Part the IEE Regulations tells that electrical equipment and mater-
ials must chosen that they are suitable for the installed condi-
tions, taking into account temperature, the presence water, corrosion,
mechanical damage, vibration exposure solar radiation. These qualities often make the only cable choice
Steel core
Aluminium conductors
FIGURE 6. This might battery giving d.4
132kV overhead cable construction.
Choosing appropriate wiring system
An electrical installation made many different electrical circuits,
lighting circuits, power circuits, single-phase domestic circuits and three-
phase industrial commercial circuits.c.Basic Electrical Installation Work
128
Component parts electrical circuit
For piece electrical equipment work efficiently and effectively must
be correctly connected electrical circuit. These two types of
cable are shown Figs 6.
(direct current) supply the mains supply which a.
MI cables are waterproof, heatproof and corrosion resistant with some
mechanical protection. might electric lamp, electrical appliance, elec-
tric motor i-pod. (alternating
current)
● source circuit protection.1 and 6. Therefore,
PVC insulated and sheathed cables are suitable for domestic installations
but for cable requiring mechanical protection and suitable for burying
underground, PVC/SWA cable would preferable. This might simple on/off switch
but might also dimmer thermostat
● and load. what electrical circuit?
An electrical circuit has the following five components shown Fig. 6. These carry voltage and current to
power the load
● means control the circuit. This might fuse circuit breaker
which will protect the circuit from ‘overcurrent’
● the circuit conductors cables.c.2 this chapter.
.5:
● source electrical energy. This something which needs electricity make it
work.
Whatever the type circuit, the circuit conductors are contained within
cables enclosures
