Under NEC guidelines, which type of conductors may be run in open spaces above ceilings and through wall partitions without further protection?

Under NEC guidelines, which type of conductors may be run in open spaces above ceilings and through wall partitions without further protection?

• A. High-voltage conductors
• B. Fiber optic cables
• C. Low-voltage conductors
• D. Medium-voltage conductors

Answer: (C)

Low-voltage conductors are treated differently from higher-voltage power conductors in the NEC. In open spaces above ceilings and through wall partitions, higher-voltage conductors must be protected in conduit or other raceways to guard against physical damage, noise, and fire pathways. Low-voltage circuits, such as control and communications wiring, are allowed to be run in those spaces without additional protective raceways because their energy levels and risks are much lower. Fiber optic cables aren’t conductors at all, and they follow separate installation rules. So the correct choice is low-voltage conductors, since they may be routed in open spaces and through partitions without extra protection.

Low-voltage conductors are treated differently from higher-voltage power conductors in the NEC. In open spaces above ceilings and through wall partitions, higher-voltage conductors must be protected in conduit or other raceways to guard against physical damage, noise, and fire pathways. Low-voltage circuits, such as control and communications wiring, are allowed to be run in those spaces without additional protective raceways because their energy levels and risks are much lower. Fiber optic cables aren’t conductors at all, and they follow separate installation rules. So the correct choice is low-voltage conductors, since they may be routed in open spaces and through partitions without extra protection.