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Which version of BS 7671 should I use?

AJJewsbury
I'm confused. Let's, for example, say I'm doing an upmarket domestic (complete with PV and EV) that's intended to be rented out and the work will be overseen by building control.


As I see it:
  • BS 7671 says I should use the latest version (subject to any transition periods when new versions are published) - so currently BS 7671:2018+A1:2020 (plus possibly a Corrigendum or so).

  • The ESQCR (as amended) demands that (because I have on-site generation operating in parallel with the mains) I comply with "British Standard Requirements" which it defines as BS 7671:2008 (17th Ed) (unamended).

  • AD P suggests that if I want a nice "deemed to comply" solution that BC will accept, I need to work to BS 7671:2008 incorporating Amendment No 1:2011.

  • As the property is going to be rented, the new "The Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020" will have to be complied with, and that requires compliance with BS 7671:2018 (unamended).


So do I have to read four different versions of the Wiring Regs at once and try and come up with a design that simultaneously satisfies all four? (which I'm not sure would always be possible) and even if I did that which version should the certificate say it complies with?


  - Andy.
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    AJJewsbury:

    So do I have to read four different versions of the Wiring Regs at once and try and come up with a design that simultaneously satisfies all four?


    No. If you are inspecting a tenanted property, you do it against BS 7671:2018. Amendments are not mentioned, so use the current one in line with normal practice.


    If ESQCR applies, you install in compliance with BS 7671:2008 as well as whichever version was in force at the design stage - your EIC or MWC will require the latter.


    Ignore the AD P - it is only guidance.


    So in fact, as ever, the version depends upon whether you are inspecting or installing.


    Thank you, Mike, for the explanation about "ambulatory legislation". I doubt that even a judge of the calibre of the late Lord Denning would have been able to reinterpret such unambiguous legislation and I can find no obvious relevant case law. There might, however, be a general defence in such matters - no less safe and so on.


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    AJJewsbury:

    So do I have to read four different versions of the Wiring Regs at once and try and come up with a design that simultaneously satisfies all four?


    No. If you are inspecting a tenanted property, you do it against BS 7671:2018. Amendments are not mentioned, so use the current one in line with normal practice.


    If ESQCR applies, you install in compliance with BS 7671:2008 as well as whichever version was in force at the design stage - your EIC or MWC will require the latter.


    Ignore the AD P - it is only guidance.


    So in fact, as ever, the version depends upon whether you are inspecting or installing.


    Thank you, Mike, for the explanation about "ambulatory legislation". I doubt that even a judge of the calibre of the late Lord Denning would have been able to reinterpret such unambiguous legislation and I can find no obvious relevant case law. There might, however, be a general defence in such matters - no less safe and so on.


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