OR Fire Alarm Installer key terms

A field device that has its own unique digital identifier on the signaling line circuit, so the control unit can report and test it individually rather than reporting only a zone.

A group of initiating devices wired on a single pair of conductors so the panel sees the group as one alarm location, not individual devices.

A defined area or group of devices used to locate a fire or trouble condition and to organize annunciation, output logic, and response planning.

The wiring path connecting automatic detectors and manual stations to the control unit, monitored for alarm, open, and short conditions.

The addressable data loop or spur that carries power and digital communication between the control unit and addressable devices such as detectors, modules, and isolators.

The power circuit that operates horns, strobes, speakers, and other alerting devices, typically supervised and arranged so a single fault does not disable all notification.

A resistor installed at the far end of a supervised conventional circuit so the panel can detect opens, and detect shorts by the drop in normal current.

Continuous electrical monitoring of circuit integrity and component power so that a break, short, or loss of operating power produces a trouble signal at the control unit.

A supervised circuit that continues to function past a single open or ground fault because the outgoing and return paths are separate, allowing devices beyond the fault to still operate.

A supervised circuit that loses operation beyond a single open fault; the panel still detects the fault but devices past the break no longer function.

The maximum listed spacing between detectors, commonly 30 feet on smooth ceilings, adjusted downward for ceiling height, beams, and airflow conditions.

A detector that samples air at a localized point, using photoelectric light scatter or ionization sensing, as opposed to projecting a beam across a space.

A smoke detector that spans a long distance with a transmitter and receiver, responding to smoke obscuration along the beam path; typically used in large open spaces.

A system that draws air from a protected area through a pipe network to a remote detector, used where point detectors are impractical or early warning is needed.

A device that responds to fixed temperature, rate of temperature rise, or both; it is slower than smoke detection and used where smoke detectors are unsuitable.

The floor area assigned to one detector, derived from listed spacing and ceiling geometry, used to lay out detector locations on a plan.

A manually operated initiating device, usually pull-station type, mounted along the means of egress at accessible height so occupants can trigger the alarm.

A device on a sprinkler system pipe that senses sustained water movement and sends an alarm signal, distinguishing real flow from pressure surges.

A signal indicating an off-normal condition in a suppression or control system, such as a closed valve or low air pressure, that does not yet indicate fire.

A signal produced by an initiating device or system indicating a fire or other emergency condition requiring response.

A distinctive indication of a fault in system wiring, power, or components that could impair operation, annunciated audibly and visibly at the control unit.

A remote or local display unit that identifies alarm, supervisory, and trouble conditions by zone or device label so responders can locate the event.

Coordination of flash timing among strobes on the same circuit or system so simultaneous flashes do not create an unsafe composite flash rate.

The measure of strobe light intensity; required rating increases with room size and mounting height to maintain effective warning visibility.

A notification device combining a sounder and a strobe in one unit, mounted so both the sound level and the light output meet the applicable requirements.

An emergency communication arrangement using speakers and intelligible voice messages instead of, or in addition to, tone signals to direct occupants.

The normal commercial or on-site source feeding the control unit, required to be dedicated and connected ahead of other loads so it is not casually switched off.

The standby source, usually rechargeable batteries, that keeps the system operating for a specified time when primary power fails.

The computation of standby and alarm current draws multiplied by required time durations, plus a recharge margin, to select an adequate battery capacity.

The loss of voltage along conductors caused by current flowing through wire resistance, which must be checked so devices at the end of a circuit still receive their listed minimum voltage.

A component that limits transient overvoltages on power or signal lines to protect control equipment, often required where the system interfaces with outside wiring.

An unintended connection between a circuit conductor and ground, detected by the panel and annunciated as a trouble condition.

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

The recurring program of visual checks and functional tests at required intervals to confirm the system remains operational and code compliant.

The form documenting the installed system, its components, and test results, provided to the owner and kept available for the authority having jurisdiction.

The organization or official responsible for approving plans, issuing permits, and enforcing the applicable fire and electrical codes for a project.

The written authorization required before installing or altering a fire alarm system, issued after plan review and subject to inspection before final approval.

The AHJ's examination of submitted drawings and calculations to confirm the design meets adopted codes before installation begins.

The National Electrical Code article governing fire alarm system wiring methods, conductor types, and installation requirements for power-limited and non-power-limited circuits.

The fire code adopted in Oregon that incorporates national model fire code provisions with state amendments and governs fire alarm installation and maintenance requirements.