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Changeover mess

lyledunn


 An assembly to be proud of!  The wiring down to the meter is just a bit of HO7RNF with the outer sheath stripped back. The door pulls open with a simple thumb-turn. 
It is an automatic start up which kicks in when the load exceeds some pre-set value. It disconnects the mains to a business venture at the rear of a farm. Of course there is a delay and so tills, computers, cctv etc are all interrupted. 
Installed in the attached garage of the dwelling. Speculating that this was moonlighting by someone who messes with gen sets but has never touch base with 7671!


Parents

  • Some notes I made about this:

    1. It's an assembly of equipment - pretty much by definition a 'switchgear and controlgear assembly'. BS 7671 requires these to be constructed to appropriate standards (Regulation 113.1), which in this case would be BS EN 61439-series.

    2. ESQCR (Britain and NI versions) Regulation 21 has provisions for switched alternative supplies. One of those is that BS 7671 applies ... and an issue for both ESQCR and BS 7671 conformity is whether the contactors provide isolation.

    3. Whilst (arguably) not addressed as yet in ESQCR Regulation 21 and Distribution Code Schedule 1 documents "Have to"), in essence this is an importation limitation scheme by any other name, and should (going forward for new installations) conform to ENA EREC G100.

Reply

  • Some notes I made about this:

    1. It's an assembly of equipment - pretty much by definition a 'switchgear and controlgear assembly'. BS 7671 requires these to be constructed to appropriate standards (Regulation 113.1), which in this case would be BS EN 61439-series.

    2. ESQCR (Britain and NI versions) Regulation 21 has provisions for switched alternative supplies. One of those is that BS 7671 applies ... and an issue for both ESQCR and BS 7671 conformity is whether the contactors provide isolation.

    3. Whilst (arguably) not addressed as yet in ESQCR Regulation 21 and Distribution Code Schedule 1 documents "Have to"), in essence this is an importation limitation scheme by any other name, and should (going forward for new installations) conform to ENA EREC G100.

Children
  • in reply to gkenyon

    Yes, get you on the first two GK but never really considered the G100 perspective. I thought the G100 was an export limitation for generators in parallel with the DNO. 

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