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I have a question.How do I get the Ze for my shed ? do I get it at the intake to the small consumer unit inside my shed then do the usuall Zs= Ze + (R1+R2)The source of supply is from a socket in the garden that is direct from the house CU RCD protected. or would I have to use the Ze from the house intake position. My shed is stand alone with a light circuit 6amp mcb and two radial circuits 20amp mcb all protected by RCD. another problem I have is if the shed CU trips the house Cu trips too. both protected by 30ma RCDs the garden sockets are 32amp mcb.