spaces used for environmental air shall be Type NPLFR
Exception No. 1: Types NPLFR and NPLF cables installed in compliance with 300.22(C).
Exception No. 2: Other wiring methods in accordance with 300.22(C) and conductors in compliance with
760.49(C).
Exception No. 3: Type NPLFP-CI cable shall be permitted to be installed to provide a 2-hour circuit integrity rated cable.
(3) Riser. Cables installed in vertical runs and penetrating more than one floor or cables installed in vertical runs in a shaft shall be Type NPLFR. Floor penetrations requiring Type NPLFR shall contain only cables suitable for riser or plenum use.
Exception No. 1: Type NPLF or other cables that are specified in Chapter 3 and are in compliance with
760.49(C) and encased in metal raceway.
Exception No. 2: Type NPLF cables located in a fireproof shaft having firestops at each floor.
FPN: See 300.21 for firestop requirements for floor penetrations.
Exception No. 3: Type NPLF-CI cable shall be permitted to be installed to provide a 2-hour circuit integrity rated cable.
(4) Other Wiring Within Buildings. Cables installed in building locations other than the locations covered in
760.53(B)(1), (B)(2), and (B)(3) shall be Type NPLF.
Exception No. 1: Chapter 3 wiring methods with conductors in compliance with 760.49(C).
Exception No. 2: Type NPLFP or Type NPLFR cables shall be permitted.
Exception No. 3: Type NPLFR-CI cable shall be permitted to be installed to provide a 2-hour circuit integrity rated cable.
III. Power-Limited Fire Alarm (PLEA) Circuits
760.121 Power Sources for PLEA Circuits.
(A) Power Source. The power source for a power- limited fire alarm circuit shall be as specified in
760.121(A)(1), (A)(2), or (A)(3).
FPN No. 1: Tables 12(A) and 12(B) in Chapter 9 provide the listing requirements for power-limited fire alarm circuit sources.
FPN No. 2: See 210.8(A)(5), Exception, for receptacles in dwelling-unit unfinished basements that supply power for fire alarm systems.
(1) A listed PLFA or Class 3 transformer.
(2) A listed PLFA or Class 3 power supply.
(3) Listed equipment marked to identify the PLFA
power source.
FPN: Examples of listed equipment are a fire alarm control panel with integral power source; a circuit card listed for use as a PLFA source, where used as part of a listed assembly; a current-limiting impedance, listed for the purpose or part of a listed product, used in conjunction with a non-power-limited transformer or a stored energy source, for example, storage battery, to limit the output current.
(B) Branch Circuit. An individual branch circuit shall be required for the supply of the power source. This branch circuit shall not be supplied through ground- fault circuit interrupters or arc-fault circuit interrupters.
760.124 Circuit Marking. The equipment supplying PLFA circuits shall be durably marked where plainly vis- ible to indicate each circuit that is a power-limited fire alarm circuit.
FPN: See 760.130(A), Exception No. 3, where a power- limited circuit is to be reclassified as a non-power- limited circuit.