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

Enclosures for switches or overcurrent devices are allowed to have conductors feeding through where the wiring space at any cross section is not filled to more than _____ percent of the cross-sectional area of the space.

(a) 20

(b) 30

(c) 40

(d) 60