760 – Fire Alarm Systems

760.121(B) – Fire Alarm Circuit Disconnect for Power-Limited Fire Alarm (PLFA) Circuits

Change at a Glance:

New sentence added to permit the fire alarm branch-circuit disconnecting means for Power Limited Fire Alarm (PLFA) circuits to be secured in the “on” position.

760.121 Power Sources for PLFA Circuits. (Fire Alarm Systems)

(B) Branch Circuits. The branch circuit supplying the fire alarm equipment(s) shall supply no other loads. The location of the branch-circuit overcurrent protective device shall be permanently identified at the fire alarm control unit. The circuit disconnecting means shall have red identification, shall be accessible only to qualified personnel, and shall be identified as “FIRE ALARM CIRCUIT.” The red identification shall not damage the overcurrent protective devices or obscure the manufacturer’s markings. This branch circuit shall not be supplied through ground-fault circuit interrupters or arc-fault circuit interrupters. The fire alarm branch-circuit disconnecting means shall be permitted to be secured in the “on” position.