One of the most essential factors to consider when purchasing a fire alarm cable is the fire rating. There are three key fire safety ratings to consider: FPL, FPLR, and FPLP. While NEC Article 760 explains what a power-limited cable is. The fire alarm cable is tested and certified by UL, which specifies its applications and fire safety requirements.

FPL — FPL cable is ideal for general-purpose applications but should not be installed in air ducts, plenum spaces, riser closets, or any other place where environmental airflow occurs. These cables are fire resistant and have passed both the UL 1424 and the vertical flame test 1581.

FPLR — Riser-rated fire alarm wire is suited for vertical runs in elevator shafts as well as floor-to-floor paths. These cables feature fire-resistant properties, such as the capacity to self-extinguish and emit little harmful smoke. They keep the fire from spreading from floor to floor. Riser cables need to pass the UL 1424 and 1666 vertical riser tests.

FPLP – Plenum-rated fire alarm wire is intended for use in plenum spaces, air ducts, and other places with high ambient airflow. When burned, they self-extinguish and produce a minimal amount of hazardous chemicals and smoke. These cables are UL 1424 and Steiner tunnel test 910 compliant.