I have an 8.5kw 3 phase 415 volt motor.How do i work out the amps?

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I have an 8.5kw 3 phase 415 volt motor.How do i work out the amps?

the motor is for a sewage pumping station.

2006-06-20 13:14:25 · 3 answers · asked by Me M 1 in Science & Mathematics ➔ Engineering

3 answers

8.5x1000=8500 watts. 415 volts. W=V*A A=W/V

so 8500watts/415 volts =20.48... Amps

this is the basic relationship between watts volts and amps. I dont know if the 3 phase motor part would change that answer.

2006-06-20 13:20:08 · answer #1 · answered by Brainy Buddah 2 · 0⤊ 0⤋

I = kW / PF x E x 1.73

A = 8500/.8 x 415 x 1.73

= 14.8 amps

This is assuming a power factor of .8 which is typical for a squirrel cage motor of this size.

2006-06-21 01:37:33 · answer #2 · answered by Bazza66 3 · 0⤊ 0⤋

Dont forget - RMS volts leads to RMS amps.

2006-06-20 13:26:24 · answer #3 · answered by none2perdy 4 · 0⤊ 0⤋