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  2. Dual loop - Wikipedia

    en.wikipedia.org/wiki/Dual_loop

    Dual-loop is a method of electrical circuit termination used in electronic security applications, particularly modern intruder alarms. It is called 'dual-loop' because two circuits (alarm and anti-tamper) are combined into one using resistors. Its use became widespread in the early 21st century, replacing the basic closed-circuit system, mainly ...

  3. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    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. Security alarms protect against burglary or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and prison alarms.

  4. Standards for Alarm Systems, Installation, and Monitoring

    en.wikipedia.org/wiki/Standards_for_Alarm...

    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. [15]

  5. Passive infrared sensor - Wikipedia

    en.wikipedia.org/wiki/Passive_infrared_sensor

    When used as part of a security system, the electronics in the PIR typically control a small relay. This relay completes the circuit across a pair of electrical contacts connected to a detection input zone of the burglar alarm control panel. The system is usually designed such that if no motion is being detected, the relay contact is closed—a ...

  6. EXPLAINER: Will burglar alarms still work after 3G shutdown?

    www.aol.com/finance/explainer-burglar-alarms...

    An alarm-industry lobbying group estimates that 1.5 million customers still need to upgrade their fire or burglar alarms, while about half a million have medical alert devices that run on 3G; it ...

  7. Home security - Wikipedia

    en.wikipedia.org/wiki/Home_security

    Door and window sensors are also implemented in most home security systems. One part of the system is installed on the door or window itself while the other part is installed on the frame of the door or window. The two part system connects securely when a door or window is closed, creating a security circuit. [5]

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