NFPA 72 Section Topics

Going into more details for specific section topics from NFPA 72

18.4.2.1*

The alarm audible signal pattern used to notify the building occupants of the need to evacuate or relocate shall be standard alarm evacuation signal consisting of a three-pulse temporal pattern in accordance with ASNI/ASA S3.41, Audible Emergency Evacuation (E2) and Evacuation Signals With Relocation Instructions (ESRI).

18.4.3.2

Where an audible is required, the carbon monoxide signal shall be a four-pulse temporal pattern and comply with the following: see NFPA 72

21.2.4*

Emergency control function interface devices shall be located within 3ft (0.9m) of the component controlling the emergency control function where the control circuit is not configured as a Class D circuit.

21.3.3.1

Unless otherwise permitted by 21.3.3.2 or required by AHJ, only the elevator lobby, hoistway, machine room, machinery space, control room, and control space smoke detectors or other automatic fire detection as permitted by 21.3.10 shall be used to initiate Elevator Phase I Emergency Recall Operation.

21.3.5.1

A lobby smoke detector shall be located on the ceiling within 21ft (6.4m) of the centerline of each elevator door within the elevator bank under control of the detector.

21.4.1

Disconnect the main line power supply to the affected elevator upon or prior to the activation of sprinkler(s), the detector(s) shall have both a lower temperature rating and a lower response time index (RTI) as compared to the sprinkler(s).

21.4.2*

The heat detector(s) specified in 21.4.1 shall be placed within 24in. (610mm) of each sprinkler.

21.10.1*

Upon fire alarm activation, electrically locked doors in a required means of egress shall unlock in the direction of egress where required by other laws, codes, and governing standards.

Mass Notification Layer 1 (24.3.8*)

Notification of occupants by systems/equipment installed inside a building and controlled only by authorized users (in-building)

Mass Notification Layer 2 (24.3.8*)

Notification of occupants on the exterior of a building and controlled only by authorized users (wide-area)

Mass Notification Layer 3 (24.3.8*)

Notification of personnel through individual measures (distributed recipient)

Mass Notification Layer 4 (24.3.8*)

Notification of personnel by public measures (broadcast radio. television, and so forth)

24.3.14.4.2*

For systems employing relocation or partial evacuation, the requirements of 24.3.14.4.3 through 24.3.14.4.6.4 shall apply to the communication and control circuit pathways.

24.3.14.4.3*

Where the building is constructed with a fire resistance rating that is equal to or greater than 2 hours, the installation shall comply with 24.3.14.4.6 or provide a pathway survivability of Level 2 or Level 3.

24.4.2.1*

Unless otherwise permitted by 24.48, evacuation messages shall be preceded and followed by a minimum of two cycles of the emergency signal specified in 18.4.2 or 18.4.3.

24.4.8.3

Where the system is used to transmit relocation instructions or other fire emergency non-evacuation messages, a 1-second to 3-second alert tone followed by a message (or messages where multi-channel capability is used) shall be provided.

10.6.7.2.9

The secondary power supply capacity for in-building mass notifications systems shall be capable of operating the system under quiescent load for a minimum of 24 hours.

10.6.7.2.10

The secondary power supply for in-building mass notification systems shall be capable of operating the system during emergency conditions for a period of 15 minutes at maximum connected load.

27.4.3.8

Alarm boxes shall meet one of the requirements:

1) Publicly accessible boxes

2) Auxiliary boxes

3) Master boxes

27.6.3.2.2.1*

Auxiliary alarm systems shall be local-energy type with the following requirements:
1) Local-energy-type systems shall be permitted to be of the coded or noncoded type.

2) See NFPA 72

3) See NFPA 72

27.6.3.2.2.2

Application of Public Emergency Alarm Reporting Systems with Auxiliary Alarm Systems:
1) Wired local energy type

2) Wireless local energy type

3) Telephone series local energy type

27.6.3.2.2.3

Application of Initiating Devices with Auxiliary Alarm Systems:

1) Manually actuated alarm-initiating device local energy type

2) Waterflow or actuation of the fire-extinguishing system(s) or suppression system(s) local energy type

3) Automatic detection devices local energy type

27.6.6.2

Each wireless box shall automatically transmit a test message a last once in each 24-hour period.

27.6.6.9

The primary power source for wireless boxes shall be permitted to be from one or more of the following, as approved by the AHJ:
1) Utility distribution system

2) Solar photovoltaic power system

3) user power

4) Self-powered, using either an integral battery or other stored energy source

27.7.1.2.2

Overhead, underground, or direct-burial cables shall be specifically approved for the purpose.