Q. Does the Code allow a single overcurrent device to provide overload, short circuit, and ground fault protection for a motor? Can you also show me an example of how to size it? (Answer based on 2011 NEC.) Find the Answer A. A motor can be protected against overload, short circuit, and ground fault by a single overcurrent device sized to the overload requirements contained in Sec. 430.32 [430.55]. Here’s a sample calculation: What size dual-element fuse is permitted to protect a ...
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