NEC Article 760: Fire Alarm Systems — Complete Checklist & Field Guide (2017)

Why this guide? Article 760 of the 2017 National Electrical Code (NEC) governs the installation of wiring
and equipment for fire alarm systems, including all circuits powered and controlled by the fire alarm
system. This post turns the code into a practical, field-ready checklist with AHJ expectations, common pitfalls, and
documentation tips. Coordinate with NFPA 72 for performance, monitoring for integrity, and survivability.

Printable / Interactive Checklist Table
Quick Checklist (Clause‑by‑Clause)
Detailed Explanations & Field Notes
Submittal Documentation Package
Commissioning & Inspection Steps
FAQs

Printable / Interactive Checklist Table

Use this table during design reviews, site walks, and inspections. Tick Yes/No/N/A, add notes, and record photo/evidence IDs.

#	NEC 2017 Clause	Requirement (What to Verify)	Field Status
1	760.1	Scope: Article 760 applies to wiring/equipment of fire alarm systems and all circuits powered and controlled by the system.	Yes No N/A
2	760.2	Definitions understood: PLFA, NPLFA, Abandoned Fire Alarm Cable, Fire Alarm Circuit Integrity (CI) Cable, etc.	Yes No N/A
3	760.3	Other Articles: Apply related requirements where referenced (e.g., Ch. 3 wiring methods; Ch. 5 hazardous locations).	Yes No N/A
4	Part II	NPLFA (Non‑Power‑Limited Fire Alarm) — identify where NPLFA is used vs PLFA; verify wiring, protection, and separation rules.	Yes No N/A
5	760.43	NPLFA Overcurrent Protection — devices sized/located correctly.	Yes No N/A
6	760.45	NPLFA Overcurrent Device Location — as required by Article 760.	Yes No N/A
7	760.46	NPLFA Wiring — compliant wiring methods and workmanship.	Yes No N/A
8	760.48	Different Circuits in Same Cable/Enclosure/Raceway — comply with mixing rules and barrier/separation provisions.	Yes No N/A
9	760.49	NPLFA Conductors — size/insulation/material per code.	Yes No N/A
10	760.51	Number of Conductors & Ampacity Adjustment in trays/raceways — apply derating where required.	Yes No N/A
11	760.53	Multiconductor NPLFA Cables — proper cable type and applications.	Yes No N/A
12	Part III	PLFA (Power‑Limited) — identify PLFA sources, branch circuits, and downstream methods.	Yes No N/A
13	760.121	PLFA Power Sources — listed PLFA/Class 3 transformer or power supply, or listed equipment marked for PLFA source.	Yes No N/A
14	760.121(B)	Branch Circuit — dedicated, red‑identified disconnect, not GFCI/AFCI protected; OCPD location permanently identified at FACU.	Yes No N/A
15	760.124	Circuit Marking — supply equipment plainly marked to indicate PLFA circuits.	Yes No N/A
16	760.127	Supply‑Side Wiring — supply side of PLFA source installed per Part II and Ch. 1–4; devices supplied from power‑supply conductors OCPD ≤ 20 A.	Yes No N/A
17	760.130	Load‑Side Wiring — wiring methods/materials for PLFA and associated NPLFA on load side as specified.	Yes No N/A
18	760.133	Installation in enclosures, trays, raceways, cable routing assemblies — PLFA conductors/equipment installed per section.	Yes No N/A
19	760.135	Installation of PLFA Cables in Buildings — listing and location rules (ducts for environmental air, plenums, risers, dwellings, other spaces, portable FA).	Yes No N/A
20	760.136	Separation from power, Class 1, NPLFA, and broadband circuits — meet separation/barrier rules; special cases (single opening, hoistways, etc.).	Yes No N/A
21	760.139	Conductors of Different PLFA Circuits — mixing rules and identification maintained.	Yes No N/A
22	760.145	Current‑Carrying Continuous Line‑Type Fire Detectors — application and installation rules observed, where used.	Yes No N/A
23	760.154	Applications of Listed PLFA Cables — apply FPLP/FPLR/FPL per space (plenum/riser/general) and permitted raceways/routing/trays.	Yes No N/A
24	760.176	Listing/Marking of NPLFA Cables — types NPLFP (plenum), NPLFR (riser), NPLF (general), CI options and markings.	Yes No N/A
25	760.179	Listing/Marking of PLFA Cables & Line‑Type Detectors — types FPLP/FPLR/FPL, CI options, coax, marking requirements.	Yes No N/A

Quick Checklist (Clause‑by‑Clause)

760.1–760.3 — Scope, definitions, and cross‑references to other articles.
Part II (NPLFA) — Overcurrent protection/location (760.43/760.45), wiring (760.46), mixing (760.48), conductors (760.49), ampacity/derating (760.51), multiconductor cables (760.53).
Part III (PLFA) — Power sources (760.121), branch circuit rules (760.121(B)), marking (760.124), supply‑/load‑side methods (760.127/760.130), installation in enclosures/routing/trays (760.133), building applications (760.135), separation (760.136), different PLFA circuits (760.139), line‑type detectors (760.145).
Listing/Marking — NPLFA (760.176) and PLFA (760.179) cable types and CI options; Applications table 760.154 for FPLP/FPLR/FPL by space.

Detailed Explanations & Field Notes

Scope & Definitions (760.1, 760.2)

Article 760 covers wiring/equipment of fire alarm systems and all circuits powered and controlled by the system (e.g., elevator
recall/shutdown, smoke/fire doors, fan shutdown) when those functions are powered and controlled by the fire alarm system. Single‑
and multiple‑station smoke alarms on 120‑V branch circuits are outside Article 760. Coordinate terminology: PLFA vs NPLFA,
abandoned cable, and CI cable.

NPLFA (Part II)

Non‑power‑limited fire alarm circuits follow wiring/overcurrent rules closer to power circuits. Verify overcurrent protection, location
of devices, mixing limits with other circuits, derating when sharing raceways/trays, and allowable conductors/cables for NPLFA.

PLFA (Part III)

Power Sources & Branch Circuit: Use listed PLFA/Class 3 source or listed equipment; dedicate the branch circuit, provide a red‑identified disconnect accessible only to qualified personnel; no GFCI/AFCI; identify OCPD at the FACU.
Supply‑ vs Load‑Side: On the supply side of the PLFA source, apply Part II/Ch. 1–4; on the load side, use permitted wiring methods and materials for PLFA.
Installation & Separation: Follow rules for enclosures, trays, raceways, cable routing assemblies, and in‑building locations (ducts for environmental air, plenums, risers, dwellings, nonconcealed spaces, etc.). Maintain required separations from power/Class 1/NPLFA/broadband circuits; use barriers where allowed.

PLFA Cable Applications (760.154)

Use FPLP in plenums/air‑handling spaces and permitted raceways/routing; FPLR in risers/vertical runs; FPL in general spaces.
See the applications table for trays, raceways, and substitutions. CI‑rated variants (e.g., FPLP‑CI/FPLR‑CI/FPL‑CI) are for
circuit‑integrity use when specified by the design/AHJ.

Listing & Marking (760.176, 760.179)

Confirm listing/marking for NPLFA and PLFA cables respectively, including CI options and coax where applicable. Verify cable
markings, manufacturer instructions, and substitution hierarchy per 760.154(a).

Submittal Documentation Package

Product data & listing: FACU, power supplies, PLFA/NPLFA cables (FPLP/FPLR/FPL and CI variants), line‑type detectors, routing/raceways.
Branch circuit schedule and one‑line showing dedicated supply, OCPD identification at FACU, and red‑identified disconnect.
Wiring method details (supply vs load side), separation/barrier details (760.136), tray/raceway fill & derating calculations.
PLFA cable application matrix by space (plenum/riser/general) and any substitutions per 760.154(a).
As‑built drawings; labeling/marking photos; O&M manuals; test/commissioning reports.

Commissioning & Inspection Steps

Confirm circuits are correctly classified (PLFA vs NPLFA) and governed by Article 760.
Verify PLFA power sources and dedicated branch circuit with proper identification and disconnect.
Check wiring methods on supply/load sides; inspect workmanship and protection from damage.
Review separation from power/Class 1/NPLFA/broadband; barriers or dedicated raceways as required.
Verify cable types vs space (FPLP/FPLR/FPL) and any CI requirements; confirm substitutions per 760.154(a).
Apply ampacity adjustment/derating where multiple conductors share trays/raceways.
Document with photos, update as‑builts, and deliver O&M/closeout package.

FAQs

What’s the difference between PLFA and NPLFA?
PLFA circuits are limited in power by the source/listing and have unique wiring/separation rules. NPLFA circuits follow rules more
akin to Class 1/power wiring for protection and methods.

Which cable type do I need in a plenum?
Use FPLP (or CI variant) for plenums/air‑handling spaces, or permitted raceway/routing assemblies per 760.154 and 760.135.

Can the FACU branch circuit be on a GFCI or AFCI?
No. The dedicated branch circuit shall not be supplied through GFCI or AFCI; identify the OCPD at the FACU and provide a red‑identified disconnect accessible only to qualified personnel (760.121(B)).

Code basis: NEC 2017, Article 760. Coordinate with NFPA 72 for installation/monitoring for integrity and survivability requirements.