Cable Sizing ~ the size of a conductor wire can be calculated
taking into account the maximum current the conductor will have
to carry (which is limited by the heating effect caused by the
resistance to the flow of electricity through the conductor) and
the voltage drop which will occur when the current is carried. For
domestic electrical installations the following minimum cable
specifications are usually suitable †All the above ratings are for the line and neutral conductors which
will be supplemented with a circuit protective conductor as shown
on page 792.
Electrical Accessories ~ for power circuits these include cooker
control units and fused switch units for fixed appliances such as
immersion heaters, water heaters and central heating controls.
Socket Outlets ~ these may be single or double outlets, switched
or unswitched, surface or flush mounted and may be fitted with
indicator lights. Recommended fixing heights are †Electrical Installations