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Thread: Sizing Multiple motors

  1. #1
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    Sizing Multiple motors

    I have 5 evap coolers on roof name plate is 10 hp 460 3phase 12.2 amps. I want to make sure I’m calculating my feeders to Panel board on roof to feed all five motors. FLC table in nec 430.6(a)(1) 10HP 460 volt is 14amp. Calculations I did like this 14 amps x1.25=17.5. I got 4 more moters at 14 amps @100%. 4x14=56 amps. 17.5x56=73.5 amps. 80 amp breaker, #4cu or #2Al, I’m planning on running to each moter 3 pole 20 amp breaker, number 10 awg cu in 3/4 emt on roof .3 current carrying conductors in each 3/4 emt

  2. #2
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    Roger
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