Power-limited fire-protective signaling cable for use in plenums bears the marking.

Power-limited fire-protective signaling cable for use in plenums bears the marking.

• A. PLP
• B. FPPL
• C. PLFP
• D. FPLP

Answer: (D)

The marking encodes all the key ratings for a fire alarm signaling cable intended for use in air-handling spaces: fire protection, power limitation, low smoke, and plenum suitability. The sequence FPLP means Fire-protective, Power-limited, Low-smoke, Plenum-rated. This combination indicates the cable is designed to maintain performance during a fire, limits the power that can be laundered through it for safety, minimizes smoke production, and is approved for use in plenums (air ducts and other ventilation spaces). The other options either omit one of these essential attributes or don’t clearly indicate plenum suitability, so they don’t convey the full intended use and safety characteristics.

The marking encodes all the key ratings for a fire alarm signaling cable intended for use in air-handling spaces: fire protection, power limitation, low smoke, and plenum suitability. The sequence FPLP means Fire-protective, Power-limited, Low-smoke, Plenum-rated. This combination indicates the cable is designed to maintain performance during a fire, limits the power that can be laundered through it for safety, minimizes smoke production, and is approved for use in plenums (air ducts and other ventilation spaces). The other options either omit one of these essential attributes or don’t clearly indicate plenum suitability, so they don’t convey the full intended use and safety characteristics.