overamped
Member
- Location
- California
I'm building a motor control panel and I have a question about calculating the 480 volt feeder size. When adding the sum of the loads (motors, heaters, tranformers etc.) do I use the amperage on the primary or the secondary side of the transformer? So if I have a 2 KVA transformer my primary side would be 4.2 amps but on my secondary would be 16.7. If I add the secondary my feeders would be much larger then if I add the primary.