On 19/03/17 14:13, NY wrote:
"Harry Bloomfield" wrote in message
news
NY has brought this to us :
Out here in a North Yorkshire village there seem to be 11 kV spurs, each
with a pole-mounted transformer to step down to 240V. Where I'm
sitting I
can see the end of the 11 kV line and its transformer. Its 240V
cables go
underground to houses on one side of the road (probably built in
1950s) and
then come above ground to 3-phase 240V overhead wires to the houses
on the
other side of the road (1930s).

Are you sure it is 11Kv - more likely it will be 3.3Kv.

Ah, I wasn't aware that there was an intermediate distribution voltage
between 11kV and 240V.

There arent.

Are most power lines on pairs of wooden poles
with big glass insulators and pole-mounted transformers 3.3 rather than
11 kV?

No.

This is the pole https://s22.postimg.org/n6x2dkkip/IMG_0456.jpg

I hadn't spotted the four horizontal wires in the foreground. I was
wrong: the 240V evidently goes underground to the back of just one
terrace block and then 3 phases and neutral runs between the three
terrace blocks, with alternating phases - same as in our older terraces
on the other side of the road from the 3.3 kV.


--
"I am inclined to tell the truth and dislike people who lie consistently.
This makes me unfit for the company of people of a Left persuasion, and
all women"