2.4.1 -  Introductions

Before planning and carrying out an electrical installation, thought must be given to factors affecting its effective operation, but some basic information will be needed concerning the supply system. The Electricity Supply Company will provide information concerning the number of phases, phase sequence and voltage of the supply. They will also give information as to the prospective short circuit current {3.7.2}. Details of the supply protection and the external earth fault loop impedance {5.3) for the site concerned will be given.

The installation designer will also need to consider other matters, such as the purpose of the installation, the external influences which may affect it {2.4.3}, the compatibility of its equipment {2.4.4} and its maintainability {2.4.5}.