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  2. Electricity on Shabbat - Wikipedia

    en.wikipedia.org/wiki/Electricity_on_Shabbat

    It is not permitted to open the door if the light will turn on because, unlike with the motor running, the light turning on is a Biblical prohibition whereas the motor running may be a Rabbinic prohibition, and also, the light is turned on immediately as an effect of opening the refrigerator whereas the motor turning on is an indirect effect. [33]

  3. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    The door holders release, allowing the doors to close automatically using door closers. [1] [2] The electric power to keep the doors open is typically 12 VDC, 24 VDC (common), 24 VAC, 120 VAC, or 240 VAC. The closed doors may or may not mechanically latch or lock in the closed position.

  4. Lockrod - Wikipedia

    en.wikipedia.org/wiki/Lockrod

    Today, sometimes confused with locking bars or bar locks, lockrods have evolved to secure virtually every trailer or container that has a swing door (a door that swings open and closed rather than rolls up). Roll up doors are sometimes used in place of swing doors on trailers that make shorter haul deliveries. Diagram of a refrigerator door ...

  5. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    Some alarm systems serve a single purpose of burglary protection; combination systems provide fire and intrusion protection. Intrusion-alarm systems are combined with closed-circuit television surveillance (CCTV) systems to record intruders' activities and interface to access control systems for electrically locked doors. There are many types ...

  6. How Home Automation Is Revolutionizing Energy Efficiency for ...

    www.aol.com/home-automation-revolutionizing...

    “They can track the rate your utility is charging you for the energy (which often changes three or four times a day), and make sure your smart refrigerator is cooling and your smart water heater ...

  7. Pressure switch - Wikipedia

    en.wikipedia.org/wiki/Pressure_switch

    Pressure sensitive mats can be used to operate electrically operated doors, or as part of an interlock system to ensure machine operators are clear of dangerous areas of a process before it operates. Pressure sensitive mats can be used to detect persons walking over a particular point, as part of a security alarm system or to count attendance ...