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Old 03-11-2012, 02:22 PM   #1
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Sizing a motor disconnect do you go off of hp ex. A 60amp disconnect is good for a 50amp 3 phase 480volt--but the motor draws 65 amp**
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Old 03-11-2012, 05:07 PM   #2
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Article 430.110 states that a disconnect must be rated 115% of the full load current rating of the motor.
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Old 03-12-2012, 10:20 PM   #3
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Canada: 8-602, 1b, not LESS than 115% of the full load current rating of the motor it serves.
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Old 08-14-2012, 01:33 AM   #4
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Many disconnects have a HP rating, i believe they have to in order to be used on a motor actually, because of inrush current on start up etc.
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