On Tue, 01 Sep 2015 22:08:45 GMT, Johnny B Good wrote:

It is my understanding that the neutral connection on the LV secondary
will be independently connected to a local earthing spike or spikes
provided by the utility company responsible for the supply. It may not
be as good a low earth resistance connection as that provided in urban
substations but it'll be a damn sight safer than relying on an 11 or 6
KV distribution neutral connection (assuming such a connection is
provided or even needed in the higher voltage levels of the distribution
network).

If you ever wander out in the thr countryside and look at the 11 kV
power distribution it's all three wire, just the three phases. With a
signle phase transformer one side will be connected to a real earth
connection at the pole, in our case it looks like a bit of 25 mm^2
before it disappears behind the protective capping and under ground.
This earth may or may not be carried on a seperate wire into the
house, around here the pole to house connection is mainly just two
wire, phase and neutral earth combined.

I'm now going to hit send and take a look at what the 'experts' have
said and see how big a fool I may have made of myself. :-)

The only glaring error is the use of LV to differentiate 240 from 11
kV. To the DNO's 11 kV is "LV", I think 33 kV might be be lowest "HV"
but it could be 125 kV.

--
Cheers
Dave.