What is the peak value of a three phase 480V RMS voltage?

[rrc14]

I was just wondering, and have never ran across the peak value of a 480V RMS voltage.

The peak value of a single phase 120V RMS voltage is = 120 x sqrt(2) = 170V.

What is the peak value of a three phase 480V RMS voltage? :?

Thanks,

 

[petersonra]

it is 480 * sqrt(2)

 

[rrc14]

Wouldn't that be for a single phase 480V RMS voltage? Doesn't the three phase and the overlapping voltages add to the the peak?

Thanks,

 

[GoldDigger]

Regardless of how many phases, each waveform, whether line to line or line to neutral is a sine wave. That mrsnd that the peak to RMS ratio is always 1:sqrt2.

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