UL 365

The Underwriters Laboratories' UL 365 is a safety standard that governs the construction, performance, and maintenance of police station-connected burglar alarm units and systems. These systems are designed primarily for use in mercantile premises, including mercantile safes and vaults, as well as bank safes and vaults.

The standard specifies that these alarm systems include protective circuits and devices that connect through a control apparatus to a sounding device. This device can be mounted either inside or outside the premises housing the protected property. Activation of the alarm by intrusion or disturbance results in a signal being transmitted to a constantly-manned police department and the sounding device being activated until it is manually deactivated, power is exhausted, or an automatic timer shuts it off.

Additionally, the operation of these systems may be partially controlled by the property owner, but maintenance and regular inspection by the installing company are mandatory. This includes prompt responses to service calls from the owner or the police.

The alarm transmission methods covered under UL 365 can be categorized under standard line security or encrypted line security. The systems are required to operate within the limits of Class 2 remote control and signal circuits as defined by the National Electrical Code, NFPA 70.

The fifth edition of this standard, issued on January 31, 2018, was notable for expanding the media to include website information. However, as of January 31, 2023, UL 365 has been superseded by the second edition of UL 2610, which now covers the standards for commercial premises security alarm units and systems, incorporating the provisions that were once under UL 365.