Fundamentals and Definitions (NFPA 72-2022 Ch. 1, 3, and 10)

NFPA 72-2022 Ch. 1 · NFPA 72-2022 Ch. 3 · NFPA 72-2022 Ch. 10 · NFPA 72-2022 §12.6 · NFPA 70-2020 Art. 760 · Outline tasks 1.1.2, 1.2.2, 1.1.1, 1.2.1, 1.3.1

What NICET expects at Level I

Chapters 1, 3, and 10 of NFPA 72-2022 are the foundation of the code: Chapter 3 gives the vocabulary and Chapter 10 gives the general rules that apply to every system. On the exam they appear as quick look-ups (definitions, times, power-supply rules) and as field scenarios: What kind of signal is this? Whom do I notify before I shut off power? How often does a silenced trouble signal come back? A Level I technician works under supervision, but must recognize signals, respect the power-supply rules, and handle an impairment correctly.

Chapter 1: retroactivity and units

• Retroactivity (§1.4.1): unless otherwise noted, the code does not apply to facilities, equipment, or installations that existed or were approved before its effective date. The AHJ may apply portions of the code retroactively where the existing situation presents an unacceptable degree of risk (§1.4).
• Units (§1.6): the code uses U.S. customary (inch-pound) units with SI values in parentheses. Use one system consistently; do not switch back and forth.

Chapter 3: key definitions

Section 3.2 contains the official NFPA definitions (Approved, Authority Having Jurisdiction, Labeled, Listed, Shall, Should). Section 3.3 contains the general definitions in alphabetical order. Many terms are grouped under a "parent" term: for example, Supervisory Condition and Trouble Condition are found under Condition, and the signal types are found under Signal.

Chapter 10: fundamentals

Equipment and compatibility (§10.3)

• All equipment must be listed for the purpose for which it is used (§10.3.1) and installed per the manufacturer's published instructions.
• Devices that receive power from an IDC or SLC must be listed as compatible with that control unit.
• Equipment must operate at 85% and 110% of nameplate voltage, between 32°F and 120°F (0–49°C), and at 85% relative humidity at 86°F (30°C) (§10.3.5).

FACU location and mounting (§10.4)

• §10.4.4: the highest switch, lamp, or textual display must be no more than 6 ft (1.8 m) above the finished floor, and the lowest no less than 15 in. (375 mm), unless the AHJ permits otherwise.
• §10.4.5: in areas that are not continuously occupied, automatic smoke detection is required at each FACU, each NAC power extender, and the supervising station transmitter. Heat detection is permitted where ambient conditions do not allow a smoke detector.

Personnel qualifications (§10.5)

Covers designers (§10.5.1), installers (§10.5.2), and ITM personnel (§10.5.3). Installers must be qualified or supervised by qualified persons (§10.5.2.1). Qualification is shown by a state or local license, a certification acceptable to the AHJ (A.10.5.3.4(2) mentions NICET), or manufacturer certification. The AHJ may ask for the evidence.

Primary power supply (§10.6.5)

• It must come from a dedicated branch circuit (§10.6.5.1).
• The location of the disconnecting means is permanently identified at the FACU. The disconnect has a red marking (without damaging the breaker or covering its markings) and must be accessible only to authorized personnel (§10.6.5.2 and §10.6.5.2.5).
• If the disconnect is a circuit breaker, it gets an approved breaker locking device (§10.6.5.4).
• NEC 2020 760.41(B) (NPLFA) and 760.121(B) (PLFA): red identification, access by qualified personnel only, and the legend FIRE ALARM CIRCUIT.

Secondary power and batteries (§10.6.7, §10.6.9, §10.6.10)

• Where an automatic-starting engine-driven generator serving the dedicated branch circuit is part of the secondary supply, storage batteries dedicated to the system with 4 hours of capacity are also required (§10.6.7).
• Transfer to the secondary supply must be automatic and without loss of required signals.
• The primary and secondary supplies are monitored, and failure of either produces a trouble signal (§10.6.9).
• Batteries are marked with the month and year of manufacture in month/year format (§10.6.10.1). Since January 1, 2024, rechargeable secondary-supply batteries must be listed or component-recognized (§10.6.10.1.3). Table 14.3.1 requires the marking to be checked semiannually.

Quick calculation: Ah = (standby current × 24 h) + (alarm current × 5/60 h). For EVACS use 15/60 h. Then add the margin required by the manufacturer or the specification.

Signals (§10.7 to §10.15 and §12.6)

• Priority (§10.7): fire alarm first, then supervisory, then trouble (mass notification may take precedence where the code permits).
• Distinctive signals (§10.10): the evacuation signal must be distinctive, comply with §18.4.2 (temporal-3), and be used for nothing else; supervisory, trouble, and pre-alarm signals are also distinguishable. The FACU buzzer may use one sound if the display or LEDs make the distinction (§10.10.4).
• Actuation (§10.11.1): notification, control functions, and annunciation within 10 seconds.
• Alarm silencing (§10.12): audible and visible appliances are silenced together (§10.12.2); a new activation on another circuit or device reactivates them.
• Supervisory (§10.14): a subsequent supervisory activation from another zone reactivates silenced supervisory indication.
• Trouble (§10.15): once silenced, it resounds every 24 hours or less until corrected (§10.15.9); every 4 hours for the primary battery of wireless devices. A new trouble also reactivates it.
• Integrity (§12.6.1): an open or ground fault is indicated within 200 seconds.

Impairments (§10.21)

1. Notify the owner or designated representative when the system, or part of it, is impaired, including out-of-service events (§10.21.1).
2. Keep a record of the impairment for 1 year from the date it is corrected (§10.21.2).
3. The supervising station reports to the AHJ any termination of required monitoring (§10.21.3).
4. The service provider reports to the AHJ any system out of service for more than 8 hours (§10.21.4).
5. Apply mitigating measures where the AHJ requires them (§10.21.5).
6. Notify the owner and the AHJ when the impairment ends (§10.21.6).

Unwanted alarms (§10.22) and related features

After an unwanted alarm, investigate the cause and correct it. Alarm verification is not enabled by default unless nuisance alarms are expected, is password protected, and does not delay more than 1 minute (§23.8.5.4.1). PAS requires acknowledgment within 15 s and allows up to 180 s to investigate (§23.8.1.2.1.1).

Numbers to have at hand

What to tab in your books

Chapter vocabulary

Authority Having Jurisdiction (AHJ)

Organization, office, or individual responsible for enforcing the code or approving equipment, materials, installations, or procedures.

Approved

Acceptable to the AHJ.

Listed

Included in a list published by an organization acceptable to the AHJ that evaluates products and periodically inspects production.

Labeled

Bearing the label, symbol, or mark of an evaluation organization acceptable to the AHJ.

Shall / Should

'Shall' indicates a mandatory requirement; 'should' indicates a recommendation that is not required.

Fire alarm control unit (FACU)

Component with primary and secondary power that receives signals from initiating devices or other control units and processes them to operate the required outputs.

Initiating device

Component that originates transmission of a change-of-state condition, such as a smoke detector, manual fire alarm box, or supervisory switch.

Initiating device circuit (IDC)

Circuit of initiating devices whose signal does not identify the individual device that operated.

Signaling line circuit (SLC)

Pathway between addressable devices, interfaces, control units, or transmitters that carries multiple input and/or output signals.

Notification appliance circuit (NAC)

Circuit directly connected to notification appliances such as horns, strobes, or speakers.

Addressable device

Component with its own identification whose status can be individually identified or that individually controls functions.

Zone

Defined area of the protected premises from which a signal is received, to which a signal is sent, or in which a form of control is exercised.

Alarm signal

Signal that results from the manual or automatic detection of an alarm condition.

Supervisory signal

Signal for an abnormal condition in the supervision of other systems, processes, or equipment (for example, a closed valve).

Trouble signal

Signal for an abnormal condition of the system due to a fault (open, ground, loss of power).

Pre-alarm signal

Signal that results from detecting a pre-alarm condition; it must be distinctive from other signals (§10.10.8).

Unwanted alarm

Alarm that does not result from a potentially hazardous condition. Subtypes: malicious, nuisance, unintentional, and unknown.

Nuisance alarm

Unwanted activation caused by a non-hazardous stimulus or condition (steam, dust, cooking smoke).

Positive alarm sequence (PAS)

Automatic sequence that results in an alarm even though it is delayed for investigation, unless the system is reset (15 s + 180 s).

Alarm verification feature

Feature that requires smoke detectors to confirm the condition for a period, or after a reset, to reduce unwanted alarms.

Impairment

Abnormal condition, planned or emergency, in which a system, component, or function is out of order.

Record drawings

Drawings that document device and appliance locations, wiring sequences and methods, and system connections as installed (as-builts).

Qualified

A competent and capable person or company that meets the requirements and training for a given field, acceptable to the AHJ.

Fire warden

Building staff member or tenant trained to perform assigned duties during a fire emergency.

Dedicated branch circuit

Branch circuit that supplies only the fire alarm system; required for the primary power supply (§10.6.5.1).

More Level I study guides

• 8-week study plan
• Fundamentals and Definitions
• Initiating Devices
• Notification Appliances
• Circuits, Systems, and Control Functions
• NEC 2020 (NFPA 70): Article 760 and Wiring Methods
• Basic Electricity and Calculations
• Inspection, Testing and Maintenance
• Troubleshooting, Repair and Device Replacement
• Job Site Safety: OSHA 1910/1926 and First Aid
• Technical Documents, Drawings, and Submittals
• Community-Reported Topics
• Level I tabbing guide for your printed code books
• Strategy with printed code books
• Key numbers (NFPA 72 · NEC · OSHA)
• Formulas and conversions
• Fire alarm glossary for the NICET exams