The proper non-power-limited cable for riser use is which?

The proper non-power-limited cable for riser use is which?

• A. NPLFR
• B. NPLP
• C. NPLF
• D. NPLFC

Answer: (A)

Riser-rated cables are required for vertical runs between floors to limit flame spread in shafts. For fire alarm signaling circuits that aren’t power-limited, you want a cable that is both flame-retardant and specifically approved for riser use. The designation NPLFR signals non-power-limited construction with a flame-retardant jacket and riser rating, making it the proper choice for riser applications. Other options either indicate different environments (like plenum) or lack the riser rating, so they aren’t appropriate for vertical shaft runs between floors.

Riser-rated cables are required for vertical runs between floors to limit flame spread in shafts. For fire alarm signaling circuits that aren’t power-limited, you want a cable that is both flame-retardant and specifically approved for riser use. The designation NPLFR signals non-power-limited construction with a flame-retardant jacket and riser rating, making it the proper choice for riser applications. Other options either indicate different environments (like plenum) or lack the riser rating, so they aren’t appropriate for vertical shaft runs between floors.