MA Fire Alarm key terms

Massachusetts regulation that adopts and amends the model fire and building codes for the Commonwealth, including when fire alarm systems must be installed and how they must be maintained.

A Massachusetts business credential authorizing a company to contract for the installation, alteration, servicing, and maintenance of fire alarm systems, with a licensed technician responsible for the work.

An individual Massachusetts credential, obtained by examination, that lets a person install, service, and test fire alarm systems while employed by a licensed contractor, with renewal tied to continuing education.

Written local approval required before fire alarm installation or alteration begins in many Massachusetts communities, letting the fire department track the project and schedule inspections and the acceptance test.

The National Fire Alarm and Signaling Code; the model standard governing design, installation, inspection, testing, and maintenance of detection, alarm, and emergency communication systems, referenced by Massachusetts regulations.

The article of NFPA 70 covering fire alarm systems, setting rules for power-limited and non-power-limited circuits, permitted cable types such as FPL, and installation methods for fire alarm wiring.

The Life Safety Code; a model code that assigns detection, alarm, and egress requirements by occupancy type, helping designers decide which fire alarm features a given building needs.

Described in a nationally recognized testing laboratory's published directory after the product passed that laboratory's tests for its intended fire alarm use, typically Underwriters Laboratories.

The person or agency with legal authority to enforce code and approve fire alarm installations; in Massachusetts this is usually the local fire chief, fire prevention officer, or state fire marshal's designee.

A fire alarm configuration in which the control unit cannot identify individual devices; it reports alarm or trouble by circuit or zone, so responders must search the area to find the activated device.

A system in which every initiating device and module has a unique address, so the control unit displays the exact device and location that is in alarm, trouble, or supervisory condition.

The output of the control unit indicating that fire or another emergency has been detected, which causes notification appliances in the designated areas to sound and flash.

A signal showing that a system component is off-normal in a way that may reduce protection but does not indicate fire, such as a closed sprinkler valve or low air pressure on a dry system.

A signal indicating a fault in the alarm system itself, such as open or grounded wiring, lost primary power, a removed device, or a failed circuit card, that could prevent it from working.

An initiating device that senses combustion particles and signals the control unit; photoelectric units respond to visible smoke, ionization units to smaller particles from flaming fires.

A device that responds to abnormal temperature, either by reaching a fixed setpoint, by a rapid rate of rise, or both; used where smoke detectors would nuisance alarm.

A detector that samples air moving through an HVAC duct and, on sensing smoke, sends an alarm that typically shuts down the air handler to limit smoke spread.

A hand-operated initiating device, installed along exit paths and near exits at code-specified heights and spacing, that anyone can pull to transmit an alarm signal.

A device that senses water moving in a sprinkler pipe after a head operates and sends an alarm, usually after a delay to avoid false alarms from pressure surges.

A supervisory device that watches the position of a sprinkler control valve and reports to the control unit when the valve is moved from its fully open position.

An addressable interface that connects conventional devices or dry contacts to the signaling line circuit so each monitored point is individually identified at the control unit.

The output circuit that powers and controls horns, strobes, and speakers; it is supervised so that opens, shorts, and grounds are reported as trouble conditions.

The unit for rating how much light a visible notification appliance produces; required ratings depend on room size, mounting height, and whether the space is sleeping or public.

The loudness of audible notification, measured in decibels; code requires it to exceed average ambient sound by a margin and to reach minimums in occupiable and sleeping areas.

How well occupants can understand voice messages from an emergency communication system, measured by a recognized speech intelligibility metric and required by NFPA 72 for voice systems.

A system using speakers and voice messages instead of, or in addition to, horns, allowing live or prerecorded instructions and staged evacuation for large or high-rise buildings.

Coordinated flashing of visible appliances in a field of view, required so strobes flash together within a set time window to reduce seizure risk.

The main control panel that receives signals from initiating devices, decides what to do, operates notification and output circuits, and monitors its own wiring for faults.

The addressable data circuit linking the control unit to addressable detectors, modules, and other devices; it carries both power and digital messages and is supervised for faults.

A circuit style in which the outgoing and return paths are separated, so one open conductor does not stop devices beyond the break from operating, though the fault is still reported.

A circuit style in which the conductors run out and back on the same path, so a single open disables all devices beyond the break while the control unit shows a trouble.

A circuit arranged so the control unit detects opens, shorts, and grounds, typically by monitoring a small current through an end-of-line device at the far end.

The normal commercial power supply to the fire alarm control unit, taken from a dedicated branch circuit that is marked and protected against accidental shutoff.

Backup energy, usually rechargeable batteries or a generator, that keeps the system working for code-specified standby and alarm periods when normal power is lost.

A worksheet that totals quiescent current for the standby period plus alarm current for the alarm period, applies derating and aging factors, and yields the required battery capacity.

The initial performance test after installation, witnessed by the authority having jurisdiction, verifying that every device, circuit, and output works as the design intends.

An NFPA 72 form, filled out and signed at acceptance, that documents the installed system, device quantities, and test results and stays available on the premises.

A periodic check, using a calibrated instrument or the manufacturer's listed method, that a smoke detector still responds within its rated sensitivity range.

A condition in which all or part of a fire alarm system is out of service for repair or testing, requiring notification of the fire department and often a fire watch until restored.