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2. Perimeter fence - Wikipedia

   en.wikipedia.org/wiki/Perimeter_fence

   Two types of security systems Once you understand the risk you are exposed to, you proceed with the definition of a customized perimeter security system design. The security system is the set of all the methods, procedures, services, which allow, by the adoption of deterrent and protection methods, to reduce the risk.

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4. Barbed wire - Wikipedia

   en.wikipedia.org/wiki/Barbed_wire

   The most important and most time-consuming part of a barbed wire fence is constructing the corner post and the bracing assembly. A barbed wire fence is under tremendous tension, often up to half a ton, and so the corner post's sole function is to resist the tension of the fence spans connected to it. The bracing keeps the corner post vertical ...

5. Fence - Wikipedia

   en.wikipedia.org/wiki/Fence

   Pool fence; Snow fence; School fence; Security fence for schools in Korea. A balustrade or railing is a fence to prevent people from falling over an edge, most commonly found on a stairway, landing, or balcony. Railing systems and balustrades are also used along roofs, bridges, cliffs, pits, and bodies of water.

6. Security alarm - Wikipedia

   en.wikipedia.org/wiki/Security_alarm

   A dual signaling communication device is attached to a control panel on a security installation and is the component that transmits the alarm to the ARC. It can do this in a number of different ways, via the GPRS radio path, via the GSM radio path or via the telephone line/or IP.

7. Electric fence - Wikipedia

   en.wikipedia.org/wiki/Electric_fence

   A "stun–lethal" fence may also consist of two fences; one set of wires forming a conventional pulsed DC non-lethal fence, the second set (interleaved with the first) forming a 6.6 kV AC lethal fence, energized when the DC fence detects an intruder. Alternatively it may consist of a single, AC or pulsed DC fence capable of running in "safe ...