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Formed in 1971 as the National Supervisory Council for Intruder Alarms, as a product certification organisation for installers of security alarms / burglar alarms, it merged in the 1990s with the Security Systems Inspectorate (SSI) to become the National Approval Council for Security Systems (NACOSS), and later merged with the Inspectorate of the manned guarding Security Industry (ISI), which ...
A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school.
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.
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A voice-activated radio-dispatched alarm, or VARDA-alarm, is a type of burglar alarm that, when activated or "tripped", broadcasts the type of the alarm and the transmitter location over the local police radio frequency using a pre-recorded audio message. [1] In 1968, the voice-activated radio dispatched alarm (VARDA), was invented.
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