Trane Starters Engineering Bulletin page 59

Table 13. MCA look-up table for 90°C copper conductors rated for 0–2,000 Volts
1 Conduit
Wire Size 3 Wires
8 55
6 75
4 95
3 115
2 130
1 145
0 170
00 195
000 225
0000 260
250 290
300 320
350 350
400 380
500 430
600 475
Note: Use this table to select supply leads for all starters and motor leads for remote-mounted across-the-line, primary reactor, autotransformer, and
Adaptive Frequency Drives. Value in table must be larger than the MCA to use the wire combination.
(a) , Based on 2011 NEC Table 310.15(B)(16)
Table 14. MCA look-up table for 90°C copper conductors rated for 0–2,000 Volts
1 Conduit
Wire Size 6 Wires
8 75
6 103
4 131
3 158
2 179
1 200
0 234
00 269
000 310
0000 358
250 400
300 441
350 482
400 524
500 593
600 655
Note: Use this table to size motor leads from remote-mounted wye-delta and solid-state starters (inside-the-delta
designs only). Value in table must be larger than the MCA to use the wire combination.
(a) Based on 2011 NEC Table 310.15(B)(16)
CTV-PRB004-EN
1 Conduit 2 Conduits
6 Wires 3 Wires ea.
272 340
312 390
360 450
416 520
464 580
512 640
560 700
608 760
688 860
760 950
2 Conduits 2 Conduits
3 Wires ea. 6 Wires ea.
94
129
163
198
224
250
293 469
336 537
387 620
448 717
500 800
551 882
603 965
655 1048
741 1186
819 1310
Electrical System–Power Wire Sizing
3 Conduits 2 Conduits
3 Wires ea. 6 Wires ea.
510 544
585 624
675 720
780 832
870 928
960 1024
1050 1120
1140 1216
1290 1376
1425 1520
4 Conduits 3 Conduits
3 Wires ea. 6 Wires ea.
586 703
672 806
775 931
896 1075
1000 1200
1103 1324
1206 1448
1310 1572
1482 1779
1637 1965
(a)
4 Conduits 5 Conduits
3 Wires ea. 3 Wires ea.
680 850
780 975
900 1125
1040 1300
1160 1450
1280 1600
1400 1750
1520 1900
1720 2150
1900 2375
(a)
6 Conduits
3 Wires ea.
879
1008
1163
1344
1500
1655
1810
1965
2224
2456
6 Conduits
3 Wires ea.
1020
1170
1350
1560
1740
1920
2100
2280
2580
2850
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