30 Kva Transformer Wiring Diagram

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Joined apr 19, 2009. #2 · jul 11, 2020. If there are any across the line motor starters of any sizable horsepower, a 30 kva transformer could be to small to handle the inrush demands. That being said, #8 fused at 50 amp would be minimum on the load (480) side. the line (208) side would need to be minimum #3 fused at 100 amp.

Transformers manufactured above 200 kva will have subtractive polarities. A transformer wiring diagram can be found printed on the transformer nameplate or inside the cover to the wiring compartment. The leads or terminals are marked with hs and xs. And 50 kva transformers 18 cnnts007 3 connector, transformer secondary set screw type with inhibitor ¾” stud, range: 8 cai rh 010 30 cable, no. 4 covered soft drawn copper, ft 9 cla tg 001 2 clamp, transformer tank ground. At 240 volts, a 30 kva transformer has a primary side rated current of about 72 amps. You are permitted to feed it with a breaker much larger than 72 amps. But the code gives this as a maximum value.