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HOT TUBS ANY VIEWS OR ISSUES?

John Peckham
I have been chatting to a mate of mine who is a very experienced sparks who does 10-15 hot tub installs a year. He TTs his supplies to hot tubs which are on PME supplies which is the majority of supplies in Essex other than the odd TT supply in country areas.


He does get called back to hot tubs that he has not carried out electrical installations because people climbing in and out of the hot tub where people have experienced "tingles" ie minor electric shocks. Sure enough these shocks are due to the hot tub being directly connected to the PME earth.


Currently (excuse the pun) BS 7671 701 and 702 do not cover hot tubs only the general rules in Parts 1-6.


Does anyone on the forum carry out hot tub installations and if so how do you do it? Has anyone been called to investigate "tingles"? Does anyone know of any more serious shocks or injuries relating to hot tubs or any other equipment connected to a a PME supply?


Thanks in anticipation.


JP


  • Former Community Member
    0 Former Community Member
    unless they are doing maintenance whilst wet and virtually naked, something I am very cautious about doing.


    Yes, it probably wouldn't look very good on your CRB check...........


    Regards


    BAD
  • 0
    Chris


    IET GN5 recommends a plastic insert in water supplies to outside taps that are use metal pipe work connected to a PME earth.


    I have put a plastic joint in my incoming water supply just after the stop valve. I did this as. I have an overhead PME supply that gets thrashed by the local trees as it runs through the village during stormy weather. I have no gas or oil supply. I did this to prevent diverted neutral currents setting light to the house if the PEN became open circuit.
  • 0
    The exposed conductive part is the water?
  • Former Community Member
    0 Former Community Member
    The exposed conductive part is the water?


    It depends how cold it is!


    Regards


    BAD & BED
  • 0
    perspicacious‍ stopped off at a house where I was installing a hot tub supply a couple of years ago, he even brought bacon sandwiches.


    For the record I used a TT earth for the detached garage, hot tub and all the stainless steel bollard lights around the hot tub and outdoor shower.


    I couldn’t TT the house as well, because there’s a DNO earth cable running out of the meter box set into the house wall to the DNO PME earth stake directly below the meter box and up against the house wall.
  • 0
    Just make sure your TT electrode is at least 2-3m away from any underground metallic pipe work connected to the PME earth.

    Wouldn't equipotentiality be better served by having the TT electrode at the same potential as the ground the tub was stood on ... whatever that might be.


    It seems a bit counterproductive to have the c.p.c. at a nice true earth potential if people are standing on ground that's at a higher potential due to a PME connected pipe below.


       - Andy.
  • 0
    From my point of view this is one of those "I do it, but do I really need to?" discussions.
  • 0
    Sparkingchip:
    perspicacious‍ stopped off at a house where I was installing a hot tub supply a couple of years ago, he even brought bacon sandwiches.


    For the record I used a TT earth for the detached garage, hot tub and all the stainless steel bollard lights around the hot tub and outdoor shower.


    I couldn’t TT the house as well, because there’s a DNO earth cable running out of the meter box set into the house wall to the DNO PME earth stake directly below the meter box and up against the house wall.


    Just for interest,

    if you have all these bits on a TT earth, do you TT them collectively or individually?


  • 0
    Collectively. Particularly the hot tub and the lights around it.
  • 0
    I did not get the Bod seal of approval,  but I didn't get told off.

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