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Earthing or bonding ?

MrJack96

I see it a lot where the SWA isn’t serving as a protective conductor which I know it must still be earthed at one end due to being an exposed conductive part. My question is if multiple SWAs are all earthed at the supply end and meet again at a bit of equipment if we then connect all the SWAs together locally is this still classed as earthing even though they are already earthed at the supply? 

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  • 0

    MrJack96, I don't think that you have much to worry about in your electrical career because you ask some interesting questions.

    It cannot be earthing (CPCs) because those cables clearly do not provide a path back to earth. They appear to be an attempt at supplementary bonding, but presumably the exposed conductive parts are electrically continuous at the supply end.

    It looks a bit like plumber's bonding to me - a waste of copper.

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  • 0

    MrJack96, I don't think that you have much to worry about in your electrical career because you ask some interesting questions.

    It cannot be earthing (CPCs) because those cables clearly do not provide a path back to earth. They appear to be an attempt at supplementary bonding, but presumably the exposed conductive parts are electrically continuous at the supply end.

    It looks a bit like plumber's bonding to me - a waste of copper.

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  • 0 in reply to Chris Pearson
    Chris Pearson said:
    It cannot be earthing (CPCs) because those cables clearly do not provide a path back to earth.

    That is clearly not true, as current due to a fault in one of the cables will be carried back down another cable. The armour acts as "conductors in parallel".

    Chris Pearson said:
    presumably the exposed conductive parts are electrically continuous at the supply end.

    OK, but isn't that how the copper conductor is used when it is provided in parallel with armour?

  • 0 in reply to gkenyon

    I think that Graham and I are interpreting the OP differently.

    Granted that a fault in any of the SWA cables could travel both ways and by virtue of the wee bits of G/Y back down the other cables, but if a core is being used as the CPC and there is a fault beyond the termination of the armour, how does that current get into any of the armour?

  • 0 in reply to Chris Pearson

    Thank you Chris, I’m full of questions me Joy Thumbsup

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