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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

    Thank you for the great responses. Here is another example. 3 phase feeds local isolator using swa as the cpc. However as you can see flyleads have been added to join all the SWAs together even though they are earthed at the Supply. I’m aware this may not fall under BS761 but wouldn’t this be supplementary? 

  • 0 in reply to MrJack96

    No you say yourself they are the circuit CPC as they are Earthed both ends. Even if there were another G/Y they all together would form the CPC. Supplementary bonding joins things that are not part of the electrical installation to the installation for example in a bathroom to the pipes. In large installations it may sometimes be used to reduce Ze, for example using structural steelwork, but in reality this becomes part of the CPC.

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  • 0 in reply to MrJack96

    No you say yourself they are the circuit CPC as they are Earthed both ends. Even if there were another G/Y they all together would form the CPC. Supplementary bonding joins things that are not part of the electrical installation to the installation for example in a bathroom to the pipes. In large installations it may sometimes be used to reduce Ze, for example using structural steelwork, but in reality this becomes part of the CPC.

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