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The V stands for volts and A is amps. If for example you have a 12kVA device and are running off a voltage of 120 volts then Amps = 12000/120 = 100. You then use the calculated amps in a wire size table to get the correct size.

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Q: How do you solve for the size of wire when the given is kva?
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What size wire 100 kva transformer?

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