Installing Type NM Cables in Unfinished Spaces

Where Type NM cable is run at angles with joists in unfinished basements and crawl spaces, it is permissible to secure cables not smaller than _____ conductors directly to the lower edges of the joist.

a) two 6 AWG
b) three 8 AWG
c) three 10 AWG
d) a or b

See answer and applicable Code reference

The correct answer is: d) a or b

The installation requirements for nonmetallic-sheathed cable (Types NM, NMC and NMS) can be found in Article

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