C7 Fire Alarm System Installation 3 — Questions and Answers
Question 1: What is the purpose of a Class A wiring configuration in a fire alarm system compared to Class B?
- Class A uses fewer conductors
- Class A allows the system to continue operating past a single open fault (Correct answer)
- Class A eliminates the need for end-of-line resistors
- Class A reduces installation cost
Correct answer: Class A allows the system to continue operating past a single open fault
Class A (Style D/E) wiring loops back to the panel, allowing the system to continue operating past a single open-circuit fault by providing an alternate signal path.
Question 2: When installing horn/strobe notification appliances in a corridor under ADA and NFPA 72, the strobe must be mounted with its lens center at what height?
- 60 inches AFF
- 80 inches AFF or 6 inches below the ceiling, whichever is lower (Correct answer)
- 48 inches AFF
- 96 inches AFF
Correct answer: 80 inches AFF or 6 inches below the ceiling, whichever is lower
NFPA 72 requires visible notification appliances to be mounted with the lens center between 80 inches AFF and 6 inches below the ceiling, whichever is lower.
Question 3: A fire alarm control panel (FACP) loses AC primary power. How long must the system's standby batteries be capable of powering the system under NFPA 72?
- 4 hours
- 8 hours
- 24 hours followed by 5 minutes of alarm (Correct answer)
- 48 hours followed by 15 minutes of alarm
Correct answer: 24 hours followed by 5 minutes of alarm
NFPA 72 requires fire alarm systems to have sufficient battery standby capacity for 24 hours in standby followed by 5 minutes in full alarm.
Question 4: Which type of fire detector is best suited for detecting slow, smoldering fires that produce large quantities of visible smoke particles?
- Rate-of-rise heat detector
- Fixed-temperature heat detector
- Ionization smoke detector
- Photoelectric smoke detector (Correct answer)
Correct answer: Photoelectric smoke detector
Photoelectric smoke detectors respond more quickly to large, visible smoke particles produced by slow, smoldering fires than ionization detectors.
Question 5: What California state license classification allows a contractor to legally install fire alarm systems as the primary scope of work?
- C-10 Electrical
- C-16 Fire Protection
- C-7 Low Voltage Systems (Correct answer)
- B General Building
Correct answer: C-7 Low Voltage Systems
The California C-7 Low Voltage Systems Contractor license authorizes installation of fire alarm and signaling systems as a primary scope under low voltage work.
Question 6: During a fire alarm system commissioning test, a technician performs a 'walk test.' What is the primary purpose of this test?
- Verify battery backup capacity
- Confirm each initiating device activates and is correctly identified at the panel (Correct answer)
- Test the integrity of all conduit runs
- Measure voltage drop across all circuits
Correct answer: Confirm each initiating device activates and is correctly identified at the panel
A walk test confirms that each initiating device (smoke, heat, pull station) activates the panel correctly and is properly labeled/programmed.
Question 7: When installing fire alarm wiring in a building with a concrete ceiling, what method is required to support conduit runs per NEC Article 300?
- Conduit must be surface-mounted only
- Conduit must be supported at intervals not exceeding 10 feet and within 3 feet of each box (Correct answer)
- Conduit may be freely suspended without support
- Conduit must be enclosed in EMT only
Correct answer: Conduit must be supported at intervals not exceeding 10 feet and within 3 feet of each box
NEC 300.11 requires raceways to be supported at regular intervals (typically every 10 feet for conduit) and within 3 feet of each box or enclosure.
C7 Fire Alarm System Installation 3
What is the purpose of a Class A wiring configuration in a fire alarm system compared to Class B?