Fire Alarm Systems ARTICLE. Introduction to Article 760 Fire Alarm Systems. Part I. General
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1 ARTICLE 760 Fire Alarm Systems Introduction to Article 760 Fire Alarm Systems Article 760 covers the installation of wiring and equipment for fire alarm systems, including all circuits controlled and powered by the fire alarm system. These include fire detection and alarm notification, voice communications, guard s tour, sprinkler waterflow, and sprinkler supervisory systems. NFPA 72, National Fire Alarm Code provides other fire alarm system requirements. Since many people have difficulty understanding this article from the text alone, pay close attention to the illustrations as you study this material. The figures highlight important requirements and common Article 760 violations. Part I. General Scope. Article 760 covers the installation of wiring and equipment for fire alarm systems, including all circuits controlled and powered by the fire alarm system. Figure FPN No. 1: Fire alarm systems include fire detection and alarm notification, voice communications, guard s tour, sprinkler waterflow, and sprinkler supervisory systems. Other circuits that might be controlled or powered by the fire alarm system include elevator capture, elevator shutdown, door release, smoke door and damper control, fire door and damper control, and fan shutdown. NFPA 72, National Fire Alarm Code provides the requirements for the selection, installation, performance, use, testing, and maintenance of fire alarm systems. Author s Comments: Building control circuits associated with the fire alarm system, such as elevator capture and fan shutdown, must comply with Article 725 [760.3(E)]. Article 760 applies if these components are powered and directly controlled by the fire alarm system. NFPA 101 Life Safety Code or the local building code specifies when and where a fire alarm system is required. Figure Author s Comment: Residential smoke alarm systems, including interconnecting wiring, aren t covered by Article 760, because they aren t powered by a fire alarm system as defined in NFPA Definitions. Abandoned Cable. A cable that isn t terminated to equipment and not identified for future use with a tag. Author s Comment: Section requires the accessible portion of abandoned cables to be removed. Fire Alarm Circuit. The portion of the wiring system and connected equipment powered and controlled by the fire 226 Mike Holt s Illustrated Guide to Understanding the National Electrical Code, Volume 2
2 Fire Alarm Systems alarm system. Fire alarm circuits are classified as either nonpower-limited or power-limited. Power-Limited Fire Alarm Circuit. A power-limited fire alarm circuit must have the voltage and power limited by a listed power supply that complies with as follows: Figure Inherently Limited (ac) [Chapter 9, Table 12(A)] Voltage Power 0 to 20V 5.00 x V 21V to 100V 100 VA Not Inherently Limited [Chapter 9, Table 12(A)] Overcurrent Voltage Power Protection 0 to 20V 5.00 x V 5A 21 to 100V 100 VA 100/V 101 to 150V 100 VA 1A Figure Author s Comment: Inherently limited power supplies are designed to burn out if overloaded. Nonpower-Limited Fire Alarm Circuit. A nonpower-limited fire alarm circuit can operate at up to 600V, and the power output isn t limited [ and ]. Figure Other Articles. Only those sections of Article 300 specifically referenced in this section apply to fire alarm circuits and equipment and complies with (A) through (G) as follows. (A) Spread of Fire or Products of Combustion. Fire alarm circuits installed through fire-resistant-rated walls, partitions, Figure Figure Mike Holt Enterprises, Inc NEC.CODE ( ) 227
3 Fire Alarm Systems floors, or ceilings must be firestopped to limit the possible spread of fire or products of combustion in accordance with the instructions supplied by the manufacturer for the specific type of cable and construction material (drywall, brick, etc.), as required by Figure (B) Ducts, Plenums, and Other Spaces Used for Environmental (C) Hazardous (Classified) Locations. Fire alarm circuits installed in any hazardous location must be installed in accordance with Articles 500 through 516, specifically and (D) Corrosive, Damp, or Wet Locations. Fire alarm circuits installed in corrosive, damp, or wet locations must be identified for use in the operating environment [110.11]; must be of materials suitable for the environment in which they are to be installed [300.6]; and must be of a type suitable for the application [310.9]. (E) Building Control Circuits. Class 1, 2, and 3 circuits used for building controls (elevator capture, fan shutdown, etc.), associated with the fire alarm system, but not controlled and powered by the fire alarm system, must be installed in accordance with Article 725 [760.1]. (F) Optical Fiber Cables. Optical fiber cables utilized for fire alarm circuits must be installed in accordance with Article Access to Electrical Equipment Behind Panels Designed to Allow Access. Access to equipment must not be prohibited by an accumulation of cables that prevent the removal of suspended-ceiling panels. Cables must be located so that the suspended-ceiling panels can be moved to provide access to electrical equipment. Figure Air-Handling Purposes. Where necessary for direct action upon, or sensing of the contained air, fire alarm cables are permitted to be installed in ducts or plenums if they are installed in a metal raceway as required by (B). Figure Exception: Plenum-rated fire alarm cables are permitted above a suspended ceiling or below a raised floor used for environmental air [760.30(B)(1) and (2), (A), and (A)]. Nonplenum-rated fire alarm cables are permitted to be installed above a suspended ceiling or below a raised floor used for environmental air, if the cable is installed in a metal raceway [300.22(C)(1)]. Figure Mike Holt s Illustrated Guide to Understanding the National Electrical Code, Volume 2
4 Fire Alarm Systems Mechanical Execution of Work. Equipment and cabling must be installed in a neat and workmanlike manner. Author s Comment: Raceways and cables are permitted to be supported by independent support wires attached to the suspended ceiling [300.11(A) and ]. Figure Figure Exposed cables must be supported by the structural components of the building so that the cable will not be damaged by normal building use. Cables must be secured by straps, staples, hangers, cable ties, or similar fittings designed and installed in a manner that will not damage the cable. Figure Figure Cables run through or parallel to framing members or furring strips must be protected where they are likely to be penetrated by nails or screws, by installing the wiring method so Figure Figure Mike Holt Enterprises, Inc NEC.CODE ( ) 229
5 Fire Alarm Systems it isn t less than 11 4 in. from the nearest edge of the framing member or furring strips, or by protecting them with a 1 16 in. thick steel plate or equivalent [300.4(D)]. Figure Abandoned Cable. To limit the spread of fire or products of combustion within a building, the accessible portion of cable that isn t terminated at equipment and not identified for future use with a tag must be removed [760.2]. Figure circuit conductors extend beyond a building, they must be installed in accordance with Article 800, or they must be installed in accordance with Part I of Article Fire Alarm Circuit Requirements. (A) Nonpower-Limited Fire Alarm Circuits. Nonpowerlimited fire alarm (NPLFA) circuits must comply with Parts I and II of this article. Cables identified for future use must be with a tag that can Figure Figure withstand the environment involved. Figure Author s Comment: Cables installed in concealed raceways aren t considered accessible, therefore they re not required to be removed Fire Alarm Circuit Identification. Fire alarm circuits must be identified at all terminal and junction locations. The identification must be in such a manner that will help to prevent unintentional signals on the fire alarm system circuits during testing and servicing of other systems. Figure Author s Comment: The marking of raceways and cables isn t required by this section [ ] Fire Alarm Circuit Cables Extending Beyond a Building. Where twisted-pair power-limited fire alarm (B) Power-Limited Fire Alarm Circuits. Power-limited fire alarm (PLFA) circuits must comply with Parts I and III of this article. Part III. Power-Limited Fire Alarm (PLFA) Circuits Power Sources for Power-Limited Fire Alarm Circuits. (B) Branch Circuit. Power-limited fire alarm equipment must be supplied by an individual branch circuit that is not GFCI or AFCI protected. Figure Equipment Marking. Fire alarm equipment supplying power-limited fire alarm cable circuits must be 230 Mike Holt s Illustrated Guide to Understanding the National Electrical Code, Volume 2
6 Fire Alarm Systems durably marked to indicate each circuit that is a power-limited fire alarm circuit. Author s Comment: Fire alarm circuits must be marked at all terminal and junction locations [760.30] Wiring Methods on Load Side of Power- Limited Fire Alarm Power Source. (B) PLFA Wiring Methods and Materials. Power-limited fire alarm conductors and cables described in must be installed as detailed in (1), (2), or (3). (1) Exposed or Fished in Concealed Spaces. Power-limited fire alarm circuits installed exposed must be adequately supported and protected against physical damage, or be installed must be protected by a 1 16 in. thick steel plate or the equivalent [760.8]. Cable splices or terminations must be made in listed fittings, boxes, enclosures, fire alarm devices, or utilization equipment. Figure Separation from Power Conductors. (A) General. Power-limited fire alarm conductors must not be placed in any enclosure, raceway, or cable with conductors of electric light, power, or Class 1 circuits. (B) Separated by Barriers. Where separated by a barrier, power-limited fire alarm circuits are permitted with electric power conductors. Author s Comment: Separation is required to prevent a fire or Figure Figure in a raceway. Author s Comment: Exposed cables must be supported by the structural components of the building so the cable won t be damaged by normal building use. Cables must be secured by straps, staples, hangers, or similar fittings designed and installed in a manner that won t damage the cable. Cables run through or parallel to framing members or furring strips must be protected where they re likely to be penetrated by nails or screws, by installing the wiring method so it isn t less than 11 4 in. from the nearest edge of the framing member or furring strips, or it shock hazard that can occur from a short between the fire alarm circuit and the higher-voltage circuits. (D) Associated Systems Within Enclosures. Power-limited fire alarm conductors are permitted to be mixed with electric light, power, and Class 1 circuit conductors in enclosures where these other conductors are introduced solely for connection to the same equipment, and: (1) A minimum of 1 4 in. separation is maintained from the power-limited fire alarm cable conductors. Mike Holt Enterprises, Inc NEC.CODE ( ) 231
7 Fire Alarm Systems Figure (G) Other Applications. Power-limited fire alarm circuit conductors must be separated by not less than 2 in. from insulated conductors of electric light, power, or Class 1 circuits unless: (1) All of the electric light, power, and Class 1 circuit conductors, or all of the power-limited fire alarm circuit conductors, are in a raceway or in metal-sheathed, metalclad, nonmetallic-sheathed, or underground feeder cables. Figure Power-Limited Fire Alarm Circuits, Class 2, Class 3, and Communications Circuits. (A) Two or More Circuits. Power-limited fire alarm circuits, communications circuits, or Class 3 circuits are permitted to be in the same cable, enclosure, cable tray, or raceway. Figure (B) PLFA and Class 2 Circuits. Class 2 circuits are permitted to be within the same cable, enclosure, cable tray, or raceway as conductors of power-limited fire alarm circuits provided the Class 2 circuit conductor insulation isn t less than that required for the power-limited fire alarm circuit. Author s Comment: Listed Class 2 cables have a voltage rating of 150V [ (G)], whereas listed power-limited fire alarm cables have a voltage rating of 300V [ (C)]. (D) Audio System Circuits and Power-Limited Fire Alarm Circuits. Audio system circuits [640.9(C)] using Class 2 or Class 3 wiring methods must not be installed in the same Figure Figure cable, cable tray, or raceway with power-limited fire alarm conductors or cables. Author s Comment: The concern is that a fault from audio amplifier circuits to fire alarm circuits has the potential to create a hazard by disrupting the operation of fire alarm systems. However, this new restriction doesn t apply to the voice annunciation audio circuits supplied and controlled from a fire alarm 232 Mike Holt s Illustrated Guide to Understanding the National Electrical Code, Volume 2
8 Fire Alarm Systems panel and commonly required in high-rise buildings and similar applications Support. Power-limited fire alarm cables are not permitted to be strapped, taped, or attached to the exterior of any raceway as a means of support. Figure Author s Comment: Power-limited fire alarm cables identified as suitable for plenum or riser use are not required in one- or two-family dwellings Applications of Power-Limited Fire Alarm Cables (PLFA). (A) Ducts, Plenums, and Other Space Used for Environ mental Air. Where necessary for direct action upon, or sensing of the contained air, power-limited fire alarm cables are permitted to be installed in ducts or plenums if installed in a metal raceway [300.22(B)]. Power-limited fire alarm cables identified as suitable for plenum use can be installed above a suspended ceiling or below a raised floor used for environmental air. Figure Author s Comments: Power-limited fire alarm cables not identified as suitable for plenum use can be installed above a suspended ceiling or below a raised floor used for environmental air, but only if the power-limited fire alarm cables not identified as suitable for plenum use are installed in a metal raceway [300.22(C)(1)]. Fire alarm cables installed beneath a raised floor in an information technology equipment room (computer room) aren t required to be plenum-rated [300.22(D) and 645.5(D)(6)(c)]. (B) Riser. (1) Power-limited fire alarm cables installed in vertical runs penetrating more than one floor must be riser-rated Types FPLR or FPLP [ (E)]. Listed riser raceways and listed plenum signaling raceways are permitted to be installed in vertical riser runs, but only if the cables contained in these raceways are riser- or plenum-rated Types CL2R, CL3R, CL2P, or CL3P. (2) Power-limited fire alarm cables installed in vertical runs penetrating more than one floor aren t required to be riser-rated if installed within a metal raceway. Author s Comment: Metal raceways containing circuit conductors from a power-supply system that operates below 50V generally aren t required to be connected to an equipment grounding conductor [ and (I)]. (3) FPL cable is permitted for all applications in one- and two-family dwellings. Figure (C) Other Wiring Within Buildings. (1) General. Type FPL cable is permitted. (2) In Raceways. Cables are permitted to be installed in raceways. (3) Nonconcealed Spaces. Chapter 3 cables meeting the requirements of (A) and (B) can be installed in noncon cealed spaces where the exposed length of cable doesn t exceed 10 ft. (D) Cable Substitutions. Power-limited fire alarm circuit cables are permitted to be substituted in accordance with Table Part IV. Listing Requirements Listing and Marking Requirements of Power-Limited Fire Alarm Cables (PLFA). Power-limited fire alarm cable installed within buildings must be listed in accordance with (A) through (H) and must be marked in accordance with (I). Power-limited fire alarm cable used in a wet location must be listed for use in wet locations or have a moisture-impervious metal sheath. Figure Mike Holt Enterprises, Inc NEC.CODE ( ) 233
9 Fire Alarm Systems (A) Conductor Materials. Conductors must be solid or stranded copper. (B) Conductor Size. The size of conductors in a multiconductor cable must not be smaller than 26 AWG. Single conductors must not be smaller than 18 AWG. (C) Cable Voltage Rating. Power-limited fire alarm cable must have a voltage rating of 300V and this rating must not be marked on the cable [ (I)]. (D) Type FPLP. Power-limited fire alarm plenum cables (FPLP) are listed for use in ducts, plenums, and other environmental air spaces [ (A)]. Figure Figure Author s Comment: Cables identified as suitable for plenum use can be installed in environmental air spaces, but they are not permitted to be installed in ducts or plenums! See 760.3(B) in this textbook for details. (E) Type FPLR. Power-limited fire alarm riser cables (FPLR) are listed for use in a vertical run in a shaft, or from floor to floor [ (B)]. (F) Type FPL. Power-limited fire alarm cables (FPL) are listed for general-purpose use [ (C)]. (H) Coaxial Cables. Coaxial cables are listed as FPLP, FPLR, or FPL. (I) Cable Marking. The 300V rating of power-limited fire alarm cable must not be marked on the cable [ (C)]. FPN: Voltage markings on cables may suggest that the cables are suitable for Class 1, or electrical power applications, which they re not. 234 Mike Holt s Illustrated Guide to Understanding the National Electrical Code, Volume 2
10 Practice Questions Article 760 ARTICLE 760 Practice Questions Article 760 Fire Alarm Systems Practice Questions 1. Fire alarm cables that are not terminated at equipment and not identified for future use with a tag are considered abandoned. (a) True (b) False 2. Fire alarm cables identified for future use shall be marked with a tag of sufficient durability to withstand. (a) moisture (b) humidity (c) the environment involved (d) none of these 3. The power source for a nonpower-limited fire alarm circuit shall not be supplied through a(n). (a) ground-fault circuit interrupter (b) arc-fault circuit interrupter (c) inverse time circuit breaker (d) a or b 4. The number of nonpower-limited fire alarm conductors in a raceway shall not be required to comply with the fill requirements contained in (a) True (b) False 5. Cable splices or terminations in power-limited fire alarm systems shall be made in listed or utilization equipment. (a) fittings (b) boxes or enclosures (c) fire alarm devices (d) all of these 6. Audio system circuits using Class 2 or Class 3 wiring methods shall not be installed in the same cable or raceway with. (a) other audio system circuits (b) power-limited fire alarm conductors or cables (c) a or b (d) none of these 7. Power-limited fire alarm cables installed within buildings shall be as being resistant to the spread of fire. (a) marked FR (b) listed (c) identified (d) color-coded Mike Holt Enterprises, Inc NEC.CODE ( ) 235
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