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| TRANSFORMER WIRING CHART 480v ( 3ø + GC - 208Y / 120V (3ø + N + EG) |
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PRIMARY |
SECONDARY |
| TXMR KVA RATING |
MAX kVA Note 1 |
CURRENT |
FUSE/BKR |
ø WIRE |
G.C. Note 2 |
COND. SIZE |
CURRENT |
FUSE/ BKR |
WIRE ø & N. |
SIZE E.G |
COND. SIZE |
| 6 |
5.76 |
7.2 |
20 |
12 |
8 |
½ |
16.7 |
20 |
10 |
10 |
½" |
| 9 |
8.64 |
10.8 |
30 |
10 |
8 |
½ |
25 |
30 |
8 |
10 |
3/4" |
| 15 |
14.4 |
18.0 |
40 |
8 |
8 |
3∕4 |
41.6 |
50 |
6 |
10 |
1 ¼" |
| 30 |
28.8 |
36.1 |
50 |
6 |
8 |
1 |
83.3 |
100 |
2 |
6 |
1 ½" |
| 45 |
43.2 |
54.1 |
70 |
4 |
4 |
1 ¼ |
125 |
150 |
2∕0 |
6 |
2" |
| 75 |
72 |
90.2 |
125 |
1 |
1 |
1 ¼ |
208 |
250 |
300 |
2 |
3" |
| 112 ½ |
112 ½ |
135 |
175 |
2∕0 |
1∕0 |
2 |
312 |
400 |
500 |
2 |
3 ½" |
| 150 |
144 |
180 |
250 |
250 |
250 |
2 ½ |
416 |
500 |
2 runs 250 |
2#1 |
2-3" |
| 225 |
225 |
270 |
350 |
500 |
500 |
3 |
625 |
800 |
2 runs 500 |
2#1∕0 |
2-3 ½" |
| 300 |
288 |
361 |
500 |
2 runs 250 |
2#3∕0 |
2-2½ |
833 |
1000 |
3 runs 400 |
3#2∕0 |
3-3 ½" |
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| Notes: |
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| 1 |
Maximum load transformer is not to exceed the figures in this column. |
| 2 |
The equipment ground conductors from the transformer back to the service entrance ground must not be smaller than this neutral ground conductor (GC). |
| 3 |
If the secondary panel, switchboard, or MGC is more than 25 feet away from the transformer, overcurrent protection shall be provided at the transformer. |
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