Installing Type AC Cable in Accessible Attic Spaces

When Type AC cable is run across the top of a floor joist in an attic without permanent ladders or stairs, substantial guard strips within _____ of the scuttle hole, or attic entrance, shall protect the cable.

a) 3 ft
b) 4 ft
c) 5 ft
d) 6 ft

See answer and applicable Code reference

The correct answer is: d) 6 ft

Article 320 covers the use, installation, and construction specifications for armored cable, Type AC. As noted in 320.23(A),