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2. Door security - Wikipedia

   en.wikipedia.org/wiki/Door_security

   Door security. A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home ...

3. Safety harness - Wikipedia

   en.wikipedia.org/wiki/Safety_harness

   Safety harness. A safety harness is a form of protective equipment designed to safeguard the user from injury or death from falling. The core item of a fall arrest system, the harness is usually fabricated from rope, braided wire cable, or synthetic webbing. It is attached securely to a stationary object directly by a locking device or ...

4. Bonding jumper - Wikipedia

   en.wikipedia.org/wiki/Bonding_jumper

   Bonding jumper. A bonding jumper is a reliable conductor to ensure the required electrical conductivity between metal raceways required to be electrically connected. [ 1] Wide metal bonding straps around the joints of a radio antenna mast.

5. Electromagnetic lock - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_lock

   Operation. The principle behind an electromagnetic lock is the use of electromagnetism to lock a door when energized. The holding force should be collinear with the load, and the lock and armature plate should be face-to-face to achieve optimal operation. The magnetic lock relies upon some of the basic concepts of electromagnetism.

6. Fail-safe - Wikipedia

   en.wikipedia.org/wiki/Fail-safe

   Fail-secure, also called fail-closed, means that access or data will not fall into the wrong hands in a security failure. Sometimes the approaches suggest opposite solutions. For example, if a building catches fire, fail-safe systems would unlock doors to ensure quick escape and allow firefighters inside, while fail-secure would lock doors to ...

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