Tim+ wrote:

The Natural Philosopher wrote:
On 07/07/2019 15:46, Tim+ wrote:
Harry Bloomfield wrote:
The Natural Philosopher has brought this to us :
It is three phase and the rail is one phase and is earthed.

Phases are only phased with respect to each other, they dont care
about their relationship with 'earth'.

I see how that would work now. I had in mind star, with the centre
point grounded - a delta output transformer with one point to ground
would do it.


Oh well,I'm glad someone does. ;-) Our physics classes never progressed to
three phase power when I was at school and I've never had a need to
understand it in any depth (or at all really) since then.

Blimey.

I sort of thought that anyone in a DIY group would have basic electrical
knowledge


You call it "basic" but it's knowledge needed by 0.01% of the population I
would hazard. I guess the education system I went though didn't see it as
important.

Of course I could spend time reading up on it but without any need to
understand it it any depth at all, I prefer to do other things with my
time.

Hands up every DIYer here who dabbles with three phase power?

Tim
Please Sir, I've got a 1hp variable frequency three phase inverter for a
lathe motor. I had to think hard about the connections.

--

Roger Hayter