A power-limited fire alarm cable that can be used in plenums is marked as

A power-limited fire alarm cable that can be used in plenums is marked as

• A. FPLP-D
• B. FPLP-UL
• C. FPLP
• D. FPLX

Answer: (C)

In fire alarm cable markings, you learn from the label whether the cable is suitable for plenums and whether it is power-limited. The FPLP designation identifies a fire alarm cable that is both power-limited and rated for use in plenums (air-handling spaces). The plenum-rating is signaled by the ending “P,” meaning the jacket and insulation meet the low-smoke, flame‐propagation requirements for plenums. That makes it the appropriate choice for installations in air-travel spaces where such performance is required. Other markings either extend the label with a listing tag (like UL) or refer to nonstandard or different categories, which is why FPLP is the best, most direct indicator of a power-limited fire alarm cable that can be used in plenums.

In fire alarm cable markings, you learn from the label whether the cable is suitable for plenums and whether it is power-limited. The FPLP designation identifies a fire alarm cable that is both power-limited and rated for use in plenums (air-handling spaces). The plenum-rating is signaled by the ending “P,” meaning the jacket and insulation meet the low-smoke, flame‐propagation requirements for plenums. That makes it the appropriate choice for installations in air-travel spaces where such performance is required.

Other markings either extend the label with a listing tag (like UL) or refer to nonstandard or different categories, which is why FPLP is the best, most direct indicator of a power-limited fire alarm cable that can be used in plenums.