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If the transformer is three phase the calculation is I = 30,000 / 1.73 E.

If the transformer is single phase the calculation is I = 30,000 / E.

(Where I = current and E = secondary voltage)

It is important to note the voltage in the first formula is line to line (typically how it is specified in three phase power systems), and the second formula it is line to neutral.

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Q: How many amps can a 480 to 120 vac 3KVA transformer handle?
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