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RCBO shared between TN-S and TT earthing systems.

justinneedham
Have come across ~ 20 year old installation where RCBO in TN-S household CU acts both as additional protection for local sockets circuit, and fault protection for a remote garage which is spurred then TT'ed. 

I can't on the face of it see any reason (other than inconvenience in event of a fault), why not. (OK, BBB.. 531.3.5.3.1). 

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    well, electrically it is OK, in the sense that both ring and garage are protected against L-CPC and L- terra-firma faults.

    I think ideally as far as the regs, you'd have a dedicated RCD for the garage, but realistically they would race.
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    well, electrically it is OK, in the sense that both ring and garage are protected against L-CPC and L- terra-firma faults.

    I think ideally as far as the regs, you'd have a dedicated RCD for the garage, but realistically they would race.
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