On 2016-01-15, Martin Eastburn wrote:
I had students with a Can manufacturing company that got a big
machine that was 3-phase all over it. the motors had to start
in the correct direction the first time. I seem to recall something
like gear train destruction would occur. I luckly found a Neon lamp
tester in a magazine that fit the bill. This was in the early 70's.

Such things should be protected by "three phase rotation relays".

i