Power-limited fire alarm cable marked for risers?

• A. FPLP
• B. FPLR
• C. FPL
• D. FP

Answer: (B)

In fire alarm cabling, the environment where the cable is permitted to run is shown by the rating suffixes. Power-limited fire alarm cables use a base designation, and adding letters indicates where that cable is approved to be installed. The suffix that denotes a riser-rated cable is the one that signals it’s allowed to run in vertical shafts between floors.

Riser-rated cables are designed to limit flame spread and meet specific fire-stop requirements in vertical runs, where cables travel between stories. So the designation that includes the riser suffix indicates it’s specifically approved for those vertical pathways. That’s why this option is the best choice for a cable marked for risers.

The plenum suffix would indicate suitability for air-handling spaces, which is a different environment, and a plain FPL without the riser suffix isn’t explicitly identifying riser suitability.