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Nonmetallic cable trays shall be made of flame-retardant material.
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(D) Communications Systems, Cable Trays
Wires and cables and communications raceways shall be permitted to be installed in metal or listed nonmetallic cable tray systems. Ladder cable trays ...
(C) Special Equipment, Wiring Methods
raceways or metal or nonmetallic cable trays. If metal conduit, cable tray, armored cable, or similar metallic systems are used, they shall ...