FIGURE 14.Electrical installations and wiring systems
339
Cameras may fixed movable under remote control, such those
used for motorway traffic monitoring.
A permanent record the CCTV pictures can stored and replayed by
incorporating video tape recorder into the system the practice in
most banks and building societies. 14. The escape lighting scheme should be
planned that identifiable features and obstructions are visible the
lower levels illumination which may prevail during emergency.
Escape lighting usually required local and national statutory authori-
ties under legislative powers.
Pictures from several cameras can multiplexed single co-axial
video cable, together with all the signals required for the remote control of
the camera.
Generators can have large capacity and duration, but major disadvan-
tage the delay time while the generator runs speed and takes
over the load. Typically external camera would
be enclosed weatherproof housing such those shown Fig.
Security cameras should robustly fixed and cable runs designed that
they cannot sabotaged potential intruder. some premises delay more than considered
.
Definition
Emergency lighting provided for
two reasons; illuminate escape
routes, called ‘escape’ lighting; and to
enable process activity con-
tinue after normal lights failure,
called ‘standby’ lighting. Exit
routes should clearly indicated signs and illuminated uniform
level, avoiding bright and dark areas. emergency people not always act rationally,
but well illuminated and easily identified exit routes can help reduce panic.
Standby lighting required hospital operating theatres and indus-
try, where operation process once started must continue, even the
mains lighting fails.58
CCTV camera.
Emergency lighting provided for two reasons; illuminate escape
routes, called ‘escape’ lighting; and enable process activity con-
tinue after normal lights failure, called ‘standby’ lighting.58.
Definition
Emergency lighting not required
in private homes because the occu-
pants are familiar with their surround-
ings, but public buildings people
are unfamiliar surroundings.
Using remote control, the camera can panned, tilted focused and
have its viewing screen washed and wiped. an
emergency people not always act
rationally, but well illuminated and
easily identified exit routes can help
to reduce panic. Standby lighting may also required for security rea-
sons.
Emergency lighting not required private homes because the occupants
are familiar with their surroundings, but public buildings people are in
unfamiliar surroundings. most premises the alternative
power supply would from batteries, but generators may also used.
Emergency supplies
Since emergency occurring building may cause the mains supply
to fail, the emergency lighting should supplied from source which
is independent from the main supply. The cash points public buildings may need illuminated all
times discourage acts theft occurring during mains lighting failure.
Emergency lighting (BS 5266 and 1838)
Emergency lighting should planned, installed and maintained the
highest standards reliability and integrity, that will operate satisfac-
torily when called into action, matter how infrequently this may be
