Fire Alarm System Fire 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

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

Section 760.2Section 760.2

760.21760.21Access to Electrical EquipmentAccess to Electrical Equipment

NPLFA Circuit Power Source NPLFA Circuit Power Source RequirementsRequirements

The power source of non-power-The power source of non-power-limited fire alarm circuits shall limited fire alarm circuits shall comply with Chapters 1 through 4 comply with Chapters 1 through 4 and the output shall not be more and the output shall not be more than 600 volts, nominal. These than 600 volts, nominal. These circuits shall not be supplied circuits shall not be supplied through ground-fault circuit through ground-fault circuit interrupters.interrupters.

NPLFA Circuit MethodsNPLFA Circuit Methods

Power-Limited Sources for PLFA Power-Limited Sources for PLFA CircuitsCircuits

(A)(A) TRANSFORMERS. A listed PLFA or TRANSFORMERS. A listed PLFA or Class 3 transformer.Class 3 transformer.

(B)(B) POWER SUPPLIES. A listed PLFA POWER SUPPLIES. A listed PLFA or Class 3 power supply.or Class 3 power supply.

(C)(C) LISTED EQUIPMENT. Listed LISTED EQUIPMENT. Listed equipment marked to identify the equipment marked to identify the PLFA power source.PLFA power source.

PLFA Wiring Methods and PLFA Wiring Methods and MaterialsMaterials

(1). Exposed or Fished in Concealed (1). Exposed or Fished in Concealed Spaces Spaces

(2). Passing Through a Floor or Wall(2). Passing Through a Floor or Wall(3). In Hoistways(3). In Hoistways

Installation of Conductors and Installation of Conductors and Equipment in Cables, Compartments, Equipment in Cables, Compartments, Cable Trays, Enclosures, Manholes, Cable Trays, Enclosures, Manholes,

Outlet Boxes, Device Boxes, and Outlet 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 be limited fire alarm circuits shall be installed in accordance with 760.136 installed in accordance with 760.136 through 760.143.through 760.143.

Fire Alarm CircuitFire Alarm CircuitIntegrity (CI) CableIntegrity (CI) Cable

HierarchicalHierarchicalTable of SubstitutionTable of Substitution