In message , ARW
writes
On 01/03/2020 13:37, AnthonyL wrote:
So in the coffee bar this morning chat pondered on 3-phase and how to
know which of the 3 wires was which phase. I've done some googling
and would like the experts to confirm:
1. It doesn't matter which wire is which phase providing the
sequence
of 1-2-3 2-3-1 or 3-1-2 is maintained when connecting, or any pair
swapped if that is what is required.
2. The voltage between any two phases is 440v and it doesn't matter
which two
and
3. The voltage between any phase and ground/neutral is 240v
Is that correct?


Yes

Are there any conditions when the phase needs to be known? If so how
is it detected?


As long as you know the 1-2-3, 2-3-1 or 3-1-2 rotation you should be OK.

Synchronising a generator?

--
Tim Lamb