Applies to electrical installations such as those of:a)residential premisesb)commercial premisesc)public premisesd)industrial premisese)agricultural and horticultural premises f)prefabricated buildingsg)caravans, caravan sites and similar sites h)construction sites, exhibitions, fairs and other temporaryinstallations.i)marinas and pleasure craftCovers:a)circuits supplied at nominal voltages up to and including 1000 Va.c. or 1500 V d.c.b)circuits, other than the internal wiring of apparatus, operatingat voltages exceeding 1000 V and derived from an installationhaving a voltage not exceeding 1 000 V a.c., e.g. dischargelighting, electrostatic precipitatorsc)any wiring not specifically covered by the standards forappliancesd)all consumer installations external to buildings;e)fixed wiring for telecommunication, signalling, control and thelike (excluding internal wiring of apparatus)f)the extension or alteration of the installation and also parts ofthe existing installation affected by the extension or alteration.Does not apply to:a)electric traction equipmentb)electrical equipment of motor vehiclesc)electrical installations on board shipsd)electrical installations in aircrafte)public street-lighting installationsf)installations in minesg)radio interference suppression equipment, except in so far as itaffects the installation's safetyh)electric fencesi)lightning protection of buildings.This standard is not intended to apply to:-systems for distribution of energy to the public, or-power generation and transmission for such systems.Electrical equipment is dealt with only as far as its selection and application in the installation are concerned.This applies also to assemblies of electrical equipment complying with the relevant standards.An assessment is made of the following characteristics of the installation in accordance with the clauses indicated:-the purposes for which the installation is intended to be used, its general structure and its supplies (clause 31);-the external influences to which it is to be exposed (IEC 60364-5-51);-the compatibility of its equipment (clause 33);-its maintainability (clause 34).Those characteristics shall be taken into account in the choice of methods of protection for safety (see IEC 60364-4-41 to IEC 60364-4-44) and the selection and erection of equipment (see IEC 60364-5-51 to IEC 60364-5-55).