[RFI] Apartment complex RFI associated with Fire Alarm Control Panel circuit

Steve Kurtzman stevew7sjk at gmail.com
Fri Mar 8 13:06:00 EST 2019

Fire alarm panels are required to have battery backup that keeps them
running normally for 24 hours.  So the noise must be coming from the AC
power supply itself.

The entity to notify would be the fire alarm monitoring service, if any.
They would receive a "trouble" signal when the AC power is turned off.

Circuit breakers feeding fire alarm control panels are normally required to
have their handles painted red, but it is rarely done.  The CB handle lock
is optional but used quite often.

Steve W7SJK

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