In
a normally open circuit, the alarm call points are connected parallel with
each other that when any alarm point initiated the circuit completed
and the sounder gives warning fire.
Exposed conductive parts The metalwork electrical appliance the trunking and conduit an
electrical system which can touched because they are not normally live,
but which may become live under fault conditions.
Fire alarm circuits Fire alarm circuits are wired either normally open normally closed.Glossary terms
377
Emergency lighting Emergency lighting not required private homes because the occu-
pants are familiar with their surroundings, but public buildings people
are unfamiliar surroundings.3 6. normally closed circuit, the alarm
call points are connected series normally closed contacts.
Fire Fire chemical reaction which will continue fuel, oxygen and heat are
present. Tightening the bolt draws expanding bolt
inside the split iron shell, forcing the iron expand and grip the masonry.
.
Flashpoint The lowest temperature which sufficient vapour given off from a
flammable substance form explosive gas–air mixture called the
flashpoint.
First aider first aider someone who has undergone training course administer
first aid work and holds current first aid certificate. emergency people not always act
rationally, but well-illuminated and easily identified exit routes can help to
reduce panic.
Extraneous conductive parts The structural steelwork building and other service pipes such gas,
water, radiators and sinks.
Rawlbolts are for heavy-duty masonry fixings.
Faraday’s law Faraday’s law which states that when conductor cuts cut mag-
netic field, emf induced that conductor.
First aid First aid the initial assistance treatment given casualty for any
injury sudden illness before the arrival ambulance, doctor other
medically qualified person.
Ferrous word used describe all metals which the main constituent iron.
Expansion bolts The most well-known expansion bolt made Rawlbolt and consists of
a split iron shell held together one end steel ferrule and spring
wire clip the other end.
Fault protection Fault protection provided protective equipotential bonding and auto-
matic disconnection the supply (by fuse miniature circuit breaker,
MCB) accordance with IEE Regulations 411. When the
alarm initiated, break occurs the wiring, the alarm activated.
Emergency switching Emergency switching involves the rapid disconnection the electrical
supply single action remove prevent danger.
Escape/standby lighting 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
