ARW wrote:
On 13/11/2018 18:36, Fredxx wrote:
On 13/11/2018 17:22, 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?

Max 200 and ideally less than 100 ohms.

More earth rods and/or longer earth rods if you are able to drive them
into the soil.

This time of the year its wet and more imperative to aim for 100 ohms
for times when the ground is dry.

+1

I did a site supply this the summer. Just at the end of the 4 weeks
without rain. Could we hell get the Ze below 220 ohms. Last week I added
an extra 110V supply and it had ****ed it down all week. Now down to 30
ohms and the apprentice lost a work boot in the mud.

Is it permissible to bond the local earth to neutral in this situation?