New Home Construction Environments
New home construction facilitates the location of hard-wired security system wiring and components during the early phase of the construction. Structured wiring in new homes supports most of the needs of a well-planned multizone security system. Phone lines, coaxial cable, and Category 5 cable are components of a structured wiring installation. They provide the basis for integrating the security system with the computer network and other home automation systems.
The exception is the wiring for door, window, and motion detector sensors. Inexpensive two-conductor wire must be installed in the interiors of walls between the controller location and each sensor. In addition, two-pair gauge wire must be installed for all low-voltage powered sensors such as motion detectors. One pair is used for power and the other pair is used for signalling.
Door Functional Design Specifications
Doors are protected by installing small magnetic switches inside the frame.
Burglar Alarm Door Sensor
Figure illustrates the location of the magnetic switch. A magnet isinstalled in the top of the door that keeps the switch contacts open as long as the door remains closed. An alarm is caused when this switch is disturbed by opening the door. The magnetic switch completes a circuit that is connected to the control panel. Recessed mounted models use magnets that are fitted into drilled holes, and when properly installed, recessed mounted magnetic switches are hard to notice and blend in well with the door.
Window Functional Design Specifications
A perimeter security system must include a glass protection system because magnetic switches do not protect against an intruder entering through a broken window. Glass protection systems are available in two categories: vibration and acoustical. The vibration system is mounted on the glass or on a nearby wall and detects movement of the glass. Acoustical systems, or sound discriminators, sense the sound of breaking glass. The unit can be tuned to react only to the specific frequency of glass breaking, typically 4KHz–6KHz, or it can react to any loud noise. Some manufacturers have combined vibration and sound detectors into one unit that does not activate unless both are detected. These units can be used where the normal conditions would cause a single technology detector to generate false alarms.
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