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There is no kva in volts, kva stands for kilo = 1000, volt = working voltage, amps = maximum amperage draw at that voltage. eg. 1000 VA =100v at 10 amps or 200v at 5 amps. If you had a transformer that had a primary voltage of 480 volts and you need a secondary voltage at 240, with a maximum load of 5 amps, the transformer rating should be 1.2kva or 1200VA. On the premise 480V primary, amperage will be 2.5 amps. Secondary 240V, amperage will be 5 amps. 480 x 2.5 = 1.2 KVA, 240 x 5 = 1.2 KVA. Transformer size is 1200 VA or !.2 KVA.

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