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Hello. Could do with some advice please! Have just had two timber buildings added close to house. Initially planned on using spare way on RCD side of CU with 20A MCB to feed new 45A 2-way 30mA RCD unit via 4m of 4mm SWA T+E, and from 16A MCB there max 10m of 2.5 SWA T+E into second building...