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Question about hot tubs

Discuss Question about hot tubs in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

Also, by TTing the remote installation it will likely retain RCD protection if DNO experiences the dreaded floating N fault. All very unlikely, I know.
 
Devonchris said:
Maybe because IET guidance says that when outdoors you should?

(Extract from wiring matters)
All electrical work should comply with BS 7671. There are no specific requirements for electrical installations associated with hot tubs in BS 7671. However, where a hot tub is located outdoors in the open air, for example a garden, IET Guidance Note 7 Special Locations recommends that the requirements of Section 702 (swimming pools and other basins) should be applied. The requirements for swimming pools are given in Section 702 of BS 7671:2008+A3:2015. IET Guidance Note 7 also sets out the risks.

But it's only guidance and down to risk assessment at design stage by whoever is designing and installing I suppose.

My understand, for what its worth as it was imparted a long time ago, is that any metallic parts of the installation would be earthed. The extraneous conductor in this case would be the ground especially when wet and with bare feet.
Click to expand...

I understand that it is classed as a swimming pool. That is obvious. But BS7671 says no such thing about TT’ing a swimming pool blindly. If there is nothing to earth or bond then what is the risk of electric shock?

And are you seriously saying that we need to bond the ground? Can you explain to me how we would go about this? I will get my popcorn.
 
essex said:
Why anyone would TT a hot tub with no extraneous metallic parts available to touch is beyond me.
Click to expand...
Possibility of step voltages on wet ground?
 
Not hot tub bod meself, but read suggestions here (with PME) of using that earthing facility, and local rod. These hot tub parties can get pretty raunchy apparently, lots of water being splashed around, & bodies everywhere.
 
essex said:
And are you seriously saying that we need to bond the ground? Can you explain to me how we would go about this? I will get my popcorn.
Click to expand...

If the extraneous metal part is in the ground then its acting as a conductor between it and the ground. In this case just put a clamp on. Where you are in direct contact with the ground put a rod in. The effect is the same, you are ensuring that they are all at the same potential.
 
essex said:
Will an RCD work without a neutral?
Click to expand...
The local test button no, but the safety function yes. Also, with TT the rising N does not mean CPC has to rise. Any fault current that did still flow will travel via L through the RCD etc and return to transformer via rod or Us. So the RCD detects imbalance in L to N and trips in the usual way, hopefully :) .
 
Devonchris said:
If the extraneous metal part is in the ground then its acting as a conductor between it and the ground. In this case just put a clamp on. Where you are in direct contact with the ground put a rod in. The effect is the same, you are ensuring that they are all at the same potential.
Click to expand...

How can you make non-conductive materials the same potential? Hot tubs are plastic. The frame is plastic. The pipework is plastic.

Can someone please explain why we would TT PLASTIC
 
essex said:
How can you make non-conductive materials the same potential? Hot tubs are plastic. The frame is plastic. The pipework is plastic.

Can someone please explain why we would TT PLASTIC
Click to expand...
and don'tforget to put a rod in the water. :mad:
 
Wilko said:
Ha ha, good question. If the installation is double insulated then I guess it makes no odds.
Click to expand...

Exactly, which almost all hot tubs are. The issue only arises when there is other conductive things around such as steel conduit an outside tap. Then we would need to look at possibly changing things.

I suppose my point is every installation will be different and that is why blanket decisions like TT it makes us lazy sparks.
 

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