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Adding a bonding conductor to an existing main earth terminal

Electron666

Hi do you need to isolate the supply to a commercial building to connect a 16mm2 bonding conductor to the MET in relation to BS 7671 or HSE?

It isn't something I can find explicit guidance on.

The MET is at the intake and separate to the main LV board.

It is easily accessible without coming into contact with L&N conductors connected to the main LV board.

The earthing system is either TN-S or TN-C-S.

Isolating the supply is possible if required but would be costly, require multiple companies attending out of hours and would need to be planned in well in advance due to it being a refrigerated / food storage facility.

I note all these reasons are inconvenience related which is secondary to health and safety. Therefore, I'm only asking if there is a method that is commonly used such as standing on rubber mats or wearing rated gloves etc that is considered safe and proportionate to the to the small task being carried out.

Thanks

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  • 0 in reply to aligarjon

    According to national-claims.co.uk/ the cost of an arm and leg (complete set of parts) would be 

    One leg (above knee) £127,930 – £167,760

    One arm (at shoulder) Not less than £167,380

    I'd expect that it's more in the land of the free and easy lawsuits Grimacing.

    so ~ a third of a million pounds.

    Worth a few minutes discussion on a forum perhaps Smiley. And some PPE, just like the DNOs use when checking for diverted Neutrals Neutral Current Diversion Demonstration.

    All that's happening here is [essentially] the installation of that Neutral Current Diversion path!

    Cloud lightning

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