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This is a question about (iii) of 514.13.1 of BS 7671:2022

haeyun kim

This is a question about (iii) of 514.13.1 of BS 7671:2022.

 

BS 7671:2022

514.13.1 A durable warning notice with the words 'Safety Electrical Connection - Do Not Remove' shall be securely fixed in a visible position at or near:

(i) the point of connection of every earthing conductor to an earth electrode, and

(ii) the point of connection of every bonding conductor to an extraneous-conductive-part, and

(iii) the main earthing terminal; where separate from main switchgear.

 

Q) I am wondering where does (iii) refer to, and why it is necessary to install the warning notices there?

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    we seem to have lost a reply from Graham, but I'll have a go.  the MET is any sort of marshalling block where the green and yellow wires come together that is not inside another box. although the regs don't make it very clear there is often more than one - perhaps in the basement of a block of flats, and then again inside each flat. this sort of thing. The warning is because taking the site off-earth without isolating the supply first may well allow all the earthed metalwork to drift to a  painful voltage.

    Mike.

  • 0 in reply to mapj1
    mapj1 said:
    we seem to have lost a reply from Graham

    Yes, not sure why?

    EDITED ... but it has reappeared, perhaps popped onto the moderation queue?

  • 0 in reply to mapj1

    And now the original post has re-appeared, I can link the two responses, which just happen to be complementary, by pointing out that the picture in the post from   clearly shows a more durable plastic notice, secured with screws ...

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  • 0 in reply to mapj1

    And now the original post has re-appeared, I can link the two responses, which just happen to be complementary, by pointing out that the picture in the post from   clearly shows a more durable plastic notice, secured with screws ...

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