TX Fire Alarm Installer cheat sheet

NFPA 72 is the National Fire Alarm and Signaling Code; NEC Article 760 governs fire alarm wiring; the adopted local code edition is enforced by the authority having jurisdiction.

Texas fire alarm installer licensing is administered through the Texas Department of Insurance State Fire Marshal's Office; separate local permits may also be required.

License categories, qualifications, and renewal requirements are set by Texas statute and TDI rule; regulated fire alarm work requires the applicable credential.

IBC and IFC fire alarm requirements depend on occupancy classification, occupant load, building height, and local amendments adopted by the AHJ.

Plans and specifications must be approved before installation when required by the AHJ.

NICET certification may satisfy a qualification requirement but does not replace a Texas license.

The code edition in effect is the edition adopted by the AHJ on the permit date, not necessarily the newest published edition.

Listed device ratings and manufacturer installation instructions are part of the installation requirements.

An alarm signal indicates a fire emergency; a supervisory signal indicates an off-normal condition; a trouble signal indicates a system impairment.

Conventional systems group devices by zone; addressable systems identify individual devices by unique address.

An initiating device circuit connects detection devices to the panel; a notification appliance circuit supplies audible and visible appliances.

For smooth ceilings, spot-type smoke detector spacing is typically 30 ft maximum with 900 sq ft maximum area per detector.

Heat detector spacing depends on rating and ceiling height; ordinary 135°F units are typically limited to 50 ft spacing on smooth ceilings.

Detector spacing must be reduced near beams, walls, and ceiling height changes in accordance with code coverage rules.

Protected premises systems monitor alarm, supervisory, and trouble conditions and annunciate them at a control unit.

Voice evacuation systems require intelligible voice messages in addition to alarm tones.

Manual fire alarm boxes are located within 5 ft of exit doorways and mounted 42 to 48 in above finished floor.

Smoke detectors are not installed within 3 ft of supply air diffusers; wall and ceiling clearance rules also apply.

Duct smoke detectors are required for air-handling units over 2,000 cfm per the mechanical code and do not substitute for area detection.

Heat detector temperature ratings include 135°F ordinary, 194°F intermediate, and 286°F high-temperature.

Smoke detector sensitivity is tested within 1 year of installation and every 2 years thereafter.

Detectors in elevator lobbies and machine rooms follow NFPA 72 and elevator code requirements.

Projected beam smoke detectors are spaced and installed according to their listing and manufacturer instructions.

Manual stations must be visible, unobstructed, and accessible from the path of egress.

The temporal-three evacuation tone consists of three 0.5-second pulses separated by 0.5-second pauses, followed by a 1.5-second pause.

Public-mode audibility requires 15 dBA above ambient or 5 dBA above maximum ambient, with a minimum of 65 dBA.

Sleeping-area audibility requires 75 dBA at the pillow or 15 dBA above ambient, whichever is greater; 520 Hz low-frequency tone may be required.

Visible notification appliances in the same field of view must flash in synchronization.

Candela ratings are selected from coverage tables based on room size, mounting height, and appliance listing.

Voice intelligibility is commonly evaluated with STI, with 0.45 often used as the minimum acceptable value.

NAC wiring is supervised for opens, shorts, and ground faults, with an end-of-line resistor at the last device on Class B circuits.

Alarm silencing must not prevent subsequent alarm signals from sounding or displaying.

Class A circuits continue operating after a single open or ground fault because they have a redundant return path.

Class B circuits use an end-of-line resistor and annunciate a trouble but do not continue operating after an open circuit.

An addressable signaling line circuit carries device data and power; each device has a unique address.

NEC Article 760 requires fire alarm cables listed for the purpose: FPL, FPLR riser-rated, or FPLP plenum-rated.

Fire alarm conductors must be separated from power conductors unless the code permits otherwise.

The fire alarm control panel requires a dedicated 120 VAC branch circuit marked “FIRE ALARM.”

Ground-fault detection is required on fire alarm circuits to monitor unintended connections to ground.

Panel trouble signals must annunciate audibly and visibly at the control unit.

Primary power is a dedicated 120 VAC branch circuit marked for fire alarm service and protected against accidental disconnection.

Secondary power is typically batteries or a generator sized for 24 hours standby followed by 5 minutes alarm.

Battery capacity formula: Ah = [(standby current × 24 h) + (alarm current × alarm hours)] × aging factor such as 1.2.

Sealed lead-acid batteries require periodic load testing and replacement when capacity falls below the listed threshold, commonly 80%.

Battery charging voltage and current must follow the panel or battery manufacturer’s listing.

UPS or generator backup must be sized for both standby and alarm loads.

NAC voltage-drop calculations must keep appliance voltage within its listed operating range.

Secondary power must connect automatically when primary power fails.

Annual testing covers initiating devices, notification appliances, control unit functions, and remote annunciators.

Smoke detector sensitivity is tested within 1 year of installation and every 2 years thereafter.

Waterflow and supervisory devices are commonly tested quarterly under NFPA 72 inspection tables.

Battery load testing is performed annually, with battery condition checked during routine inspections.

An impairment requires notification to the AHJ, implementation of a fire watch or approved alternative, and documentation.

Test records must be retained and made available to the AHJ.

Each initiating device is tested to verify alarm annunciation at the control panel.

After modifications, affected circuits and devices are retested before the system is returned to service.

The Record of Completion documents installation features, device inventory, and signatures verifying compliance with approved plans.

As-built drawings show actual device locations, circuit routing, panel schedules, and field changes.

The Sequence of Operations describes cause-and-effect responses for alarm, supervisory, and trouble conditions.

Battery calculations and NAC voltage-drop calculations are part of the design submittal.

Inspection, testing, and maintenance records must be retained and available to the AHJ.

The owner’s manual includes operating instructions and maintenance requirements.

Plan review comments and permits must be resolved before final acceptance testing.

A device address list and zone map aid testing, troubleshooting, and system documentation.