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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
    As I understand it apart from some of the ones that plug in on a 13A plug top they are all Class 1 requiring an earth connection. The heaters and pumps are Class 1.


    Mike


    Yes that is the problem the metallic parts connected to the CPC are in contact with the water which is at the potential of the supply neutral. The supply neutral voltage will vary depending on the load on the network and load balance. The problem of "tingles" arises when in contact with the water and simultaneous contact with the general mass of earth. Add to the issue with immersion in water of substantial part of the body and you may be getting in to the dangerous areas of the IEC time current shock curves.
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  • 0
    As I understand it apart from some of the ones that plug in on a 13A plug top they are all Class 1 requiring an earth connection. The heaters and pumps are Class 1.


    Mike


    Yes that is the problem the metallic parts connected to the CPC are in contact with the water which is at the potential of the supply neutral. The supply neutral voltage will vary depending on the load on the network and load balance. The problem of "tingles" arises when in contact with the water and simultaneous contact with the general mass of earth. Add to the issue with immersion in water of substantial part of the body and you may be getting in to the dangerous areas of the IEC time current shock curves.
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