Fail-safe vs fail-secure electric locks: NFPA 101 egress rules, when to use each, and how to coordinate with the fire alarm.
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Fail-Safe vs Fail-Secure
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Fail-Safe vs Fail-Secure: Commercial Access Control Door Lock Modes Explained
A practical reference for selecting fail-safe or fail-secure electrified door hardware in a commercial access control system, including egress, fire-alarm release, and AHJ implications.