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Spa, 13A Socket & TT Earth

Tolly

When installing the likes of 32A supply for an outdoor spa, a certain electrical contractors association recommends installing a rotary switch that provides a TT earth for the spa via an earth electrode wired directly into the switch (so divorcing the spa from an installations TN- supply).

An outdoor 2.8kW spa is to be supplied by an IP66 13A socket (from its own type A 16A RCBO) (the spa comes with a supply lead that incorporates a 13A plug and 10mA PRCD moulded into the lead). So, as with a rotary switch being TT earthed, do you see a problem with the socket being TT earthed also (via a Condudisc) (Installation has TN-S supply, but worry is DNO can convert it to TN-C-S)?

Thanks

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  • 0

    A garden socket outside on a TT earth is no worse than a socket in a shed on a TT earth, and can be the best solution to outdoor power without tingles.

    BUT avoid things that export the PME earth, like metal outside taps or outside lights if within reach, Given the application someone will not plug in an extension lead and bring the TT earth into the house, but there may be things that accidentally bring the PME earth from in inside the house to the outside, and these need to be sensibly out of simultaneous reach of things in good contact with the ground, which the TT earthed kit clearly will be.

    Mike

  • 0 in reply to mapj1
    mapj1 said:
    A garden socket outside on a TT earth is no worse than a socket in a shed on a TT earth, and can be the best solution to outdoor power without tingles.

    BUT ... if the shed is not far away from the house, and circuits are run from both, so that there are simultaneously-accessible exposed conductive-parts from both earthing arrangements, BS 7671 is not guaranteed to provide protection against electric shock. Regulation 411.3.1.1.

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  • 0 in reply to mapj1
    mapj1 said:
    A garden socket outside on a TT earth is no worse than a socket in a shed on a TT earth, and can be the best solution to outdoor power without tingles.

    BUT ... if the shed is not far away from the house, and circuits are run from both, so that there are simultaneously-accessible exposed conductive-parts from both earthing arrangements, BS 7671 is not guaranteed to provide protection against electric shock. Regulation 411.3.1.1.

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