NM Fire Alarm key terms

The wiring path and connected devices, such as smoke detectors and pull stations, that report an alarm, supervisory, or trouble condition to the control unit. Class A and Class B styles differ in survivability after a single open.

The circuit supplying power and signal to audible and visible devices such as horns, speakers, and strobes. Its voltage drop and current draw must be calculated to ensure appliances operate at their listed minimum ratings.

A signaling circuit whose conductors leave the control unit and return on a separate path, so a single open or ground fault does not prevent operation of all devices. NFPA 72 designates these as Style D, E, or F depending on the circuit type.

A signaling circuit that does not return to the control unit. A single open fault disables all devices beyond the break, though devices ahead of the fault continue to operate. NFPA 72 calls these Style B, C, or Y circuits.

A method of confirming that conductors are large enough to deliver adequate voltage to the furthest appliance. It uses conductor resistance, circuit current, and length, and is required documentation for notification circuits.

The computation showing that batteries or another secondary supply can operate the system for the code-required duration, typically 24 hours of standby followed by 5 minutes of full alarm. It accounts for quiescent and alarm current of every device.

An on-site energy source, usually rechargeable batteries, that keeps the fire alarm system operational when normal building power fails. NFPA 72 specifies capacity, recharge time, and monitoring requirements for it.

The ampere-hour rating of a storage battery, derated for aging and temperature, used to verify the secondary supply meets standby and alarm load demands. Calculations often apply a 20 percent aging factor and a low-temperature derating.

The ability of critical fire alarm circuits to continue functioning during a fire condition that damages wiring. It is achieved through Class A wiring, circuit separation, or listed circuit protective systems depending on the occupancy and system type.

Cable listed to maintain circuit operation for a specified period under fire exposure, such as two hours. It is used where NFPA 72 requires survivable pathways for notification or control circuits.

The National Electrical Code article governing fire alarm systems, covering power-limited and non-power-limited fire alarm circuits, conductor types, installation methods, and separation from other wiring. It is the primary wiring reference for fire alarm installers.

A fire alarm circuit whose power is limited by a listed source to reduce fire and shock hazard, allowing less restrictive wiring methods. Article 760 defines its voltage and current limits and required conductor markings.

A fire alarm circuit not limited by a power source, typically operating at higher voltage or current. It requires wiring methods similar to general power circuits, including raceway or specific cable types, under Article 760.

Fire alarm cable listed for use in risers, meaning vertical shafts between floors, but not for plenum spaces. Its jacket and marking indicate the permitted installation location under Article 760.

Fire alarm cable listed for installation in plenums and other air-handling spaces, where low smoke and flame spread are critical. It may be substituted in locations requiring FPLR or FPL cable.

Cable with a jacket tested for low smoke production and limited flame spread, suitable for air-handling spaces. In fire alarm work, FPLP is the plenum-rated designation.

The display of system status, such as alarm location, zone, or device identity, at the control unit or a remote panel. Clear annunciation helps responders locate the fire and identify affected areas quickly.

The central panel that monitors initiating devices, processes signals, activates notification appliances, and reports alarms and troubles. Its listing, capacity, and programming must match the installed system design.

A fire alarm architecture in which each device has a unique address, letting the panel identify the specific device in alarm or trouble. This speeds response and simplifies troubleshooting compared with conventional zone systems.

A fire alarm arrangement where devices are grouped into zones, and the panel reports only the zone rather than the individual device. It is common in smaller buildings and requires field verification to locate the alarm source.

A facility that receives and monitors fire alarm signals from protected premises, such as a central station, proprietary station, or remote supervising station. NFPA 72 defines the staffing, equipment, and response requirements for each type.

A supervising station that is listed and operates under a protective signaling service, receiving signals from many protected premises and dispatching appropriate response. It must meet NFPA 72 requirements for staffing and equipment.

The means by which alarm, supervisory, and trouble signals travel from the protected premises to a supervising station. Methods include dedicated phone lines, IP networks, cellular, and radio, each with monitoring and redundancy requirements.

An indication that a system component is not functioning properly, such as an open circuit, ground fault, or loss of communication. NFPA 72 requires audible and visual trouble indication within specified times.

A signal indicating that a monitored condition is abnormal but not yet an alarm, such as a closed sprinkler valve or low water level. Supervisory signals require distinct annunciation and often transmission to a supervising station.

A signal produced when a fire condition is detected, causing notification appliances to operate and the event to be reported. Its processing and transmission times are governed by NFPA 72 requirements.

A detector that samples air at a single location using ionization or photoelectric sensing. Placement must follow NFPA 72 spacing rules and manufacturer instructions, accounting for ceiling height and airflow.

A smoke detector that responds to light scattered or blocked by smoke particles, generally more responsive to smoldering fires. It is often selected for areas where visible smoke is expected before open flame.

A smoke detector that senses changes in an electrical current caused by smoke particles entering a chamber, generally more responsive to flaming fires. It may be prone to nuisance alarms from cooking or dust.

The maximum distance between smoke detectors based on listed spacing, typically 30 feet on smooth ceilings, adjusted for ceiling height, slope, and obstructions. NFPA 72 also requires detectors within specified distances of walls and obstructions.

A device that alerts occupants, such as a horn, speaker, chime, or strobe. Its mounting height, candela rating, and audibility must comply with NFPA 72 and accessibility standards.

The coordinated flashing of visible notification appliances so that strobes flash together, preventing seizures and meeting code requirements. It is achieved through the control unit or listed synchronization modules.

Notification outputs that warn occupants through sound and light. NFPA 72 sets sound pressure levels, candela ratings, and mounting heights, and requires visible signals in certain public and accessible areas.

The recurring program of visual inspection, functional testing, and maintenance that verifies a fire alarm system remains operational. NFPA 72 establishes frequencies, methods, and documentation requirements for each component.

A documented test performed after installation to confirm the system meets its design and code requirements before it is placed in service. Results are recorded and retained for the authority having jurisdiction.

A form documenting that the fire alarm system was installed and tested in accordance with code and design documents. It includes system details, device lists, and signatures of the installer and tester.

The organization, office, or individual responsible for approving equipment, installations, and procedures under the applicable code. In New Mexico, this is typically the local fire authority or state fire marshal's office.

The state official responsible for fire prevention, code enforcement, and licensing oversight under New Mexico law. The office administers rules affecting fire alarm contractors and adoption of fire codes statewide.

The state requirement that a business performing fire alarm work hold a valid license and employ qualified personnel. New Mexico regulates fire protection contractors through its licensing statutes and rules.

A person who has demonstrated the training or experience required to install, test, or maintain fire alarm systems. Licensing rules define supervision levels and the scope of work each qualification permits.