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
- 6. 760.21760.21 Access to Electrical EquipmentAccess to Electrical Equipment
- 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.
- 10. NPLFA Circuit MethodsNPLFA Circuit Methods
- 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.
- 18. Fire Alarm CircuitFire Alarm Circuit Integrity (CI) CableIntegrity (CI) Cable
- 19. HierarchicalHierarchical Table of SubstitutionTable of Substitution
Editor's Notes
- #3: 250=Grounding 300=Wiring Methods pg258 RB 348=Flexible Metal Conduit pg312 RB 350=Liquidtight Flexible Conduit pg 315 RB 800=Communications
- #5: Use example of notification zone that passes through another zone
- #8: Supported from structure parallel or perpendicular to building lines.
- #10: 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
- #12: Open wiring method or conduit allowed, must splice or terminate in box
- #14: Construction methods may reduce need for CI cable
- #16: 1)Protected to within 7 feet of floor, secured every 18 inches 2)in raceway unless building construction provides adequate protection 3)in conduit
- #17: 760.54 barriers, raceway within an enclosure, associated systems in enclosures, separation of conductors
- #20: Table 725.61 Cable Uses and Permitted Substitutions [see handout] Red book page 304, 305