3.0—Home Security and Surveillance Systems
3.0—Home Security and Surveillance Systems
3.0—Home Security and Surveillance Systems
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136<br />
Chapter<br />
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3<br />
Equipment Functionality <strong>and</strong> Specifications<br />
Each component of a home security <strong>and</strong> surveillance system has a specific<br />
function to perform. The basic security system includes a control panel connected<br />
by cables to sensors at various locations throughout the home. A<br />
perimeter protection system must include sensors at every opening, including<br />
doors, windows, garage doors <strong>and</strong> windows, <strong>and</strong> doors to crawl spaces. A<br />
keypad is the device that provides a control interface for the residents to arm<br />
<strong>and</strong> disarm the system using a programmed access code <strong>and</strong> also to monitor<br />
the status of the system.<br />
Door Functional Design Specifications<br />
Doors are protected by installing small magnetic switches inside the frame.<br />
Figure 3.1 illustrates the location of the magnetic switch. A magnet is<br />
installed in the top of the door that keeps the switch contacts open as long<br />
as the door remains closed. An alarm is caused when this switch is disturbed<br />
by opening the door. The magnetic switch completes a circuit that is<br />
connected to the control panel. Recessed mounted models use magnets that<br />
are fitted into drilled holes, <strong>and</strong> when properly installed, recessed mounted<br />
magnetic switches are hard to notice <strong>and</strong> blend in well with the door.<br />
Figure 3.1 Magnetic door switch.<br />
Window Functional Design Specifications<br />
A perimeter security system must include a glass protection system because<br />
magnetic switches do not protect against an intruder entering through a broken<br />
window. Glass protection systems are available in two categories: vibration