DHW dual stat

[Hairymelon]

Thanks for your helpful comments johnw2. It just seems wrong to me. In my work as a plumbing and heating operative I get called to cylinders that have become soaked due to plumbing faults and the thought that that control could be soaked and live with no earth worries me but I am not an electrician and clearly am worrying unnecessarily

 

[JohnW2]

Thanks for your helpful comments johnw2. It just seems wrong to me. In my work as a plumbing and heating operative I get called to cylinders that have become soaked due to plumbing faults and the thought that that control could be soaked and live with no earth worries me but I am not an electrician and clearly am worrying unnecessarily

I understand your concerns. However, you have to consider what there is that you could 'earth'.

The parts which are touchable when in service are plastic, and therefore cannot be earthed. The only risk I can think of is that water ingress could result in the copper pipes/bulbs become live. However, they are not touchable when in-service, so the only risk then would be that they could touch the metal tubes and thereby possibly make the whole cylinder live. However, in practice, the cylinder would almost inevitably be earthed (e.g. by the immersion element, if not also boiler, pumps, valves etc.), so any such contact been 'live' bulbs and their tubes would trip one of the protective devices in the electrical installation.

I suppose the bottom line is that the absence of a provision for earthing the bulbs/tubes cannot really be 'accidental' - so the manufacturers presumably are satisfied that the product is safe, as supplied.

Kind Regards, John