OldPeeBee
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I am about to change a DB in a stable block to TT; as at the moment it has an exported earth from the main house (TNC-S). The DB is a split load board with a 30mA RCD for the power side; main switch is standard 100A. Should I change the main switch to a 100mA RCD or utilise the existing RCD as a main switch/RCD for all circuits?