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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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    The armouring of any S.W.A. cable can't be an exposed-conductive-part cos it ain't exposed to touch.

    I feel the the wording of the definition sometimes isn't always helpful. If a part can be made hazardous live by a fault, can't be directly touched because of something around it, but that something doesn't provide sufficient insulation to make the situation safe, then it seems to me there is a problem.  Cable sheaths are generally not considered to be adequate for insulation. It's a similar situation with flush steel back boxes surrounded by plasterwork (and 'live wall' consequences).  I suppose you could consider the SWA and plastic sheath, or back box and plasterwork, together as one exposed-conductive-part to fit the definition, but that's hardly intuitively obvious.

       - Andy.

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    The armouring of any S.W.A. cable can't be an exposed-conductive-part cos it ain't exposed to touch.

    I feel the the wording of the definition sometimes isn't always helpful. If a part can be made hazardous live by a fault, can't be directly touched because of something around it, but that something doesn't provide sufficient insulation to make the situation safe, then it seems to me there is a problem.  Cable sheaths are generally not considered to be adequate for insulation. It's a similar situation with flush steel back boxes surrounded by plasterwork (and 'live wall' consequences).  I suppose you could consider the SWA and plastic sheath, or back box and plasterwork, together as one exposed-conductive-part to fit the definition, but that's hardly intuitively obvious.

       - Andy.

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