NJ Fire Alarm key terms

An initiating device or notification appliance circuit that continues to operate after a single open or ground fault because the conductors run out from and back to the control unit on separate paths.

A circuit that loses all devices beyond a single break or ground fault because it runs as a single path with no redundant return conductor to the control unit.

A power-limited circuit supplied by a listed source and limited in voltage and current so it can be installed without the wiring methods required for line-voltage branch circuits.

The National Electrical Code article covering fire alarm systems, separating them into power-limited fire alarm (PLFA) and non-power-limited fire alarm (NPLFA) circuits with distinct wiring method rules.

Power-limited fire alarm circuits supplied from a listed power-limited source; they permit reduced wiring methods such as listed PLFA cable, CL3 cable, or raceway per Article 760 Part III.

Non-power-limited fire alarm circuits that are not current-limited by a listed source and therefore must follow the stricter wiring methods of Article 760 Part II, similar to Class 1 circuits.

NFPA 72 designations for notification appliance circuits: Style Y is Class B (single path) and Style Z is Class A (redundant return path), affecting survivability of the circuit after a fault.

The ability of fire alarm circuit conductors and equipment to keep functioning during a fire, achieved through circuit redundancy, 2-hour rated cable, or protection within a rated enclosure.

A listed cable assembly rated to maintain circuit integrity for a specified time under fire conditions, commonly used to meet survivability requirements for notification and control circuits.

The National Fire Alarm and Signaling Code, which sets minimum requirements for the design, installation, testing, inspection, and maintenance of fire detection and signaling systems.

The circuit wiring connecting automatic detectors and manual pull stations to the control unit, monitored for opens, grounds, and shorts so faults are annunciated.

A fire alarm architecture in which each initiating or notification device has a unique address, allowing the panel to report the exact device in alarm, trouble, or supervisory condition.

A system where devices are grouped on circuits and the panel reports only the zone or circuit in alarm, requiring field search to identify the specific device.

A defined area or group of initiating devices reported together by the control unit; NFPA 72 limits zone size by floor area and requires annunciation of the zone in alarm.

A feature that delays panel alarm processing briefly to confirm a detector signal, reducing nuisance alarms, and is prohibited on circuits with manual pull stations or certain detection types.

A programming method requiring two or more detectors in the same area to alarm before the system outputs a general alarm, used to reduce false alarms from single-detector activation.

An automatic initiating device that senses products of combustion; spot types include ionization and photoelectric, and selection depends on expected fire characteristics and ambient conditions.

The maximum distance between smoke or heat detectors and from walls, based on listed spacing and ceiling height, calculated per NFPA 72 charts with adjustments for high or sloped ceilings.

A detector installed in HVAC ductwork to sense smoke being recirculated or transported, typically arranged to shut down air handling units and often required where ducts serve specific areas.

A manually operated initiating device that a person activates to signal an alarm; it must be mounted at accessible height, near exits, and within a defined travel distance along the path of egress.

A device that senses water movement in a sprinkler system and sends an alarm signal; activation timing and retard features prevent false alarms from pressure surges.

A supervisory device that monitors the open/closed position of a sprinkler control valve so the panel annunciates a supervisory condition when the valve is not fully open.

The circuit supplying audible and visible notification appliances, designed with sufficient voltage and current to operate all devices within their listed ratings at the end of the circuit.

The measure of visible notification appliance light intensity; required rating depends on room size and mounting height, with higher candela needed in large or high-ceiling spaces.

An alarm sound output whose required sound pressure level is typically at least 15 dBA above ambient or 105 dBA at the pillow in sleeping areas, measured per code.

The reduction in voltage along a notification appliance circuit due to conductor resistance; it must be calculated so the last appliance still operates at its listed minimum voltage.

The central panel that receives initiating device signals, processes them per programmed logic, and controls notification appliances, releasing devices, and off-premises transmitters.

A listed display unit located away from the main control panel that shows alarm, trouble, and supervisory conditions to responders or building staff at an entrance or fire command area.

Batteries or another listed source that automatically power the fire alarm system when normal AC power fails, sized to carry standby and alarm loads for the code-required duration.

The documented computation of standby and alarm current draws multiplied by required time durations, plus a derating factor, to select and verify battery capacity.

The normal AC branch circuit supplying the fire alarm control unit; it must be dedicated, labeled, and connected ahead of other loads so it is not inadvertently switched off.

A signal indicating an off-normal condition in a system or device that could impair fire protection, such as a closed sprinkler valve or low air pressure, distinct from alarm and trouble.

An indication that a circuit, device, or power supply has an abnormal condition such as an open, ground, or loss of primary power that may prevent proper system operation.

The initial test performed after installation and before the system is placed in service, verifying that all devices, circuits, and functions operate as designed and documented.

A visual and physical examination of fire alarm equipment and wiring to confirm installation matches approved plans and code, performed before functional testing.

The written record of inspection and testing results, including devices tested, conditions found, and corrective actions, which must be retained and made available to the authority.

A periodic test of smoke detectors to confirm their response falls within the listed sensitivity range, using a calibrated instrument or the detector's built-in test feature.

New Jersey's statewide construction code, which adopts national model codes by reference and governs permits, inspections, and enforcement for building and fire protection work.

The portion of the New Jersey Uniform Construction Code adopting the fire prevention and building provisions applicable to fire alarm and detection installations, enforced by the local fire official.

The formal authorization issued by the local enforcing agency before fire alarm work begins; it requires submitted plans and triggers required inspections before the system may be used.

The technical examination of submitted fire alarm drawings and calculations by the enforcing agency to confirm code compliance before a permit is issued or work proceeds.

Marked-up or revised drawings showing the fire alarm system as actually installed, including device locations and circuit routing, submitted at project closeout.

The written description of how the system responds to each input, such as which alarms activate which outputs, delays, and shutdowns, used for design, testing, and approval.

A safety procedure that isolates and labels energy sources before work begins, preventing accidental energization of circuits or equipment during installation and servicing.

Protective clothing and gear such as safety glasses, gloves, and insulated tools required for tasks including battery servicing, conduit work, and electrical terminations.