FYI
The information on this page is for reference only. Please contact your local Electrician and Inspector before doing any electrical work.
| Transfomer Full Load Amperes | ||||||||||||
| 3Phase | ||||||||||||
| KVA | 1.5 | 3 | 9 | 15 | 30 | 45 | 75 | 112.5 | 150 | 225 | 300 | 500 |
| Voltage | ||||||||||||
| 120 | 7.20 | 14.4 | 43.3 | 72.2 | 144 | 217 | 361 | 541 | 722 | 1083 | 1444 | 2406 |
| 208 | 4.20 | 8.3 | 25 | 41.6 | 83.3 | 125 | 208 | 312 | 416 | 625 | 833 | 1388 |
| 240 | 3.60 | 7.2 | 21.7 | 36.1 | 72.2 | 108 | 180 | 271 | 361 | 541 | 722 | 1203 |
| 480 | 1.80 | 3.6 | 10.8 | 18 | 36.1 | 54.1 | 90.2 | 135 | 180 | 271 | 361 | 601 |
| 600 | 1.45 | 2.89 | 8.67 | 14.4 | 28.9 | 43.3 | 72.2 | 108 | 144 | 216 | 289 | 481 |
| Transformer Full Load Amperes | ||||||||||||||
| 1 Phase | ||||||||||||||
| KVA | 1.5 | 3 | 5 | 10 | 15 | 25 | 37.5 | 50 | 75 | 100 | 167 | 250 | 333 | 500 |
| Voltage | ||||||||||||||
| 120 | 12.5 | 25 | 41.67 | 83.33 | 125 | 208.3 | 312.5 | 416.7 | 625 | 833.0 | 1392 | 2083 | 2775 | 4167 |
| 240 | 6.25 | 12.5 | 20.83 | 41.67 | 62.5 | 104.2 | 156.3 | 208.3 | 312.5 | 416.7 | 696 | 1042 | 1388 | 2083 |
| 480 | 3.12 | 6.25 | 10.42 | 20.83 | 31.25 | 52.1 | 78.10 | 104.2 | 156.3 | 208.3 | 348 | 521. | 694 | 1042 |
| 600 | 2.5 | 5 | 8.33 | 16.67 | 25 | 41.67 | 62.5 | 83.3 | 125 | 166.7 | 248.5 | 416.7 | 555 | 833 |
| Size | Ampacities of Single- Insulated Conductors |
| AWG MCM | THHN Copper Wire 90Degrees "C" |
| 18 | 18 |
| 16 | 24 |
| 14 | 35 |
| 12 | 40 |
| 10 | 55 |
| 8 | 80 |
| 6 | 105 |
| 4 | 140 |
| 6 | 165 |
| 2 | 190 |
| 1 | 220 |
| 1/0 | 260 |
| 2/0 | 300 |
| 3/0 | 350 |
| 4/0 | 405 |
| 250 | 455 |
| 300 | 505 |
| 350 | 570 |
| 400 | 615 |
| 500 | 700 |
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