Don't panic, it's not a problem, and doesn't need changing (provided it, and connections/wiring to it, are satisfactory).JohnW2........... I think this is going from ok, to not so ok & now to worse! There is an earthing 'rod' in the corner (nearest the house) in our attached garage/workshop. I suspect you are going to tell me this is not good................but it does have a 'hat' on the top,......if that helps!
Without wishing to confuse you with technicalities, the reason I asked was that, if your earthing system is a local earth rod (what electricians call a 'TT' system), whilst an 'all RCBO' CU would be fine, there would be a potential problem with a 'not quite all' RCBO system.
You will probably find fairly polarised views about 'all RCBO' CUs. The one (probably only main) advantage they offer is that a fault causing a trip on one circuit should not affect any other circuit. However, there are also 'downsides' For example, RCBOs are much more expensive than standard breakers (MCBs). Also, they combine the functions of an MCB and an RCD in one unit but (except in very expensive ones) generally do not indicate which of those functions has caused a trip - which can frustrate fault-finding. Your electrician will undoubtedly have a view.
Kind Regards, John
