If you have a supply to a shed/garage, and the circuit is 30mA RCD protected, there is no need for another RCD in the shed/garage CU.
However, if a fault happens and causes the RCD in the main CU to trip, this can become a nuisance having to go indoors and reset it.
Would the answer be to, isolate the earth from the main CU in the house, and instead, run an earth from the shed/garage RCD protected CU, to an earth rod in the ground outside? Would this prevent the main RCD tripping?
This is not a current problem. Just one of those idle thoughts that pop into your head when you are relaxing.
However, if a fault happens and causes the RCD in the main CU to trip, this can become a nuisance having to go indoors and reset it.
Would the answer be to, isolate the earth from the main CU in the house, and instead, run an earth from the shed/garage RCD protected CU, to an earth rod in the ground outside? Would this prevent the main RCD tripping?
This is not a current problem. Just one of those idle thoughts that pop into your head when you are relaxing.