On 13/11/2018 19:17, Roger Hayter wrote:
Pat Pending wrote:

Just put an electricity supply in to a shed at the bottom of the garden
- 4mm armoured cable to a separate CU in the shed. We have TT earthing,
so didn't use the cable earth and put in a 5/8" x 1m earth rod outside.
Measured the earth loop impedance, and I have 320 ohms - far too high
isn't it? Any suggestions?

Pardon my ignorance, but is there any reason you can't connect the house
TT earth to the shed via the cable? By all means use the new stake in
parallel. An RCD at on or another end of the cable is probably needed
either way.


What you suggest sounds logical, but I was told not to use the house
earth but disconnect it and put in a separate TT system. Not sure why,
what do the experts think?