NICET Electrical Systems for Fire Protection 3

Question 1

What wire gauge is most commonly used for fire alarm initiating device circuits?

Accepted Answer

22 AWG

Answer

18 AWG wire is most commonly specified for fire alarm initiating device circuits, balancing resistance, cost, and mechanical durability.

Question 2

In a two-wire smoke detector circuit, how is the detector powered?

Accepted Answer

From the same pair of wires that carries the alarm signal

Answer

Two-wire smoke detectors receive operating power and transmit alarm signals over the same pair of wires connected to the initiating device circuit.

Question 3

What is the purpose of an isolation module in an addressable fire alarm loop?

Accepted Answer

Isolate a section of the loop that develops a short circuit while keeping the rest operational

Answer

Isolation modules detect and isolate short circuits on a segment of an addressable loop, allowing the remainder of the loop to continue operating normally.

Question 4

Which type of power supply provides the MOST reliable protection against AC power interruptions for fire alarm systems?

Accepted Answer

Online UPS with sealed lead-acid batteries

Answer

An online UPS provides instantaneous, seamless switchover to battery power during AC outages, ensuring uninterrupted fire alarm system operation.

Question 5

What does a ground fault trouble signal on a fire alarm panel indicate?

Accepted Answer

An unintended electrical connection between a circuit conductor and ground

Answer

A ground fault indicates that one of the fire alarm circuit conductors has an unintended connection to a grounded conductor or metallic conduit.

NICET - National Institute for Certification in Engineering Technologies Practice Test

NICET - National Institute for Certification in Engineering Technologies Practice Test

NICET Electrical Systems for Fire Protection 3