Since our garden electrics are also fed from the same side of the split load unit it means that anything that goes awry in the garden and trips the RCD also stops the garage doors working which can be a bit of a nuisance (especially since the CU is in one of the garages!). It's not a disaster because there's a alternative access to the garage but it would be good if we could split the garage doors off the RCD protected circuits - or at least split them off the same circuit as the garden, pond, etc.
So what are the allowed/correct ways of doing this?
Can I used a dedicated, non-RCD protected circuit for the garage doors? The existing sockets are mounted on the rafters adjacent to the door opening gear so are hardly likely to be used for 'portable equipment out of doors'. Is it OK to have these three dedicated sockets non-RCD protected even though they're in a garage? This is the cheapest way to fix the problem, I have spare circuits on the non-RCD side of the CU.
Similar to the above I could dedicate a circuit to the garage door openers and not have them on sockets at all but I suspect that this then requires a double pole switch for each to allow it to be isolated. A bit more expensive but not much.
The most expensive solution is to dedicate an RCBO (combined RCD and MCB in other words) to either the garden/pond or the garage doors and add this to the CU on the non-RCD side. I suppose it's the ideal solution but will cost thirty or forty pounds. It is also the simplest solution in that it only involves moving some wires in the CU.
.... and yes, I know it's probably part P'able.