Electrical Systems for Fire Protection Flashcards
6 cards from real NICET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrical Systems for Fire Protection flashcards as text
Which grounding requirement applies to fire alarm control equipment per NFPA 72?
Answer: Equipment must be grounded in accordance with NFPA 70 (NEC)
NFPA 72 requires fire alarm control equipment to be grounded in accordance with NFPA 70 (the National Electrical Code).
What is the minimum standby battery capacity required for a fire alarm system per NFPA 72?
Answer: 24 hours standby plus 5 minutes alarm
NFPA 72 requires fire alarm systems to have batteries capable of operating the system in standby mode for 24 hours followed by 5 minutes of full alarm.
A supervised circuit in a fire alarm system detects which condition?
Answer: Open circuits, short circuits, and ground faults
Supervised circuits continuously monitor for open circuits, short circuits, and ground faults, generating a trouble signal if any fault is detected.
What is the maximum resistance allowed on a single initiating device circuit for most fire alarm systems?
Answer: 50 ohms
Most fire alarm control panels specify a maximum loop resistance (commonly 50 ohms) for initiating device circuits to ensure reliable signal transmission.
Under NEC Article 760, which installation method is NOT permitted for PLFA cables in ducts used for environmental air?
Answer: FPL cable exposed in plenum space
FPL (standard) cables cannot be run exposed in plenums; only FPLP (plenum-rated) cables or cables in metal conduit are permitted in plenum spaces.
What device protects a fire alarm control panel from voltage surges on incoming power lines?
Answer: Transient voltage surge suppressor (TVSS)
A transient voltage surge suppressor protects the fire alarm control panel from lightning-induced and other voltage transients on power and signal lines.