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Burglar alarms are now a standard part of the equipment for businesses, and are installed by electricians in shops, offices, industrial estates as well as homes.

Security alarm systems range from simple self-install kits to top of the range networks that require professional installation, but they all stem from the same basic design.

Every burglar alarm comprises three main components:

• A Control Panel (CP)
• One or more Detectors
• One or more methods of signalling that an alarm has occurred

The simplest design has a basic electric circuit built into an entry way. To turn the electricity on or off, part of the circuit is either opened or closed.

When opening or closing a light circuit, you hit the switch. In an alarm, the switch is present to detect intrusion by a door or window opening. Burglar alarms fall into two categories: