Garage supply

[paul b b]

Test your house rcd an see what it trips at. you could also tt the shed if you like. I know steps would lol

how about running some twin through house to an outside wall where the shed is located, then twin into an ip rated box and swa from there? Depending in run length and if its no in insulation you may getaway with using 2.5

Good luck and post pics on completion

 

[sparkytim]

You will not get discrimination between two standard RCDs on the same circuit unless the upstream one is time delayed (S type)