Mike Holt's 2017 NEC Code Graphic and Question of the Day

This image is based on the 2017 NEC©

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NEC® Code Quiz Question of the Day

A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A device, is a(n) "______."

(a) dual-element fuse

(b) inverse time breaker

(c) ground-fault circuit interrupter

(d) safety switch