Contents
Scope
Normative references
Terms and definitions
Earthing principles
HV/LV interface
Low voltage installations
Generators
Special installations
Earth electrode systems
Inspection and testing of the earthing system
1 Scope
This British Standard primarily provides recommendations and guidance on
meeting the requirements for the earthing of electrical installations, including:
a) protective earthing of low voltage installations to BS 7671:2008+A1;
b) the interface between LV and HV substations of 11 000/400 V to
BS EN IEC 61936-1:2011 within buildings; and
c) protective earthing and changeover switch arrangements for generators
supplying low voltage installations.
The earthing of a system or installation is generally provided for reasons of
safety.
This British Standard applies only to land-based installations in and around
buildings. It does not apply to:
1) ships, aircraft or offshore installations;
2) earthing of medical equipment [see BS EN 60601 (all parts)];
3) special problems encountered with solid state electronic components;
4) equipment sensitive to static electricity;
5) requirements for functional earthing;
6) earthing of overhead lines between electrical installations; or
7) the internal earthing of equipment.
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