CA Fire Alarm cheat sheet

California Fire Code is CCR Title 24, Part 9; it adopts and amends the International Fire Code, and Chapter 9 governs fire protection systems including alarm initiation, notification, and monitoring.

CCR Title 24, Part 2 (California Building Code) Chapter 9 sets construction and occupancy requirements that trigger alarm and detection features; Part 3 (Electrical Code) governs alarm circuit wiring methods.

NFPA 72 is the installation, inspection, testing, and maintenance standard adopted by reference; NFPA 70 (NEC) Article 760 covers fire alarm power-limited and non-power-limited circuit wiring.

California amendments commonly restrict or condition occupancy-based exceptions in the model code; the locally adopted ordinance and AHJ written policy control where the state code is silent.

Design and installation documents must be prepared by or under the supervision of a qualified person and be submitted to the AHJ before installation; approval does not relieve the contractor of code compliance.

New occupancy or change of use, added hazardous operations, and increased occupant load can require alarm upgrades even when the building previously complied.

Where the code references a standard edition, the edition adopted by the AHJ controls; do not assume the newest published edition applies.

Ionization smoke detectors respond to small particles and visible and invisible combustion products; photoelectric detectors respond mainly to larger particles and visible smoke, so photoelectric is generally favored near smoldering fires.

Spot-type heat detectors are fixed-temperature, rate-of-rise, or combination; rate-of-rise responds to rapid temperature increase, while fixed-temperature responds at a set threshold such as 135°F or 194°F.

Smoke detector spacing per NFPA 72 is 30 ft on smooth ceilings, with the first detector within 15 ft of any wall; higher ceilings increase the permitted spacing using the listed correction factors.

Detector spacing must be reduced for ceiling slope and beam pockets; beams deeper than 18 in create pockets that are treated as separate areas unless listed calculations show otherwise.

Duct smoke detectors are required where air-handling systems of 2,000 cfm or greater are installed and are used for smoke control and equipment shutdown, not as a substitute for open-area detection.

Flame detectors respond to radiant energy in ultraviolet or infrared bands and require line-of-sight placement; they are used in high-hazard areas such as flammable liquid storage.

Detectors must be located to avoid obstructions, dead air spaces, and proximity to supply diffusers; NFPA 72 requires at least 3 ft from supply air outlets for smoke detectors.

Public mode audible appliances must produce at least 15 dBA above the ambient sound level or 5 dBA above ambient if the ambient exceeds 105 dBA, measured at 5 ft above the floor.

Private mode requires 10 dBA above ambient; sleeping areas require 75 dBA at the pillow or 15 dBA above ambient, whichever is greater, with the tone measured at the head of the bed.

Audible signals must be distinct from other building signals and must not be masked by background noise; audible-only notification is not permitted where the code requires visible notification.

Visible notification appliances must be synchronized when installed in the same area, and the flash rate must be 1 to 2 Hz with a pulse duration of at least 0.2 second.

Visible appliances are required in public and common areas, in sleeping areas, and in bathrooms and corridors serving sleeping areas, per the accessibility provisions adopted by the AHJ.

Voice evacuation systems must deliver intelligible voice messages; intelligibility is verified by measurement or by a listed design method, and message content must be understandable and prioritized.

Notification appliance circuits are supervised; open, ground, and short faults must annunciate at the control unit within the time required by the standard.

A fire alarm control unit must be listed for the purpose, be located in an accessible area, and be installed so that it is not subject to physical damage or unauthorized operation.

Conventional systems use initiating device circuits with end-of-line resistors and report by zone; addressable systems use signaling line circuits and report individual device identity.

Class A circuits survive a single open or ground fault and continue to operate; Class B circuits annunciate the fault but lose the affected portion of the circuit beyond the fault.

Style designations map to circuit classes: Style B and Style 4 are Class B, and Style D and Style 6 are Class A; the classification is determined by the installation method and supervision.

A supervising station connection must be listed and arranged so that a single fault does not disable both the alarm and the supervising signal path; two independent paths or a listed single path with supervision is required.

Alarm, supervisory, and trouble signals must be distinct by audible and visible means; trouble signals must be resoundable and silenceable only by authorized personnel.

Zoned systems must have zone boundaries that correspond to the building's fire areas, floors, and evacuation zones so that responders can locate the alarm.

Primary power must be a dedicated branch circuit, marked and locked or protected against accidental disconnection, and connected ahead of the main disconnect so it cannot be turned off with the building power.

Secondary power must be a battery or generator that supports the system for the required duration; where the code requires 24 hours of standby, batteries must also support 5 minutes of alarm.

Battery capacity is calculated from the sum of standby loads multiplied by the standby hours plus alarm loads multiplied by the alarm minutes, with a 20 percent aging and temperature derating factor.

Battery calculations use the manufacturer's current draw in amperes; the result is converted to ampere-hours, and the battery selected must be at least the calculated capacity.

Sealed lead-acid batteries require a charging voltage and current within the manufacturer's range; the charger must restore the battery to 85 percent capacity within 24 hours after a discharge.

Battery terminals and connections must be supervised for open, short, and ground faults; a depleted or disconnected battery must produce a trouble signal at the control unit.

Secondary power sources must be tested under load during acceptance testing, and battery replacement intervals are set by the manufacturer's published service life.

Initiating device circuits connect manual pull stations, detectors, and waterflow switches; they are supervised and use end-of-line devices to detect opens and grounds.

Signaling line circuits connect addressable devices and carry both data and power; they must be installed per the manufacturer's listed limits on devices, distance, and circuit loading.

Power-limited fire alarm circuits must be separated from non-power-limited circuits by at least 2 in, or by a listed barrier, and must not be installed in the same raceway or enclosure without a barrier.

Fire alarm cables must be listed for the purpose; plenum-rated cable is required in environmental air spaces, and riser-rated cable is required in vertical shafts.

Conductors must be protected from physical damage, and splices must be made in listed enclosures that remain accessible; no splices are permitted in concealed locations.

Ground faults are the most common wiring fault and must be detected by the control unit; a single ground on a Class B circuit does not prevent alarm operation but must annunciate.

Circuit conductors must be color-coded or tagged, and the installation must be documented with as-built riser diagrams showing device addresses and circuit routing.

Inspection, testing, and maintenance frequencies are set by NFPA 72 tables: monthly for control unit trouble signals and annual for most initiating devices, notification appliances, and batteries.

Smoke detectors require annual functional testing with listed test smoke or a listed test method; heat detectors require annual testing with a listed heat source, not open flame.

Waterflow switches must be tested by opening the inspector's test valve and must operate within the time allowed by the standard; tamper switches must be tested for both positions.

Test records must include the date, device tested, method, result, and the name of the tester, and must be retained and made available to the AHJ on request.

Impairments must be handled under a written impairment program: notify the AHJ and occupants, provide a fire watch where required, and restore and verify the system before returning to normal.

Sensitivity testing of smoke detectors is required at the interval specified by the manufacturer and the standard, and detectors outside the listed range must be cleaned or replaced.

Visual inspection covers obstructions, damage, paint, and loading of devices; notification appliances must be inspected for audibility and visibility in the occupied space.

Submittals must include floor plans with device locations, riser diagrams, a sequence of operations, battery calculations, voltage drop calculations, and manufacturer's data sheets for listed equipment.

Plan review checks device spacing and coverage, circuit class and routing, notification coverage, power supply capacity, and compliance with the adopted code and standards.

Voltage drop calculations must show that the lowest-supply-voltage condition still delivers the appliance's listed minimum operating voltage at the end of the circuit.

Acceptance testing is performed after installation and before the system is placed in service; the AHJ or its representative witnesses the test and the contractor certifies results.

Tests must demonstrate alarm initiation, signal transmission to the supervising station, notification appliance operation, and trouble and supervisory signal annunciation.

As-built documents, operating instructions, and a written maintenance program must be delivered to the owner at completion, and the owner must be trained on system operation.

Final acceptance requires correction of all deficiencies noted during the preliminary test, with a record of retest for each corrected item.