are eliminated (see Section 760-3) and the entire circuit is

installed using the wiring methods and materials in accordance with Part B, Nonpower-Limited Fire Protective Signaling Circuits. (b) Power-Limited Wiring Methods and Materials. Power-limited circuit conductors and cables described in Sections 760-49 through 760-51 shall be installed as follows: (1) In raceway or exposed on the surface of ceiling and sidewalls or "fished" in concealed spaces. Where installed exposed, cables shall be adequately supported and terminated in approved fittings and installed in such a way that maximum protection against physical damage is afforded by building construction such as baseboards, door frames, ledges, etc. Raceways shall not be used as a means of support for power-limited fire protective signaling circuit conductors. Where located within 7 feet (2.13 m) of the floor, cables shall be securely fastened in an approved manner at intervals of not more than 18 inches (457 mm). (2) In metal raceways or rigid nonmetallic conduit where passing through a floor or wall to a height of 7 feet (2.13 m) above the floor, unless adequate protection can be afforded by building construction such as detailed in (1) above, or unless an equivalent solid guard is provided. (3) In rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, or electrical metallic tubing where installed in hoistways. ARTICLE 760 - FIRE PROTECTIVE SIGNALING SYSTEMS 70-777 Exception: As provided for in Section 620-21, Exception Nos. 1 and 2 for elevators and similar equipment. 760-49. Fire Resistance of Cables Within Buildings. Single and multiconductor power-limited fire protective signaling circuit cables installed as wiring within buildings shall be listed as being resistant to the spread of fire in accordance with Sections 760-50 and 760-51. 760-50. Listing, Marking, and Installation of Power-Limited Fire Protective Signaling Circuit Cables. Power-limited fire protective signaling circuit cables installed as wiring within buildings shall be listed as being suitable for the purpose, marked in accordance with Table 760-50, and installed in accordance with Section 760-52. The cable voltage rating shall not be marked on the cable. (FPN): Voltage ratings on cables may be misinterpreted to suggest that the cables may be suitable for Class 1, electric light and power applications. Exception No. 1: Voltage markings shall be permitted where the cable has multiple listings and voltage marking is required for one or more of the listings. Exception No. 2: Cable substitutions as provided for in Section 760-53(d) shall be considered as suitable for the purpose and shall be permitted. Table 760-50. Cable Markings Cable Type Reference Marking FPLP Power-limited fire protective Sections 760-51(d) signaling circuit plenum cable and 760-53(a) FPLR Power-limited fire protective Sections 760-51(e) signaling circuit riser cable and 760-53(b) FPL Power-limited fire protective Sections 760-51(f) signaling circuit cable and 760-53(c) (FPN No. 1): See the referenced sections for listing requirements and permitted uses. (FPN No. 2): Cable types are listed in descending order of fire resistance rating. 760-51. Listing Requirements. Power-limited fire protective signaling cables shall be listed in accordance with (a) through (c) below and, depending on the type, (d) through (g) below. (a) Conductor Materials. Conductors shall be solid copper or bunchtinned (bonded) stranded copper. Exception No. 1: Stranded copper with a maximum of 7 strands for Nos. 16 and 18 shall be permitted. Exception No. 2: Stranded copper with a maximum of 19 strands for Nos. 14 and larger shall be permitted. (b) Sizes and Number. The size and number of conductors in a cable shall meet the requirements of Table 760-51. Conductors of No. 26 shall 70-778 NATIONAL ELECTRICAL CODE only be permitted if spliced with a connector listed as suitable for No. 26 to No. 24 or larger conductors that are terminated on equipment or if the No. 26 conductors are terminated on equipment listed as suitable for No. 26 conductors. Table 760-51. Minimum Size and Number of Conductors Required in Cables Used for Power-Limited Fire Protective Signaling Circuits Size Minimum Number of Conductors in Cable 26 AWG 10 24 AWG 6 22 AWG 4 19 AWG 2 16 AWG or larger 1 (c) Ratings. The cable shall have a voltage rating of not less than 300 volts. (d) Type FPLP. Type FPLP power-limited fire alarm plenum cable shall be listed as being suitable for use in ducts, plenums, and other space used for environmental air and shall also be listed as having adequate fireresistant and low-smoke-producing characteristics. (FPN): One method of defining low-smoke-producing cable is by establishing an acceptable value of the smoke produced when tested in accordance with the Test for Fire and Smoke Characteristics of Wires and Cables, NFPA 262-1990 (ANSI) to a maximum peak optical density of 0.5 and a maximum average optical density of 0.15. Similarly, one method of defining fire-resistant cables is by establishing maximum allowable flame travel distance of 5 feet (1.52 m) when tested in accordance with the same test. (e) Type FPLR. Type FPLR power-limited fire alarm riser cable shall be listed as being suitable for use in a vertical run in a shaft or from floor to floor and shall also be listed as having fire-resistant characteristics capable of preventing the carrying of fire from floor to floor. (FPN): One method of defining fire-resistant characteristics capable of preventing the carrying of fire from floor to floor is that the cables pass the requirements of the Standard Test for Flame Propagation Height of Electrical and Optical-Fiber Cable Installed Vertically in Shafts, ANSI/UL 1666-1986. (f) Type FPL. Type FPL power-limited fire alarm cable shall be listed as being suitable for general-purpose fire alarm use, with the exception of risers, ducts, plenums, and other space used for environmental air and shall also be listed as being resistant to the spread of fire. (FPN): One method of defining resistant to the spread of fire is that the cables do not spread fire to the top of the tray in the "Vertical-Tray Flame Test" in the Reference Standard for Electrical Wires, Cables and Flexible Cords, ANSI/UL 1581-1985. Another method of defining resistant to the spread of fire is for the damage (char length) not to exceed 4 feet 11 inches (1.5 m) when performing the CSA "Vertical Flame Test - Cables in Cable Trays," as described in Test Methods for Electrical Wires and Cables, CSA C22.2 No. 0.3-M-1985. ARTICLE 760 - FIRE PROTECTIVE SIGNALING SYSTEMS 70-779 (g) Coaxial Cables. Coaxial cables shall have a minimum of No. 22 copper or 30 percent copper-covered steel center conductor, a voltage rating of not less than 300 volts, and shall be listed as a Type FPLP, FPLR, or FPL cable. 760-52. Installation of Conductors and Equipment. Conductors and cables on the load side of overcurrent protection, transformers, and current-limiting devices shall comply with (a) and (b) below. (a) Separation from Electric Light, Power, Class 1, and Nonpower- Limited Fire Protective Signaling Circuit Conductors. (1) Open Conductors. Power-limited circuit conductors shall be separated at least 2 inches (50.8 mm) from conductors of any electric light, power, Class 1, or nonpower-limited fire protective signaling circuit conductors. Exception No. 1: Where the electric light, power, Class 1, or nonpowerlimited fire protective signaling circuit conductors are in raceway or in metal-sheathed, metal-clad, nonmetallic-sheathed, or Type UF cables. Exception No. 2: Where the power-limited circuit conductors are permanently separated from the conductors of the other circuits by a continuous and firmly fixed nonconductor, such as porcelain tubes or flexible tubing in addition to the insulation on the wire. (2) In Cables, Compartments, Enclosures, Outlet Boxes, or Raceways. Power-limited circuit conductors shall not be placed in any cable, compartment, enclosure, outlet box, raceway, or similar fitting containing conductors of electric light, power, Class 1, or nonpower-limited fire protective signaling circuit conductors. Exception No. 1: Where the conductors of the different circuits are separated by a barrier. Exception No. 2: Conductors in compartments, enclosures, outlet boxes, or similar fittings where electric light, power, Class 1 circuit, or nonpower-limited circuit conductors are introduced solely to connect to the equipment connected to the power-limited fire protective signaling system or to other circuits controlled by the fire protective signaling system to which the other conductors in the enclosure are connected. The electric light, power, Class 1, and nonpower-limited fire protective signaling circuit conductors shall be routed within the enclosure to maintain a minimum 0.25-inch (6.35-mm) separation from the conductors of power-limited fire protective signaling circuits. (3) In Shafts. Power-limited circuit conductors shall be separated by not less than 2 inches (50.8 mm) from electric light, power, Class 1, or nonpower-limited fire protective signaling circuit conductors run in the same shaft. Exception No. 1: Where the conductors of either the electric light, power, Class 1, the nonpower-limited fire protective signaling circuits, or the power-limited fire protective signaling circuits are encased in metal raceways. 70-780 NATIONAL ELECTRICAL CODE Exception No. 2: Where the electric light, power, Class 1, or the nonpower-limited fire protective signaling circuit conductors are in a raceway or are in metal-sheathed, metal-clad, nonmetallic-sheathed, or Type UF cables. (4) In Hoistways. Power-limited circuit conductors shall be installed in rigid metal conduit, intermediate metal conduit, or electrical metallic tubing in hoistways. Exception: As provided for in Section 620-21, Exception Nos. 1 and 2 for elevators and similar equipment. (b) Conductors of Different Power-Limited Fire Protective Signaling Circuits, Class 2, Class 3, and Communications Circuits in Same Cable, Enclosure, or Raceway. (1) Cables and conductors of two or more power-limited fire protective signaling circuits, communications circuits, or Class 3 circuits shall be permitted in the same cable, enclosure, or raceway. (2) Conductors of one or more Class 2 circuits shall be permitted within the same cable, enclosure, or raceway with conductors of powerlimited fire protective signaling circuits, provided that the insulation of the Class 2 circuit conductors in the cable, enclosure, or raceway is at least that required by the power-limited fire protective signaling circuits. 760-53. Applications of Listed Power-Limited Fire Protective Signaling Circuit Cables. Power-limited fire protective signaling circuit cables shall comply with (a) through (c) or, where cable substitution is being made, (d) below. (a) Plenum. Cables installed in ducts, plenums, and other spaces used for environmental air shall be Type FPLP. Exception: Types FPLP, FPLR, and FPL cable installed in compliance with Section 300-22. (b) Riser. Cables installed in vertical runs and penetrating more than one floor or cables installed in vertical runs in a shaft shall be Type FPLR. Floor penetrations requiring Type FPLR shall contain only cables suitable for riser or plenum use. Exception No. 1: Where the cables are encased in metal raceway or are located in a fireproof shaft having firestops at each floor. Exception No. 2: Type FPL in one- and two-family dwellings. (FPN): See Section 300-21 for firestop requirements for floor penetrations. (c) Other Wiring Within Buildings. Cables installed in building locations other than the locations covered in (a) and (b) above shall be Type FPL. Exception No. 1: Where the cables are enclosed in raceway. Exception No. 2: Cables specified in Chapter 3 that meet the requirements of Sections 760-51(a) and (b) and are installed in nonconcealed spaces where the exposed length of cable does not exceed 10 feet (3.05 m). ARTICLE 760 - FIRE PROTECTIVE SIGNALING SYSTEMS 70-781 (d) Cable Substitutions. The substitutions for power-limited fire protective signaling circuit cables listed in Table 760-53 and illustrated in Figure 760-53 shall be permitted. Communications and Class 3 cables shall be permitted to substitute for power-limited fire protective signaling circuit cables only where the requirements of Sections 760-51(a), (b), and (c) for multiconductor cables and Section 760-51(g) for coaxial cables are satisfied. Table 760-53. Cable Substitutions Cable Type Permitted Substitutions FPLP MPP, CMP, CL3P FPLR MPP, CMP, FPLP, CL3P, MPR, CMR, CL3R FPL MPP, CMP, FPLP, CL3P, MPR, CMR, CL3R, FPLR, MPG, MP, CMG, CM, PLTC, CL3 (FPN): For information on multipurpose cables (MPP, MRP, MPG, MP) and communications cables (CMP, CMR, CMG, CM), see Section 800-50. For information on Class 3 cables (CL3P, CL3R, CL3, PLTC), see Section 725-50. MPP CMP CL3P FPLP CL2P Plenum MPR CMR CL3R FPLR CL2R Riser MPG CMG MP PLTC CM CL3 FPL General CL2 Purpose A B CMX CL3X Cable A Shall be Permitted Dwellings to be Used in CL2X Place of Cable B Type CM - Communications Wires and Cables A B Cable A Types CL2 and CL3 - Class 2 and Class 3 Remote-Control, Shall be Permitted Signaling, and Power-Limited Cables to be Used in Type FPL - Power-Limited Fire Protective Signaling Cables Place of Cable B with Restrictions. Type MP - Multipurpose Cables See Sec. 760-51 Type PLTC - Power-Limited Tray Cable (a), (b), and (g) Figure 760-53. Cable Substitution Hierarchy 70-782 NATIONAL ELECTRICAL CODE 760-55. Current-Carrying Continuous Line-type Fire Detectors. (a) Application. Listed continuous line-type fire detectors, including insulated copper tubing of pneumatically operated detectors, employed for both detection and carrying signaling currents shall be permitted to be used in circuits having power-limiting characteristics in accordance with Section 760-21. (b) Insulation. Insulated continuous line-type fire detectors shall be listed as being resistant to the spread of fire in accordance with the requirements of Sections 760-49 and 760-50, have a voltage rating of not less than 300 volts, and the jacket compound shall have a high degree of abrasion resistance. (c) Installation. Continuous line-type fire detectors shall be installed in accordance with Sections 760-22 through 760-28 and Section 760-52.