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

Unused openings for circuit breakers and switches in switchboards and panelboards shall be closed using ______ or other approved means that provide protection substantially equivalent to the wall of the enclosure.

(a) duct seal and tape

(b) identified closures

(c) exothermic welding

(d) sheet metal