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You have a 3-phase UPS consuming 60kVA at 400V,

So, to determine the current per phase, apply the following formula:

I= S / (U x sqrt[3]) where S is apparent power (in VA)

U is line voltage (in V)

I is current per phase (in A)

thus, this gives I= 60 000/ (400 x sqrt[3])

I=86.6 amps

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