FIGURE 14. Most
systems will trigger the wires are cut and sounders should mounted in
any easy-to-see but difficult-to-reach position.Basic Electrical Installation Work
338
an alarm system thought deter the casual intruder and ringing alarm
encourages neighbours and officials investigate possible criminal act.
Closed circuit television
Closed circuit television (CCTV) now integral part many security
systems. 14. Nickel–cadmium
rechargeable cells are usually mounted the sounder housing box. All external sensors and warning devices radi-
ate from the control panel.57
Intruder alarm control panel with remote keypad. Installing intruder alarm system tells
the potential intruder that you intend make his job difficult, which in
most cases encourages him look for easier pickings.
SUPPLY
The supply the intruder alarm system must secure and this usually
achieved a. This possible using infra-red lighting which
renders the scene under observation visible the camera while the
human eye appears total darkness.1). mains supply and battery back-up. CCTV systems range from single monitor with just one camera
dedicated monitoring perhaps hotel car park, through systems with
many internal and external cameras connected several locations for
monitoring perhaps shopping precinct.
Design considerations
It estimated that there now chance being burgled, but the
installation security system does deter potential intruder.
The type and extent the intruder alarm installation, and therefore the cost,
will depend upon many factors including the type and position the build-
ing, the contents the building, the insurance risk involved and the peace
of mind offered alarm system the owner occupier the building. avoid triggering the alarm you
enter leave the premises, there are exit and entry delay times allow
movement between the control panel and the door.
CCTV cameras are also required operate total darkness when flood-
lighting impractical.
The designer must ensure that intruder cannot sabotage the alarm
system cutting the wires pulling the alarm box from the wall. Every
home Britain will almost certainly contain electrical goods, money or
valuables value intruder.
CONTROL PANEL
The control panel, such that shown Fig.57, the centre the
intruder alarm system. The system switched off the control
panel using switch coded buttons.
Intruder alarm circuits are Band circuits and should, therefore, segre-
gated from mains supply cables which are designated Band circuits or
insulated the highest voltage present run common enclosure with
Band cables (IEE Regulation 528.c.
