Have a 63A RCD 5 Way box, with a 45A MCB, feds by 16mm2 tails, this in then feeding into a isolator via 10mm2 T&E, that then supplies the feed to a 6.5KW heater that is used prob once a month for 10 min intervals max.
Question: I have a spare 63A RCB + 20A MCB box, Can I take another feed...