Which statement about riser cables is true?

Which statement about riser cables is true?

• A. Designed For Outdoor Use Only.
• B. Designed For Plenum Spaces.
• C. Designed For Non-Plenum Vertical Spaces Such As Between Floors.
• D. Not Rated For Fire Retardancy.

Answer: (C)

Riser cables are rated for vertical runs between floors, such as in shafts or chases, where a fire could quickly move upward. In those non-plenum vertical spaces, the goal is to slow flame spread and limit smoke, so the cables are designed for that specific setting. Plenum spaces, which are air-handling corridors, require even stricter performance (plenum-rated) due to high air flow, so cables intended for plenums are a separate rating and not what riser cables use. Outdoor use is not the defining factor here, and fire-retardant properties are part of the riser rating to meet safety codes. Therefore, the true statement is that riser cables are designed for non-plenum vertical spaces such as between floors.

Riser cables are rated for vertical runs between floors, such as in shafts or chases, where a fire could quickly move upward. In those non-plenum vertical spaces, the goal is to slow flame spread and limit smoke, so the cables are designed for that specific setting. Plenum spaces, which are air-handling corridors, require even stricter performance (plenum-rated) due to high air flow, so cables intended for plenums are a separate rating and not what riser cables use. Outdoor use is not the defining factor here, and fire-retardant properties are part of the riser rating to meet safety codes. Therefore, the true statement is that riser cables are designed for non-plenum vertical spaces such as between floors.