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What size wire and breaker for a 30 hp 240 volt 3 phrase motor?
Wiki User
∙ 11y ago
A three phase 30 HP at 240 volts draws 80 amps. Motor feeders have to be rated at 125% of the motors full load amps. 80 x 125% = 100 amps.
A #
3 copper conductor with an insulation factor of 75 or 90 degrees C are rated at 100 and 105 amps respectively.
Non-time delay fusing is 225 amps, time delay fusing is 125 amps and a circuit breaker is sized by 250% x 80, the full load amps, which equals 200 amps.
Wiki User
∙ 11y ago
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