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PE advice by Napit (hot tubs)

ebee

There is an article in PE and I have just received it via email.

I am disappointed that the article seems to suggest that it contains all you need to know yet no mention is made of earthing systems

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    Just to be clear regarding this, yes, you're unlikely to get a voltage greater than 50 V to “Earth" (well, the other end of the earth electrode resistance sphere of influence) … but I think that Supplementary Local Equipotential Bonding is far greater an issue.

    Basically, your touch current can exceed Ra … for a number of reasons (as I explained in the previous post, this completely negates the earth electrode resistance itself from the loop) … and if you've selected a bonding resistance (permitted by BS 7671) in excess of 1K, you may have a touch current that would be OK in dry conditions, but not wet or submerged as we are discussing here.

    Some of this is perhaps crossing out of BS 7671 into product standards for hot tubs themselves, but does need to be considered somewhere along the line.

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  • 0

    Just to be clear regarding this, yes, you're unlikely to get a voltage greater than 50 V to “Earth" (well, the other end of the earth electrode resistance sphere of influence) … but I think that Supplementary Local Equipotential Bonding is far greater an issue.

    Basically, your touch current can exceed Ra … for a number of reasons (as I explained in the previous post, this completely negates the earth electrode resistance itself from the loop) … and if you've selected a bonding resistance (permitted by BS 7671) in excess of 1K, you may have a touch current that would be OK in dry conditions, but not wet or submerged as we are discussing here.

    Some of this is perhaps crossing out of BS 7671 into product standards for hot tubs themselves, but does need to be considered somewhere along the line.

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