The right thing is to change it to something smaller, what fuses do you have in the outbuilding? If they are say a 30A & 6A then again I wouldn't panic.
I hit the MEM breaker and it only turned off the supply to the stable, no the main house.
So thnakyou for helping me clear that up.
The only thing now is that 60A is before 100A View attachment 238277 is before View attachment 238278
It's semi likely anything bigger than 60A won't fit in the 60A carrier.
As to whether it's worth changing the 100A depends on the rating of the fuses in the outbuilding and the size of the SWA, it looks 3x10mm² ish to me, so realistically it may be of little use unless reduced to say 30A.
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