4
132kV overhead cable construction. These qualities often make the only cable choice
Steel core
Aluminium conductors
FIGURE 6. This might fuse circuit breaker
which will protect the circuit from ‘overcurrent’
● the circuit conductors cables.Basic Electrical Installation Work
128
Component parts electrical circuit
For piece electrical equipment work efficiently and effectively must
be correctly connected electrical circuit.
. what electrical circuit?
An electrical circuit has the following five components shown Fig.c. might electric lamp, electrical appliance, elec-
tric motor i-pod. 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.1 and 6.5:
● source electrical energy. These two types of
cable are shown Figs 6.
MI cables are waterproof, heatproof and corrosion resistant with some
mechanical protection. These carry voltage and current to
power the load
● means control the circuit.c.
Whatever the type circuit, the circuit conductors are contained within
cables enclosures.2 this chapter. (alternating
current)
● source circuit protection. This might battery giving d. This something which needs electricity make it
work.
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.
(direct current) supply the mains supply which a.
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. This might simple on/off switch
but might also dimmer thermostat
● and load. 6
