Strut-Type Channel Raceway

A strut-type channel raceway shall not be installed _____.

a) in concealed locations
b) where subject to corrosive influences, if enamel is the only protection from corrosion of ferrous channel raceways and fittings
c) a or b
d) none of the above

See answer and applicable Code reference

The correct answer is: c) a or b

Article 384 covers the use and installation of strut-type channel raceway. As noted in Sec. 384.12, "Strut-type channel raceways shall not be used as follows:
1) Where concealed
2) Ferrous channel raceways and fittings protected from corrosion solely by enamel shall not be permitted where subject to sever corrosive influences."