What does FPL stand for in alarm wiring terminology?

• A. Fully Protected Line
• B. Flexible Power Load
• C. Fire, Power Link
• D. Fire, Power Limited

Answer: (D)

FPL means Fire, Power Limited. In alarm wiring, a circuit labeled as power limited has its power supply restricted to a safe maximum, which helps limit potential energy and reduce fire risk while still delivering the necessary signaling for the fire alarm system. The “Fire” part indicates this circuit is part of a life-safety system and should meet specific code and protection requirements appropriate for fire alarm applications. This designation guides electricians on wiring practices, permissible device types, and protective measures, since power-limited circuits are treated differently from higher-energy circuits. The other phrases aren’t standard industry terms for this concept and wouldn’t convey the same safety and code implications.