Unit Overview
Electrical Screw Driver
Wire Strippers
Spirit Level
Wire Cutters
Test Meter
Measuring Tape
Light Switch
Ceiling Rose
Fused Spur
Plastic Conduit
Back Box
Surface Box
Cable Clip
Risk Assessment
Selection of Tools


Description / Function

There is a wide range of electrical cable available, the most common

type we use is twin and earth cable, this refers to the the cable having two wires that are insulated and an exposed earth wire. The wires are colour coded in the following way, red and brown are live and black or blue are neutral, the earth wire is yellow and green, the earth wire has two different colours so it's easy to spot in low light, as the earth wire offers a level of protection it is essential that this wire is correctly installed.


The wire is insulated to protect you from electrocution or electric shock, where the earth wire is not insulated, earth sheathing needs to be added to make the wiring safe.


Safe Use

No bear or exposed copper wire should be visible, all wires should run vertically up and down from sockets and switches, expect at floor and ceiling heights, this is to try and make it easier to located cables at a later date and reduces the chance of someone hitting the cable with a nail or screw when hanging a picture or putting up shelves.


part pIt is essential to use the correct width cable for the application you are carrying out.

1.5mm cable should be used for lights as it does not need to carry the same load as a socket.

2.5mm cable should be used for sockets as it can handle a higher load.

4.5mm cable needs to be used for high voltage applications such as cookers.


If for example you used 1.5mm cable for sockets or cookers the cable may overheat and cause an electrical fire.



Wire is bought on reels, normally 25m, 50m, or 100m in length and can become a trip hazard if not stored properly, you should only take as much of the reel as you need at any one time.



Whilst copper is expensive it is a very suitable material for electrical cable as it has good conductive properties and is not brittle like steel, this means is should not break when being bent around corners. As the cable width increases the cable becomes harder to cut and bend into place.