BS 7430:2011+A1:2015

This standard BS 7430:2011+A1:2015 Code of practice for protective earthing of electrical installations is classified in these ICS categories:

• 13.260 Protection against electric shock. Live working
• 29.240.01 Power transmission and distribution networks in general

This British Standard primarily provides recommendations and guidance on meeting the requirements for the earthing of electrical installations, including:

1. protective earthing of low voltage installations to BS 7671:2008+A3:2015;

2. the interface between LV and HV substations of 11 000/400 V to BS EN 61936‑1:2010+A1:2014 within buildings; and

3. 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.