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NICET FAS-II study materials
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NICET FAS-II practice questions

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Question 1Fire Alarm System Fundamentals and Components

On a smooth ceiling, what is the maximum permitted spacing between spot-type smoke detectors based on the standard listed spacing?

  1. 15 ft (4.6 m)
  2. 30 ft (9.1 m) Correct answer.
  3. 50 ft (15.2 m)
  4. 20 ft (6.1 m)

Explanation

Spot-type smoke detectors on smooth ceilings are limited to a listed spacing of 30 ft between detectors, which corresponds to roughly 900 sq ft of coverage per detector. That 30 ft dimension is measured detector to detector, not detector to wall.

Question 2Fire Alarm System Fundamentals and Components

Where must the operable portion of a manual fire alarm box be located above the finished floor?

  1. 30 in to 36 in (760 mm to 910 mm)
  2. 50 in to 55 in (1270 mm to 1400 mm)
  3. 60 in to 66 in (1520 mm to 1680 mm)
  4. 42 in to 48 in (1070 mm to 1220 mm) Correct answer.

Explanation

Manual fire alarm boxes must have their operable part between 42 in and 48 in above the finished floor so the general public, including people using wheelchairs, can reach them without obstruction.

Question 3Fire Alarm System Fundamentals and Components

Which device initiates an alarm signal when water begins to move through a sprinkler system's piping?

  1. A pressure-reducing valve
  2. A waterflow switch Correct answer.
  3. A valve tamper switch
  4. A low-air-pressure switch

Explanation

A waterflow switch senses movement of water in the sprinkler piping and initiates an alarm signal. Valve tamper switches and low-air-pressure switches report supervisory conditions rather than alarms.

Question 4Fire Alarm System Fundamentals and Components

Smoke detectors installed in HVAC ducts are primarily intended to do which of the following?

  1. Detect smoke within the occupied space below the duct
  2. Measure the air velocity moving through the ductwork
  3. Substitute for ceiling-mounted area detectors in the space
  4. Control smoke spread by shutting down air-handling units Correct answer.

Explanation

Duct detectors sample the air moving through the duct so that smoke being recirculated or distributed by the air-handling system is detected, allowing fans to be stopped and smoke spread limited. They supplement, and never replace, the area detection required for the protected space.

Question 5Fire Alarm System Fundamentals and Components

What is the function of the end-of-line resistor on a conventional initiating device circuit?

  1. It supervises the circuit conductors for open conditions Correct answer.
  2. It limits the current drawn by detectors during alarm
  3. It supplies operating power to the last device on the circuit
  4. It provides a unique address to each device in the zone

Explanation

The end-of-line device allows a small supervisory current to flow through the circuit; if a conductor opens, that current path is lost and the control unit annunciates a trouble. It does not power devices, limit alarm current, or provide addressing.

Question 6Fire Alarm System Fundamentals and Components

The AC primary power source for a fire alarm control unit must be connected to which of the following?

  1. A branch circuit shared with the building's emergency lighting
  2. A branch circuit protected by a ground-fault circuit interrupter
  3. A convenience receptacle located within 6 ft of the panel
  4. A dedicated branch circuit that is not protected by a GFCI Correct answer.

Explanation

The primary supply must be a dedicated, mechanically protected branch circuit that is not GFCI protected and is marked at the disconnect means as the fire alarm circuit. Sharing the circuit or using a receptacle would allow power to be removed without warning.

Question 7Fire Alarm System Fundamentals and Components

In public mode, an audible notification appliance must produce a sound level at least how far above the average ambient sound level?

  1. 5 dBA
  2. 25 dBA
  3. 15 dBA Correct answer.
  4. 10 dBA

Explanation

Public-mode audible signals must exceed the average ambient sound level by at least 15 dBA, or by 5 dBA over the maximum ambient lasting 60 seconds or more, whichever is greater. The signal must also meet a minimum level measured 10 ft from the appliance.

Question 8Fire Alarm System Fundamentals and Components

A commercial fire alarm system's secondary (standby) power supply must be capable of operating the system for which of the following?

  1. 24 hours of standby followed by 5 minutes of alarm Correct answer.
  2. 4 hours of standby followed by 5 minutes of alarm
  3. 12 hours of standby followed by 5 minutes of alarm
  4. 24 hours of standby followed by 15 minutes of alarm

Explanation

For commercial protected-premises systems, the secondary supply must support 24 hours of standby operation followed by 5 minutes of alarm operation. The 5-minute alarm period is calculated using the full alarm load of the system.

Question 9Fire Alarm System Fundamentals and Components

A technician opens one conductor of an initiating device circuit and finds that all devices beyond the break stop communicating with the panel. This circuit is wired as which of the following?

  1. Class B Correct answer.
  2. Class A
  3. Class X
  4. Class N

Explanation

A Class B circuit is a two-wire circuit that does not return to the control unit, so a single open disables every device downstream of the fault. Class A and Class X circuits provide a return path that keeps all devices operable after a single open.

Question 10Fire Alarm System Fundamentals and Components

A single ground fault occurs on a supervised fire alarm circuit. The control unit should do which of the following?

  1. Energize all notification appliances
  2. Initiate an alarm signal on that zone
  3. Indicate a trouble condition at the control unit Correct answer.
  4. Disconnect the affected circuit until manually reset

Explanation

A ground fault is a fault condition and must be annunciated as a trouble signal, not as an alarm. The circuit stays in service so the system can still detect and signal a fire while the fault is located and corrected.

Question 11Fire Alarm System Fundamentals and Components

Notification appliance circuits must be designed so that the voltage drop at the end of the circuit does not exceed what percentage of the appliances' rated voltage?

  1. 5 percent
  2. 20 percent
  3. 25 percent
  4. 10 percent Correct answer.

Explanation

Voltage drop on notification appliance circuits is limited to 10 percent of the appliance rated voltage. Exceeding this limit can leave appliances at the end of a long run operating below their listed voltage and producing reduced output.

Question 12Fire Alarm System Fundamentals and Components

Where an alarm verification feature is used, what is the maximum time the system may delay a detector's alarm signal for confirmation?

  1. 30 seconds
  2. 90 seconds
  3. 60 seconds Correct answer.
  4. 10 seconds

Explanation

Alarm verification briefly delays the alarm signal while the panel looks for a confirming signal, and the total delay is limited to 60 seconds. This reduces nuisance alarms from transient conditions without significantly postponing response to a real fire.

Question 13Fire Alarm System Fundamentals and Components

Activation of the smoke detector in the elevator lobby on the designated level normally causes the elevators to do which of the following?

  1. Recall to the designated alternate level Correct answer.
  2. Remain in service until the machine room detector operates
  3. Recall to the designated level and open their doors
  4. Stop at the nearest landing with doors open

Explanation

Phase I elevator recall moves cars to the alternate level when the lobby detector on the designated level operates, so firefighters arrive at a landing away from the fire floor. A lobby detector on an alternate level instead recalls cars to the designated level.

Question 14Fire Alarm System Fundamentals and Components

Where a spot-type smoke detector is mounted on a wall, the top of the detector must be located how far below the ceiling?

  1. 1 in to 4 in (25 mm to 100 mm)
  2. 4 in to 12 in (100 mm to 300 mm) Correct answer.
  3. 18 in to 24 in (460 mm to 610 mm)
  4. 12 in to 18 in (300 mm to 460 mm)

Explanation

A wall-mounted spot detector must have its top edge at least 4 in and no more than 12 in below the ceiling. This keeps the detector within the ceiling jet while avoiding the dead air space that forms at the wall-to-ceiling intersection.

Question 15Fire Alarm System Fundamentals and Components

How far must a spot-type smoke detector be located from a supply air diffuser?

  1. 12 in (300 mm)
  2. 72 in (1830 mm)
  3. 24 in (600 mm)
  4. 36 in (900 mm) Correct answer.

Explanation

At least 36 in must be maintained between a spot-type smoke detector and a supply air diffuser. Supply air can dilute smoke or blow it away from the detector, delaying response.

Question 16Fire Alarm System Fundamentals and Components

Which detector type generally responds fastest to a flaming fire that produces small combustion particles?

  1. Air-aspirating
  2. Projected beam
  3. Photoelectric
  4. Ionization Correct answer.

Explanation

Ionization detectors are most responsive to the small particles characteristic of flaming combustion. Photoelectric detectors respond best to the larger particles and visible smoke produced by smoldering fires, and both types are acceptable for general area protection.

Question 17Fire Alarm System Fundamentals and Components

What is the main advantage of an addressable system over a conventional zone system?

  1. It eliminates the need for circuit supervision
  2. It identifies each device individually Correct answer.
  3. It can operate without standby power
  4. It does not require a control unit

Explanation

Addressable devices report their own identity, so an alarm or trouble is annunciated at a specific device location instead of a general zone. Addressable circuits are still supervised, and the system still requires a listed control unit and a secondary power supply.

Question 18Fire Alarm System Fundamentals and Components

What is the lowest listed candela rating for a visible notification appliance intended for a room?

  1. 30 cd
  2. 5 cd
  3. 75 cd
  4. 15 cd Correct answer.

Explanation

The listed candela ratings for visible appliances begin at 15 cd, with higher ratings such as 30, 75, and 110 cd used where larger spaces or greater mounting heights require more light output.

Question 19Fire Alarm System Fundamentals and Components

Which condition is annunciated as a supervisory signal?

  1. A low-battery condition on the standby supply
  2. Activation of a manual fire alarm box
  3. A sprinkler control valve that has been closed Correct answer.
  4. An open in a notification appliance circuit

Explanation

A closed sprinkler control valve is a supervisory condition because it impairs the system's ability to control a fire without being an actual alarm. Manual station activation is an alarm, while circuit opens and battery problems are trouble conditions.

Question 20Fire Alarm System Fundamentals and Components

A rate-of-rise heat detector responds to which of the following?

  1. An absolute temperature set point being reached
  2. A drop in the ambient temperature
  3. The accumulation of visible smoke particles
  4. Temperature increasing faster than a predetermined rate Correct answer.

Explanation

Rate-of-rise detectors use a sensing element that responds when temperature climbs faster than a set rate, regardless of the starting temperature. Fixed-temperature devices instead operate when a specific set point is reached.

Question 21Fire Alarm System Fundamentals and Components

A system draws 0.40 A in standby and 2.5 A in alarm. What battery capacity is required to support 24 hours of standby plus 5 minutes of alarm before any derating factor is applied?

  1. 60.2 Ah
  2. 11.8 Ah
  3. 9.6 Ah
  4. 9.8 Ah Correct answer.

Explanation

Standby capacity is 0.40 A times 24 hours, or 9.6 Ah. Alarm capacity is 2.5 A times 5/60 hour, or about 0.21 Ah, giving a total of roughly 9.8 Ah before any aging or temperature derating is applied.

Question 22Fire Alarm System Fundamentals and Components

A notification appliance drawing 0.5 A is connected through conductors having a total loop resistance of 2 ohms. What is the voltage drop on the circuit?

  1. 1.0 V Correct answer.
  2. 4.0 V
  3. 2.0 V
  4. 0.5 V

Explanation

Voltage drop equals current times resistance: 0.5 A times 2 ohms equals 1.0 V. That drop is subtracted from the source voltage to verify the appliance still receives its listed operating voltage at the end of the circuit.

Question 23Fire Alarm System Fundamentals and Components

An air-aspirating smoke detection system is best suited for which of the following?

  1. An outdoor area exposed to rain and wind
  2. An area with difficult access, such as a cable tunnel Correct answer.
  3. A small office with a standard suspended ceiling
  4. A space where visible smoke is never expected

Explanation

Air-aspirating systems draw air through a network of pipes and sampling ports back to a highly sensitive detection chamber, which suits spaces that are hard to reach or hostile to spot detectors. They still require routine maintenance such as filter replacement and port cleaning.

Question 24Fire Alarm System Fundamentals and Components

A projected-beam smoke detector is most appropriate for which application?

  1. A corridor with an 8 ft ceiling and many doorways
  2. A small electrical closet packed with equipment
  3. A large open area with a high ceiling Correct answer.
  4. A room subdivided by full-height partitions

Explanation

A projected-beam detector covers long distances with a single beam path between a transmitter and receiver, making it economical for large, open, high-ceilinged spaces. Anything that blocks the beam path, such as full-height partitions, makes beam detection unsuitable.

Question 25Fire Alarm System Fundamentals and Components

A Class A notification appliance circuit is run with separate supply and return conductors. If one conductor opens between two appliances, the circuit will do which of the following?

  1. Continue to operate all appliances through the return path Correct answer.
  2. Automatically reconfigure itself as a Class B circuit
  3. Cause the control unit to shut down the circuit until repaired
  4. Disable every appliance on the circuit

Explanation

Because a Class A circuit returns to the control unit, a single open still leaves an uninterrupted path to every appliance, and the panel reports a trouble at the same time. A Class B circuit, having no return path, would lose all appliances beyond the break.

Question 26Fire Alarm System Fundamentals and Components

On a smooth, flat ceiling, spot-type smoke detectors are generally permitted to be spaced no more than what maximum distance apart?

  1. 20 ft
  2. 25 ft
  3. 50 ft
  4. 30 ft Correct answer.

Explanation

Listed spot-type smoke detectors on a smooth ceiling are spaced at 30 ft, which corresponds to about 900 sq ft of protected area per detector. The spacing is measured along the ceiling, and the last detector is kept within half the listed spacing of the wall.

Question 27Fire Alarm System Fundamentals and Components

A fixed-temperature heat detector intended for an ordinary occupied space normally carries which marked set point?

  1. 100°F
  2. 225°F
  3. 175°F
  4. 135°F Correct answer.

Explanation

Fixed-temperature heat detectors are marked with a set point that must sit comfortably above the highest expected normal ceiling temperature. Common ratings run from about 135°F to 194°F, with 135°F used in ordinary spaces. Higher ratings are reserved for hot environments such as kitchens or boiler rooms.

Question 28Fire Alarm System Fundamentals and Components

A control unit is simultaneously showing an alarm, a supervisory condition, and a trouble condition. Which signal is displayed with the highest priority?

  1. Trouble signal
  2. The most recently received signal
  3. Alarm signal Correct answer.
  4. Supervisory signal

Explanation

Signals are ranked in a fixed hierarchy: alarm first, then supervisory, then trouble. The higher-ranked condition controls the display and the common audible signal until it is acknowledged and cleared. Priority is determined by condition type, not by the order in which events arrive.

Question 29Fire Alarm System Fundamentals and Components

The operable portion of a manual fire alarm box must be mounted at what height above the finished floor?

  1. 36 in to 42 in
  2. 48 in to 60 in
  3. 30 in to 36 in
  4. 42 in to 48 in Correct answer.

Explanation

Manual fire alarm boxes are mounted with the operable portion between 42 in and 48 in above the finished floor. This range places the pull station within the reach range of a person in a wheelchair as well as a standing adult.

Question 30Fire Alarm System Fundamentals and Components

On a Class B initiating device circuit, where is the end-of-line resistor installed?

  1. Inside the control unit across the zone terminals
  2. At a midpoint device so both halves are supervised
  3. Across the terminals of the first device on the circuit
  4. At the far end of the circuit, past the last device Correct answer.

Explanation

A Class B circuit is supervised by a resistor placed at the far end of the two-wire path, beyond every device on the circuit. The panel then sees a known normal current through the resistor; an open or short anywhere along the path changes that current and produces a trouble.

Question 31Fire Alarm System Fundamentals and Components

Where a visible notification appliance is mounted on a wall, the entire lens must be located within which height range above the finished floor?

  1. 60 in to 72 in
  2. 72 in to 90 in
  3. 80 in to 96 in Correct answer.
  4. 96 in to 108 in

Explanation

Wall-mounted visible appliances are installed so the entire lens sits not less than 80 in and not more than 96 in above the finished floor. This band keeps the strobe within the field of view of standing and seated occupants.

Question 32Fire Alarm System Fundamentals and Components

A waterflow switch on a sprinkler system must cause an alarm signal to be indicated within how many seconds of sustained water flow?

  1. 30 seconds
  2. 60 seconds
  3. 120 seconds
  4. 90 seconds Correct answer.

Explanation

Sprinkler waterflow switches are arranged to signal an alarm within 90 seconds of water flow at the alarm-initiating threshold. The delay is intended to ride through pressure surges and short duration flow changes without producing false alarms.

Question 33Fire Alarm System Fundamentals and Components

Which best describes when a valve tamper switch on a sprinkler control valve must operate?

  1. At ten handwheel turns from the open position
  2. Only when the valve reaches the fully closed position
  3. At two handwheel turns or one-fifth of total travel Correct answer.
  4. Only after waterflow is detected in the riser

Explanation

A valve supervisory switch must operate when the valve has been closed by two revolutions of the handwheel or when the valve stem has moved one-fifth of its total travel, whichever occurs first. The intent is to catch a partially closed valve before it seriously restricts flow.

Question 34Fire Alarm System Fundamentals and Components

Visible notification appliances within the same viewing area must be arranged to do which of the following?

  1. Flash simultaneously in synchronization Correct answer.
  2. Flash no more than 30 times per minute
  3. Flash in sequence from the nearest exit outward
  4. Alternate between strobe and non-strobe units

Explanation

Where multiple strobes can be seen by occupants in the same area, they must flash in synchronization so the combined effect does not create an increased photosensitive seizure risk. Synchronization modules or synchronized appliance models are used to achieve this.

Question 35Fire Alarm System Fundamentals and Components

An addressable monitor module is used for which purpose?

  1. To provide standby power to addressable detectors
  2. To operate a notification appliance from the signaling line circuit
  3. To supervise a dry contact and report its status to the loop Correct answer.
  4. To isolate a short circuit on the signaling line circuit

Explanation

A monitor module gives an address to a conventional device or a dry contact, such as a waterflow switch or tamper switch, so the control unit can identify that point individually. It reports status on the signaling line circuit but does not switch power to output devices.

Question 36Fire Alarm System Fundamentals and Components

When a duct smoke detector operates, the system is typically arranged to do which of the following?

  1. Sound a local trouble only at the duct detector
  2. Release the suppression system serving the duct
  3. Shut down the air-handling unit and signal an alarm Correct answer.
  4. Close the fire doors on the affected floor

Explanation

A duct detector senses smoke moving through the air-handling system and is arranged to stop the fan so smoke is not distributed through the building. Its operation is also reported to the fire alarm control unit as an alarm or supervisory condition, depending on the design.

Question 37Fire Alarm System Fundamentals and Components

An operator presses the alarm silence switch at the control unit while an alarm is active. What happens?

  1. The system automatically resets and returns to normal
  2. The alarm condition is reclassified as a supervisory signal
  3. Appliances are silenced but the alarm state remains Correct answer.
  4. The initiating devices on the affected zone are disabled

Explanation

Alarm silence only quiets the notification appliances on the circuit. The control unit keeps the alarm condition, its indication, and its record until a manual reset is performed, and a new alarm on the system will re-sound the appliances.

Question 38Fire Alarm System Fundamentals and Components

After initial installation, a spot-type smoke detector must have its sensitivity verified within one year and then at what interval?

  1. Every six months thereafter
  2. Every five years thereafter
  3. Every alternate year thereafter Correct answer.
  4. Annually thereafter

Explanation

Sensitivity of installed smoke detectors is checked within one year of installation and at least every alternate year afterward. The one-year first check catches units that drifted during shipping, storage, or initial service.

Question 39Fire Alarm System Fundamentals and Components

A peaked ceiling slopes upward at an angle greater than 30 degrees. Where is the first row of spot-type smoke detectors placed?

  1. Along the low edge of the sloped ceiling
  2. Within 12 in of the peak, measured horizontally
  3. At the midpoint of the slope, spaced 30 ft apart
  4. Within 3 ft of the peak, measured horizontally Correct answer.

Explanation

On a steeply sloped ceiling, hot smoke tends to collect at the high point, so a row of detectors is placed within 3 ft of the peak measured horizontally. Additional detectors beyond that row follow normal spacing measured along the slope.

Question 40Fire Alarm System Fundamentals and Components

What is the function of a short-circuit isolator on an addressable signaling line circuit?

  1. It isolates the faulted segment so the rest of the loop operates Correct answer.
  2. It supplies standby power to the devices on the loop
  3. It disconnects the entire signaling line circuit until the fault is repaired
  4. It converts analog detector readings into digital values

Explanation

An isolator opens the loop on both sides of a shorted segment so the remainder of the circuit keeps communicating with the control unit. Devices on the isolated segment report as missing until the fault is corrected. This keeps a single wiring fault from disabling the whole loop.

Question 41Codes, Standards, and Referenced Documents

Which document is the primary installation standard for fire alarm systems in the United States?

  1. NFPA 101, Life Safety Code
  2. NFPA 72, National Fire Alarm and Signaling Code Correct answer.
  3. NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems
  4. NFPA 70, National Electrical Code

Explanation

NFPA 72 is the National Fire Alarm and Signaling Code and contains the installation, performance, testing, inspection, and maintenance requirements for fire alarm and signaling systems. NFPA 101 determines whether a system is required for a given occupancy, while NFPA 70 governs the wiring methods used to install it. The detailed design and installation provisions come from NFPA 72.

Question 42Codes, Standards, and Referenced Documents

Which pathway class is described as one in which a single open or ground fault causes loss of all devices downstream of the fault?

  1. Class B Correct answer.
  2. Class X
  3. Class N
  4. Class A

Explanation

A Class B pathway has no redundant return path, so a single open or ground fault disables every device on the far side of the fault. Class A provides a redundant path so the circuit continues to operate with a single open. Class X and Class N add performance features beyond that basic arrangement.

Question 43Codes, Standards, and Referenced Documents

NFPA 72 requires that fire alarm system components be:

  1. listed for the purpose by a nationally recognized testing laboratory Correct answer.
  2. acceptable to the installing contractor
  3. certified by the installing technician's employer
  4. approved by the equipment distributor

Explanation

NFPA 72 requires fire alarm equipment to be listed for its intended purpose by a nationally recognized testing laboratory such as UL. Listing confirms that the device has been evaluated to a recognized product standard and is suitable for fire alarm service. Field acceptance by a contractor, distributor, or employer does not substitute for that listing.

Question 44Codes, Standards, and Referenced Documents

Under NFPA 72's pathway classifications, a notification appliance circuit that older drawings designate as Style Z corresponds to:

  1. Class A Correct answer.
  2. Class B
  3. Class N
  4. Class X

Explanation

In the legacy NFPA 72 style designations, Style Z notification appliance circuits and Style D initiating device circuits are Class A arrangements, meaning the circuit returns to the control unit and survives a single open. Style Y and Style B designate Class B circuits. Class X and Class N are newer performance designations with no legacy style equivalent.

Question 45Codes, Standards, and Referenced Documents

To determine whether a fire alarm system is required in a particular occupancy, the designer first consults:

  1. NFPA 13
  2. NFPA 101 Correct answer.
  3. NFPA 72
  4. NFPA 25

Explanation

NFPA 101, the Life Safety Code, establishes when fire detection and alarm features are required for each occupancy classification, along with the locally adopted building code. NFPA 72 then governs how the required system is designed and installed. NFPA 13 and NFPA 25 address sprinkler design and sprinkler maintenance respectively.

Question 46Codes, Standards, and Referenced Documents

Where a commercial protected-premises fire alarm system uses a battery as its secondary power supply, NFPA 72 requires the battery to be capable of operating the system for:

  1. 12 hours of standby followed by 5 minutes of alarm
  2. 24 hours of standby followed by 30 minutes of alarm
  3. 4 hours of standby followed by 15 minutes of alarm
  4. 24 hours of standby followed by 5 minutes of alarm Correct answer.

Explanation

NFPA 72 requires the secondary supply for a commercial protected-premises system to carry the standby load for 24 hours and then operate the alarm load for 5 minutes. Longer alarm durations apply only in specific cases defined by the code. The calculated capacity must include the standby and alarm loads of all equipment served by the supply.

Question 47Codes, Standards, and Referenced Documents

In NFPA 72, the chapter that lists the other codes and standards referenced by the document is titled:

  1. Administration
  2. Fundamentals
  3. Documentation
  4. Referenced Publications Correct answer.

Explanation

Chapter 2 of NFPA 72 is Referenced Publications and identifies every outside document, such as NFPA 70 and NFPA 101, whose requirements are made part of the code. A referenced document applies only to the extent it is cited in the body of NFPA 72. The chapters on administration, fundamentals, and documentation appear later in the document.

Question 48Codes, Standards, and Referenced Documents

In NFPA 72, the word "shall" indicates a provision that is:

  1. mandatory Correct answer.
  2. optional
  3. recommended
  4. explanatory

Explanation

In NFPA codes and standards, "shall" denotes a mandatory requirement, "should" denotes a recommendation, and "may" denotes something that is permitted. Explanatory material appears in annexes and is not enforceable. This convention is defined in the code's administration chapter.

Question 49Codes, Standards, and Referenced Documents

A pathway in which a single open, short, or ground fault does not affect the operation of more than one device is classified as:

  1. Class N
  2. Class A
  3. Class X Correct answer.
  4. Class B

Explanation

Class X performance requires isolation so that a single fault of any type disables no more than the one device or segment involved, typically through addressable isolator modules. A Class A pathway survives a single open but does not limit the effect of a short to a single device. Class N is the Ethernet-based pathway classification.

Question 50Codes, Standards, and Referenced Documents

Inspection, testing, and maintenance of sprinkler system devices that interface with the fire alarm system, such as waterflow and valve tamper switches, is governed by:

  1. NFPA 25 Correct answer.
  2. NFPA 110
  3. NFPA 13
  4. NFPA 90A

Explanation

NFPA 25 is the standard for inspection, testing, and maintenance of water-based fire protection systems, including the switches that send signals to the fire alarm system. NFPA 13 covers design and installation of sprinkler systems rather than their ongoing testing. NFPA 90A addresses air handling systems, and NFPA 110 addresses emergency power supplies.