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Fire basics 1-2-the_nec_11
1. Fire Alarm SystemFire Alarm System
FundamentalsFundamentals
Why do we install fire alarm systems?Why do we install fire alarm systems?
Fire alarm systems classificationFire alarm systems classification
Fire alarm system componentsFire alarm system components
Electrical requirementsElectrical requirements
Riser diagramRiser diagram
Design fundamentalsDesign fundamentals
Codes and standardsCodes and standards
2. NFPA 70 Article 760NFPA 70 Article 760
• Divided into 3 partsDivided into 3 parts
– Part 1 and 2; non-power limitedPart 1 and 2; non-power limited
– Part 3; power limitedPart 3; power limited
• References to other articlesReferences to other articles
– 250, 300, 348, 350, 800, …250, 300, 348, 350, 800, …
• Wiring methods and exceptionsWiring methods and exceptions
• CI CableCI Cable
• Hierarchical table of substitutionsHierarchical table of substitutions
Electrical RequirementsElectrical Requirements
8. NPLFA Circuit Power SourceNPLFA Circuit Power Source
RequirementsRequirements
The power source of non-power-The power source of non-power-
limited fire alarm circuits shalllimited fire alarm circuits shall
comply with Chapters 1 through 4comply with Chapters 1 through 4
and the output shall not be moreand the output shall not be more
than 600 volts, nominal. Thesethan 600 volts, nominal. These
circuits shall not be suppliedcircuits shall not be supplied
through ground-fault circuitthrough ground-fault circuit
interrupters.interrupters.
14. Power-Limited Sources for PLFAPower-Limited Sources for PLFA
CircuitsCircuits
(A)(A) TRANSFORMERS. A listed PLFA orTRANSFORMERS. A listed PLFA or
Class 3 transformer.Class 3 transformer.
(B)(B) POWER SUPPLIES. A listed PLFAPOWER SUPPLIES. A listed PLFA
or Class 3 power supply.or Class 3 power supply.
(C)(C) LISTED EQUIPMENT. ListedLISTED EQUIPMENT. Listed
equipment marked to identify theequipment marked to identify the
PLFA power source.PLFA power source.
15. PLFA Wiring Methods andPLFA Wiring Methods and
MaterialsMaterials
(1). Exposed or Fished in Concealed(1). Exposed or Fished in Concealed
SpacesSpaces
(2). Passing Through a Floor or Wall(2). Passing Through a Floor or Wall
(3). In Hoistways(3). In Hoistways
16. Installation of Conductors andInstallation of Conductors and
Equipment in Cables, Compartments,Equipment in Cables, Compartments,
Cable Trays, Enclosures, Manholes,Cable Trays, Enclosures, Manholes,
Outlet Boxes, Device Boxes, andOutlet Boxes, Device Boxes, and
Raceways for Power-Limited CircuitsRaceways for Power-Limited Circuits
Conductors and equipment for power-Conductors and equipment for power-
limited fire alarm circuits shall belimited fire alarm circuits shall be
installed in accordance with 760.136installed in accordance with 760.136
through 760.143.through 760.143.
Use example of notification zone that passes through another zone
Supported from structure parallel or perpendicular to building lines.
24output/120 input x 25[14AWG]=5amp (overcurrent protection device on input side)
Overcurrent devices shall be located where the conductor to be protected receives its supply=760.24
Open wiring method or conduit allowed, must splice or terminate in box
Construction methods may reduce need for CI cable
1)Protected to within 7 feet of floor, secured every 18 inches 2)in raceway unless building construction provides adequate protection 3)in conduit
760.54 barriers, raceway within an enclosure, associated systems in enclosures, separation of conductors
Table 725.61 Cable Uses and Permitted Substitutions [see handout] Red book page 304, 305
