The conductors, including splices and taps, in a nonmetallic surface raceway having a cover capable of being opened in place, shall not fill the raceway to more than ____% of its cross-sectional area at that point.
See answer and applicable Code reference
The correct answer is: d) 75
Article 388 covers the use, installation, and construction specifications for surface nonmetallic raceways and associated fittings. As noted in the second sentence of of Sec. 388.56, "The conductors, including splices and taps, shall not fill the raceway to more than 75% of its area at tht point."