What's the situation in other countries?
Here in NZ especially in the W.E.P.B. area it's a 50% correct or reversed saga.
I maintain the phase sequence or rotation has to be correct ( clockwise ) at the LT side of a distribution transformer and at the customer premises. Certainly for new jobs!! Some powerboards were "exempt" from the regs. and didn't always bother to check. When wrong excuses, It's too hard, or we do it later, ran out of time.
For the sake of a couple of extra minutes at the job. at least its done correctly.
The generators we connect up in case of cable faults and other unplanned outages are all Red,Yellow,Blue, clockwise.
At night faults.
There is always the uncertain part. Was this transformer wired up correctly or not?
We try to confirm it where there is a 3 Ø customer nearby, but this is not always possible in suburbia. There could be a 3Ø sewer pump or 3Ø garage workshop with a lathe etc.
Also it makes a shambles of the colour coding of the cables sometimes.
