RCD protection for existing heater circuits


Customer wants existing storage heater circuits moved over to on-peak. He is having some fancy eco heaters that i am not fitting installed by another party and they, as far he knows, only require an on-peak supply.  The existing fuse box does not have rcd protection. If i change it over will it need RCD protection.( i don't think it does as i am not changing any circuit wiring) i appreciate it would be a C3 on a report as it is because of cable depths.  The cables obviously are already in place with 20amp switches on.




  • If you're just moving the tails from one Henley block to another, I'd say it's OK to leave the final circuits without RCD protection. Certainly point out the issue to the customer and suggest that this would be a good opportunity for an upgrade, some plain words in the 'comments on the existing installation' box if they don't fancy adding an RCD.

    If moving the final circuit wiring from an MCB/fuse in one CU to another ... I'm less comfortable, but I think would reach the same conclusion as still none of your new work itself requires RCD protection (presuming the CU isn't in a bathroom or anything odd like that).

        - Andy.

  • Thanks Andy.  Thinking about it i will ask the customer to ask the installers if the manufacturers instructions require one as well as i don't know what is being fitted.


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