Codes and Standards (NFPA 72, NFPA 70/NEC, Oregon Fire Code)
Which document governs what
NFPA 72 is the installation, inspection, testing, and maintenance standard: Chapter 7 documentation, Chapter 10 fundamentals, Chapter 12 circuits, Chapter 14 ITM, Chapter 17 initiating devices, and Chapter 18 notification. NFPA 70 (NEC) Article 760 governs fire alarm wiring and circuit installation. The Oregon Fire Code adopts the International Fire Code with state amendments; Chapter 9 covers fire protection systems, and local fire authorities issue permits and inspect.
Core rules
- NEC 760.41 requires a dedicated branch circuit for the fire alarm control unit, protected by a 20 A overcurrent device, with the disconnect marked “FIRE ALARM CIRCUIT CONTROL.”
- Fire alarm cable types include FPL (general), FPLR (riser), and FPLP (plenum). Non-power-limited cable uses NPLF, NPLFR, or NPLFP. Use the listing that matches the circuit and the environment.
- Separate fire alarm cable from light and power conductors by at least 2 in., or use a barrier. Support exposed cable at intervals not exceeding 4.5 ft.
- The edition adopted by the authority having jurisdiction controls. Oregon amendments and local amendments can be stricter than the model code.
Worked example
A FACU is connected to a 20 A branch circuit that also feeds corridor receptacles. NEC 760.41 requires a dedicated circuit, so the installation fails. The fix is a dedicated 20 A circuit, marked at the disconnect, with no other loads. The panel’s battery and charger are not a substitute for the dedicated branch circuit.
Traps
Do not cite the NEC for testing frequency; NFPA 72 Chapter 14 controls. Do not use FPL cable in a plenum where FPLP is required. Do not assume the newest NFPA 72 edition applies until Oregon adopts it. Do not ignore local amendments.