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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


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  • 0
    I can see the risk. I guess one solution is not to get in while it is full of water.. and another  is not to step out directly onto the ground but rather via something that adds a few k ohms in series, like decking, plastic steps or even to abseil in and be winched out using a synthetic rope. Maybe not the last ones.


    However,  having said that, unless we can persuade folk to bathe in transformer oil, like the car charger, a local TT island that connects the exposed potentials to  whatever the surface potential is nearby seems to be the obvious electrical fix. As a non hot tub user, who does quite  bit with earth electrodes,  I think your mate is doing the sensible thing. It may be tricky if other items at house earth potential are in reach such as outside taps.

    M.
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  • 0
    I can see the risk. I guess one solution is not to get in while it is full of water.. and another  is not to step out directly onto the ground but rather via something that adds a few k ohms in series, like decking, plastic steps or even to abseil in and be winched out using a synthetic rope. Maybe not the last ones.


    However,  having said that, unless we can persuade folk to bathe in transformer oil, like the car charger, a local TT island that connects the exposed potentials to  whatever the surface potential is nearby seems to be the obvious electrical fix. As a non hot tub user, who does quite  bit with earth electrodes,  I think your mate is doing the sensible thing. It may be tricky if other items at house earth potential are in reach such as outside taps.

    M.
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