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Ah I got ya. In my head I had mineral insulated which confused the hell outta me.    It’ll be MCB- fused rcd- thermostat- heat mat then.   

Are you referring to the cable type?

Apologies. Title should say “rcd” with fused spur.... think you’ll have guessed what I meant 

Hi all fitting some underfloor heating and have easy access to consumer unit.    what’s peoples thoughts on connecting thermostat/ heating cable directly to an rcbo as opposed to using an mcb with a switched fused spur for over current protection?