This category covers signal receiving, recording and supervisory units intended for permanent use within a central station or subsidiary station and associated subscriber's control units and the like to be installed within protected property.

This category covers control units and accessories intended to be used as part of a household fire-warning system.

The basic standard used to investigate products in this category is UL 985, "Household Fire-warning System Units."

Household Burglar Alarm System Units (Residential Burglary)

This category covers the individual units that may be interconnected to form an electrically operated household burglar alarm system. These units include a main control unit (with integral or separate power supply), intrusion detection devices (contacts, motion detectors, sound detectors, etc.), and alarm indicating devices (bells, relays, and the like).

Police Station Alarm Units  (Commercial Burglary)
This category covers police station alarm units used to control burglar alarm circuits and a local audible alarm sounding device at protected premises, and to transmit an alarm signal from the protected premises to a police station or to a central station. The units are acceptable for use to form a Grade A, AA, AA encryption, B, BB or BB encryption police station connected system in bank safes and vaults, and to form a Grade A, AA or AA encryption police station connected system in mercantile premises or mercantile safes and vaults as indicated in the individual Listings. They may be used with units Listed under Local Alarm Units (AOTX). The transmission methods used to connect the protected premises to the police station or central station are designated as basic or intermediate line security suitable for Grades A or B, or high line security suitable for Grades AA, AA encryption, BB or BB encryption .

Proprietary Alarm Units (Commercial Burglary)
This category covers proprietary burglar alarm systems which are electrical monitoring systems designed to provide status indication of burglar alarm actuating devices. All equipment is intended to be operated and maintained by competent and experienced personnel responsible to the owner of the protected premise.

Holdup Alarm Units
This category covers hand and foot operated initiating devices, control units, coded and non-coded transmitters and remote station units to receive signals from holdup alarm initiating devices.

The devices are acceptable to form a manual or semiautomatic holdup alarm system. See Holdup Alarm Systems (MTCV) for further information.

The basic standard used to investigate products in this category is UL 636, "Holdup Alarm Units and Systems"

ANET