7.5KW shower with 6mm cable

[nickdnew]

Garro do a changeover device in its own enclosure and you can set priority to either side, might be worth a look

Thanks, this is the same one as the link sent to me by Zerax. I'm guessing that the same principle but not automatic, would be to use a 40 or 32 amp normally closed contactor. I can find a 40a NO contactor but not a 40a or 32a NC contactor.

 

[nickdnew]

Found one, but not much difference in price.

https://www.cef.co.uk/catalogue/pro...W_gFVVAuRhOAe947-DQaAkXSEALw_wcB&gclsrc=aw.ds

 

[nickdnew]

Ok, found a cheaper 2 pole one at £35. Just wondering if it would pass an EICR as you would need a 1.5mm cable running back from the isolating switch for the shower to the consumer unit wired into the contactor.