On Sun, 08 Nov 2015 08:59:34 -0000, harry wrote:

On Saturday, 7 November 2015 20:20:46 UTC, Tough Guy no. 1265 wrote:
On Sat, 07 Nov 2015 20:13:05 -0000, Fredxxx wrote:

On 07/11/2015 20:01, Tough Guy no. 1265 wrote:
On Sat, 07 Nov 2015 19:38:55 -0000, Chris Hogg wrote:

On Sat, 07 Nov 2015 19:27:07 -0000, "Tough Guy no. 1265"
wrote:

On Sat, 07 Nov 2015 19:12:57 -0000,
wrote:

On Saturday, November 7, 2015 at 4:42:25 PM UTC, Tough Guy no. 1265
wrote:
I looked this up, I'm asking the question at the top. The replies
don't seem to be able to agree. Any sensible opinions?

http://electronics.stackexchange.com...e-mains-supply


--
It said, "Insert disk #3," but only two will fit!

Because mains is an AC system, there is no such thing as a totally
isolated system. There is always some capacitance between the
conductors and earth which all adds up.

Why do builders have isolating transformers then?

And electric shaver sockets in bathrooms? I would think they're just a
small version of whole-house isolation?

Perhaps it's just because it's always been done that way, and that way
is cheaper than having a beefy transformer in every garage.

The substation could isolate. Just don't clamp neutral to the ground.
4 wires come out of the secondary side of the substation transformer,
leave them away from the ground, and take them to the houses as normal.

Do you understand about 3-phase distribution?

If you don't clamp neutral to ground, what do you think will happen to
each phase voltage wrt ground?

230V is enough for me!

If isolated, no phase has any voltage with respect to ground, just like a battery sitting on your desk has no voltage with respect to ground.

Batteries are only safe because they are usually only low voltage.

Irrelevant to the fact that they have no voltage WRT ground.

--
What does Michael Jackson like about twenty-eight year olds?
The fact that there are twenty of them.