USE,
ZW
Types
TBS, SA, SIS,
FEP, FEPB, MI,
RHH, RHW-2,
THHN, THHW,
THW-2,
THWN-2, USE-2,
XHH, XHHW,
XHHW-2,ZW-2
Types
TW, UF
Types
RH, RHW,
THHW,
THW, THWN,
XHHW, USE
Types
TBS, SA, SIS,
THHN, THHW,
THW-2,
THWN-2, RHH,
RHW-2, USE-2,
XHH, XHHW,
XHHW-2,
ZW-2
COPPER ALUMINUM or COPPER-CLAD ALUMINUM
18
--- --- 14 --- --- ---
16
--- --- 18 --- --- ---
14
20 20 25 --- --- ---
12
25 25 30 20 20 25
10
30 35 40 25 30 35
8
40 50 55 30 40 45
6
55 65 75 40 50 60
4
70 85 95 55 65 75
3
85 100 110 65 75 85
2
95 115 130 75 90 100
1
110 130 150 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
240 285 320 190 230 255
350
260 310 350 210 250 280
400
280 335 380 225 270 305
500
320 380 430 260 310 350
600
355 420 475 285 340 385
700
385 460 520 310 375 420
750
400 475 535 320 385 435
800
410 490 555 330 395 450
900
435 520 585 355 425 480
1000
455 545 615 375 445 500
1250
495 590 665 405 485 545
1500
520 625 705 435 520 585
1750
545 650 735 455 545 615
2000
560 665 750 470 560 630
CORRECTION FACTORS
Ambient
Temp. (°C)
For ambient temperatures other than 30°C (86°F), multiply the allowable ampacities shown above by the
appropriate factor below
21 - 25
1.08 1.05 1.04 1.08 1.05 1.04
26 - 30
1.00 1.00 1.00 1.00 1.00 1.00
31 - 35
0.91 0.94 0.96 0.91 0.94 0.96
36 - 40
0.82 0.88 0.91 0.82 0.88 0.91
41 - 45
0.71 0.82 0.87 0.71 0.82 0.87
46 - 50
0.58 0.75 0.82 0.58 0.75 0.82
51 - 55
0.41 0.67 0.76 0.41 0.67 0.76