What type of cable is used when running cable between floors in a multi-story building?

What type of cable is used when running cable between floors in a multi-story building?

• A. Plenum-rated
• B. Riser-rated
• C. Indoor-rated
• D. Outdoor-rated

Answer: (B)

Vertical runs between floors in a building must meet fire and smoke safety standards for the shafts they travel through. Riser-rated cable, often labeled CMR, is designed for these between-floor applications because it limits flame spread and smoke in vertical riser spaces. Plenum-rated cable is intended for air-handling plenums and is more stringent and costly, not typically required for standard vertical runs. Indoor-rated cable lacks the enhanced fire/smoke performance needed in riser shafts, and outdoor-rated is built for exterior exposure. So the suitable choice for between floors is riser-rated cable.

Vertical runs between floors in a building must meet fire and smoke safety standards for the shafts they travel through. Riser-rated cable, often labeled CMR, is designed for these between-floor applications because it limits flame spread and smoke in vertical riser spaces. Plenum-rated cable is intended for air-handling plenums and is more stringent and costly, not typically required for standard vertical runs. Indoor-rated cable lacks the enhanced fire/smoke performance needed in riser shafts, and outdoor-rated is built for exterior exposure. So the suitable choice for between floors is riser-rated cable.