According to Sec. 334.15(B), "Cable shall be protected from physical damage where necessary by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Schedule 80 PVC conduit, ...
Explanation: Section 334.30 requires NM cable to be supported AND secured at intervals not exceeding 4-1/2 ft. The trusses would provide support but not the required securing thus staples would be ...
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