BS 7430:2016 Protective earthing of electrical installations. Code of practice is now available from BSI.
Quite a few changes in the guidance provided in the standard since the previous version, BS 7430:2011+A1:2015. New content includes:
- New Guidance on earthing of generating sets, including the use of stand-alone unearthed generating sets, and required earth electrode resistance for generating sets operating as a switched alternative to another source.
- Guidance on separation of earthing systems, and the criteria to be met.
- Foundation earthing.
- Better alignment with BS 6701 and BS EN 50174-3 for conductive ICT services and hot sites.
- Updated guidance on measurement of earth electrode resistance.
This version of the standard aligns with BS 7671:2026, and duplication/overlap between the two standards has been kept to a minimum.
The standard is referenced by BS 7671, and by a number of IET guidance publications on electrical installations.
The table of contents is reproduced on the preview tab here: https://knowledge.bsigroup.com/products/protective-earthing-of-electrical-installations-code-of-practice