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SWA Earthing

Former Community Member
Former Community Member

Hi All, 

I'm currently Installing Cabling for a Hot Tub Instead of Running SWA all the way through the house, I have used 6mm T+E 10m to run from Consumer unit through the ceiling of the house. 

Just before it enters outside I have then used a Junction box to connect this with SWA. As the SWA only starts 10m away from the Consumer unit will I need to run a separate earth cable for the armour back to source (Consumer unit)?

Thanks in advance.

 

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    whjohnson: 
     

    The general consensus seems to be that if the supply and earthing characteristics are PME, then you earth the armour back to the cu but do not use it as an earth for the hot tub end. The hot tub end should be TT'd with a rod and provided with RCD protection as required.

    But note that  simultaneously-accessible exposed-conductive-parts cannot be connected to different earthing systems. Regulation 411.3.1.1.

    If this is a small-curtilage property, that could be an issue because of extension leads. Even if you check everything “fixed” is OK when you leave the installation, the use of extension leads must not be possible - remember the users of a domestic installation are usually not skilled or instructed persons (electrically) as defined in BS 7671.

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  • 0

    whjohnson: 
     

    The general consensus seems to be that if the supply and earthing characteristics are PME, then you earth the armour back to the cu but do not use it as an earth for the hot tub end. The hot tub end should be TT'd with a rod and provided with RCD protection as required.

    But note that  simultaneously-accessible exposed-conductive-parts cannot be connected to different earthing systems. Regulation 411.3.1.1.

    If this is a small-curtilage property, that could be an issue because of extension leads. Even if you check everything “fixed” is OK when you leave the installation, the use of extension leads must not be possible - remember the users of a domestic installation are usually not skilled or instructed persons (electrically) as defined in BS 7671.

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