New MCB Board & the garage

[walec]

I am now in a postion to apply to join a relevant body for Part P approval.
The CU in my house needs replacing (actually there are currently two as extensions have been added over the years) I will put in a new RCD split board but
I am unsure about the feed to the garage which is away from the house. If I supply the garage from the house do I then put an RCD in the CU in the garage, or do I go directly to a switch in the garage and then go to the CU.
I could put a seperate RCD switch in as there are already two sets of tails.
Just want to know the best way which conforms to 17th

Thanks

 

[Wotsit]

What are is the current earthing arrangement in the house? Do you have any extraneous conductive parts in the garage?

If the supply is PME and no extraneous conductive parts i would export the eathing arrangement to the garage, via SWA with non RCD protected at the house end and put a new CU in the garage with RCD.

If PME with extraneous conductive parts i would consider putting the garage if detached on a TT. Or Export PME and Bond Back to house MET

 

[walec]

Thanks for your advice, It is PME with extraneous conductive parts in the garage, I will put putting the garage on a TT.
what I am not clear on is the supply to the garage, my understanding is the SWA must be RCD protected, so if
I put it on an RCD in the house what do I do in the garage? I believe that CU also should be RCD protected.

 

[Wotsit]

Have a look at this thread

 

[walec]

Got it thanks