NUCC larger than _____ shall not be used.
a) trade size 1
b) trade size 2
c) trade size 3
d) trade size 4
See answer and applicable Code reference
The correct answer is: d) trade size 4
Article 354 covers the use, installation, and construction specifications for nonmetallic underground conduit with conductors (NUCC). As noted in Sec. 354.20(B), "NUCC larger than metric designator 103 (trade size 4) shall not be used."