Discuss External Hot Tub Circuit on TN-C-S supply help advice please. in the Electrical Forum area at ElectriciansForums.net

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One particular link seems to go for TT'ing it :willy_nilly: But don't listen to me, cos I'm no expert on this subject.

Swimming pools: to bond or not to bond? - IET Electrical
 
I have writtern a few times regarding wiring hot tubs to PME as above 'Hot Tub Help'. I would never connect to a PME supply but the choice is yours. Things which need to be taken in to consideration being locality, ie is PME derived from overhead lines etc. Due to my location i always use TT and use earth tape as oppossed to earth rod as i find i can get a far better earth value than with rods. I often read how the supply neutral never goes open ?. i have seen several over the years both open and high resistance. Also i have come across neutral connection in hot tub being soldered very poorly again giving high resistance joints. How far away is the nearest spike point as this can make the difference in potential between true earth and PME earthing conductor. As i say the choice is yours but after installing a good number of hot tubs over the years and inspection being carried out by the NICEIC on there yearly inspection, they have never ever said to me, you should have used the PME earth ?.
 
As i say the choice is yours but after installing a good number of hot tubs over the years and inspection being carried out by the NICEIC on there yearly inspection, they have never ever said to me, you should have used the PME earth ?.
You were doing so well to convince everyone, until that last sentence. :ihih:
 
I can't remember exactly what it says, but in my opinion it needs to be clarified and made more than just a minor note (but then that can be said of a lot of 7671)

All I can say is that you cannot quote a current in kW, current is measured in Amps and power in Watts.

The water may well be heated via class one heaters, but those heaters won't be exposed to touch if it is a class two construction and the water itself is not a very good conductor

Hi Dave

Yes i agree it is a little vague, although it is dealt with in the various guidance documents.

Maybe i should of worded it better, 10 kW of connected load giving a resultant diverted neutral current.

Cheers
 

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