F80 F80 Code Requirements 3

Question 1

What is the maximum allowable voltage drop on a fire alarm initiating device circuit (IDC) under NFPA 72?

Accepted Answer

2 volts

Answer

NFPA 72 limits voltage drop on initiating device circuits to no more than 2 volts to ensure proper device operation.

Question 2

According to NFPA 72, in which occupancy type must all corridors be equipped with smoke detectors as a minimum requirement?

Accepted Answer

Health care occupancies

Answer

Health care occupancies require smoke detectors in all corridors due to the higher life-safety risk for occupants who may not be able to self-evacuate.

Question 3

Under NFPA 72, what is the required minimum wire gauge for a Class A fire alarm circuit?

Accepted Answer

18 AWG

Answer

NFPA 72 requires a minimum of 18 AWG conductors for fire alarm circuits; the manufacturer's listing may require larger gauges.

Question 4

A Class B initiating device circuit (IDC) differs from a Class A IDC primarily because Class B circuits:

Accepted Answer

Require end-of-line resistors and do not provide fault detection beyond the first open

Answer

Class B IDCs use end-of-line resistors for supervision but lose contact with devices beyond an open fault, unlike Class A circuits that loop back.

Question 5

According to the F80 code framework, which document must be submitted to the Authority Having Jurisdiction (AHJ) before fire alarm system installation begins?

Accepted Answer

Shop drawings and specifications

Answer

Shop drawings and specifications must be submitted to and approved by the AHJ prior to installation of a fire alarm system.

F80 Practice Test

F80 Practice Test

F80 F80 Code Requirements 3