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BS 7430:2026 has now published

gkenyon

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 

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  • Thanks Graham -- sound very interesting. Just a pity it costs so much more than even BS 7671....

       - Andy.

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  • Thanks Graham -- sound very interesting. Just a pity it costs so much more than even BS 7671....

       - Andy.

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  • in reply to AJJewsbury
    AJJewsbury said:
    Thanks Graham -- sound very interesting. Just a pity it costs so much more than even BS 7671....

    That is something for BSI to consider, or the government or the local government.

    Here in Lancashire, anyone with a public library card can access British Standards free to read on-line (but not download as a PDF) - so it's totally free! 

    I'm not sure how this works in other counties, but I've just checked Greater Manchester, who offer this through the Central Library (not online wherever you are).

    If this is something that's important to you as an individual, business owner, etc., please lobby your local government to get the appropriate access through the local library service.

    AJJewsbury said:
    it costs so much more than even BS 7671.

    Indeed ... yet the IET are criticised incessantly for 'turning the handle to make money'???

  • in reply to gkenyon

    I assume that standards are expensive because relatively few people require them.

    For example, all the type testing information in BS 60898 may be necessary for a manufacturer, but not an installer. There are tables of maximum permitted I2t, but a designer really needs the manufacturer's figures, which may be lower.

    British Standards used to be available through Hampshire Libraries, but not for 20(?) years. All they seem to have nowadays is things like ancestry.co.uk at libraries, but the level of access is so low as to be of little value.

    I have access to BSOL through the Open University. At one time, one could download a fairly standard .pdf, but now we require FileOpen software and there is a finite lifespan. Copying text and printing are not available.

    Another resource which Hampshire used to make available is the Oxford English Dictionary. That is not too expensive at £100/year.

    ETA: going back to the paper v digital debate: quite a lot of space is required for the 20 volume set and it is not cheap at £862.50. Nor does it get updated, so digital for me please.

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