In message , Matt Pearson
writes
Do you think having a 2nd earthing source is good practice? My query was do
you feed house supply cable to earth rod or to the shed csu first and then
hook the earth rod into the shed csu.


I though it was good practice to have the shed earth separate from the
house earth (if there was an earth at the shed end) The supply goes to
the CU not the earth rod.

My shed/GH supply is fed with 2 core SWA. The steel sheath of the SWA is
earthed at the house end. It is not connected to earth at all at the
shed end. The same would apply if the cable was had an earth as well.

The SWA cable terminates at the shed end in a small plastic CU (if you
used a metal CU it would need an isolating gland). The CU earth terminal
is then connected to the earth rod.

Shed CU has a 30mA RCD protecting all the circuits.

At the house end the supply is connected to a Switch fuse unit (Wylex
make them) into the supply via a Henley block.

Did you work out the cable size needed?
--
Chris French, Leeds