Fire Alarm and Signaling Systems

8 - 12 questions on the Fire Protection PE Exam

Fire Alarm and Signaling Systems are worth about 8 to 12 questions and are built around NFPA 72. Expect a mix of code-lookup questions and calculations. Section 5 of the Fire Protection PE Textbook covers system selection through the number-crunching that trips up most examinees.

What the Textbook Covers: Fire Alarm & Signaling

The NCEES specification lists four sub-areas:

System Selection

Addressable systems, emergency communication systems (ECS), releasing service, mass notification, and emergency responder communication.

Design Criteria

Device location and spacing, system interfaces, and the sequence of operations.

Principal Components

Selecting initiating devices, notification appliances, control units and power supplies.

Calculations

Voltage drop, secondary (battery) supply sizing, notification coverage, and detector response.

A Taste: Secondary Power (Battery) Sizing

NFPA 72 requires a secondary power supply that can run the system in standby for a required period (commonly 24 hours) and then drive it in alarm for several minutes. You sum the standby current over the standby hours and the alarm current over the alarm minutes (in amp-hours), apply a derating/safety factor, and size the battery accordingly.

The textbook walks through a full battery calculation and a voltage-drop check for a notification circuit — two of the most common calculation questions on this topic.

This is only a preview. The full explanation, diagrams, worked examples and practice problems are in the Fire Protection PE Textbook.

Get the Full Picture

Fire alarm calculations reward practice. Get the worked examples and practice exams:

Fire Protection PE Textbook Fire PE Exam Bundle (3 Exams) Online Fire PE Course

FIRE ALARM & SIGNALING