ABSTRACT
Electricity is supplied to a building by a supply authority; in the United Kingdom this is an Area Electricity Board, while in other countries it may be an Electricity Supply Company or public body. The supply is provided by a cable brought from outside into a suitable point in the building, which is referred to as the main intake, and from this the electricity has to be distributed to all outlets which use it. The incoming cable may be a 120 or 150 mm2 paper insulated cable and the current flowing along it must be divided between a number of smaller cables to be taken to the various final destinations throughout the building. This division is the function of the distributing system.
