Andy Wade wrote:
Invisible Man wrote:

I have asked my supplier whether they will convert to TNC-S and am
awaiting a reply. Can anyone comment on my chances of getting the
supply changed over? EDF Energy area but my supplier is Atlantic
Electricity and Gas.

Fairly likely, unless you're in the back of beyond. It might help to
ask for 'PME conversion' rather than TNC-S, although it's exactly the
same thing of course. You may have to pay. With an older TT
installation you'll probably need to add or upgrade the main bonding,
otherwise connection of your earthing conductor to the PME terminal will
be refused.

DIY bit if I have to stick with TT.
The solid porch floor needs re-tiling with another layer of ceramic
tiles on top of existing. To get an earth to an earth rod in a
suitable area it would need to cross the porch.
Can I cut a channel for the earth wire in the floor and lay conduit
for an electrician to use when the rod is moved? If so how deep does
it need to be and does it need to be covered by anything special?

Sounds OK. The earthing conductor to the rod will need to be 16 mm^2 if
it will be buried in the ground once outside. This will easily go
through 20 mm PVC conduit for a a straight run, but you'll need a larger
duct if there are many bends. There's no specific rule for depth in a
solid floor, other than "sufficient to avoid damage due to any
foreseeable disturbance".


Many thanks Andy. We had a new consumer unit and new bonding to the
water and gas earlier in the year.

We are in a village just outside Chelmsford. Most of the village has
underground electricity supplies but our 1960s box was fitted in to the
older area of the village which has overhead cables.