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Example, 1HP, 460V, 3PH motor has an FLA=2.1. Maximum OCPD (inverse time CB) = 2.5*2.1 = 5.25A. Do I have to use a 15A CB or is there a rule that allows me to use 20A CB to protect this motor?
Petersona, "The food allows you to use the next standard size cb above 250%." ????
iwire, why does it appear I don't think 15A is allowed on commercial jobs? I just want to know if there is a rule that allows me to use 20A CB instead. I am pretty sure there is somewhere in the NEC that allows a minimum 20A CB to be used on commercial projects for receptacle branch circuits. I typically only see 20A CB on commercial projects, but I currently have a project with mixed breakers, and I want to confirm what the exact rule is when it comes to protecting motors.