NFPA 731 Glass Break Sensors.

A glass break sensor detects breakage of any portion of a glass window or windows to which it is attached or adjusted to protect.
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A glass break sensor detects breakage of any portion of a glass window or windows to which it is attached or adjusted to protect.

A glass break sensor is designed to detect breakage of any portion of a glass window or windows to which it is attached or adjusted to protect.

Glass break sensors must comply with applicable standards, such as ANSI/UL 639, Standard for Safety for Intrusion-Detection Units.

According to UL 639, Section 65.1.1, “A glass breakage detector shall detect breakage of any portion of a glass window or windows to which it is attached or adjusted to protect.”

Below is a sample of NFPA 731. For the complete section, see the actual NFPA 731 text at NFPA.ORG. Once there, click on the free access link to the latest edition of NFPA 731.

5.3.3.1.6 Glass Break Sensors.

5.3.3.1.6.1 Glass break sensors shall be in compliance with applicable standards, such as ANSI/UL 639, Standard for Safety for Intrusion-Detection Units.

5.3.3.1.6.2 Glass break sensors shall include but not be limited to the following types:

(1) Shock

(2) Audio

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NFPA 731 Glass Break Sensors.

Below is a Real Question from our Electrical Continuing Education Courses for Electrical License Renewal:

Which of the following is true regarding glass break sensors?

A: Glass break sensors shall not be of the shock type.
B: Glass break sensors are permitted to be of the audio type.
C: Glass break sensors must be of the visual type.
D: A glass breakage sensor shall detect cracks in any window to which it is attached or adjusted to protect.
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