Nominal 3 phase voltage is 240v, nothing wrong there.

Sounds like the CNC tap was incorrectly selected. What were the other
options?

I know of ground problems with CNC's and Com cards that can cause the
same problem.

I believe it is something else, 245 is only 11% high, not a really big
issue.

Cheers

"Ignoramus20157" wrote in message
...
245 volts is only mildly on the high side and should not cause the
symptom described.

i

On 2009-07-05, John E wrote:
I have been asked to offer an opinion in a sensitive situation.

A machinist moved his shop across town and required some rewiring
(3-phase
outlets, conduit, etc.) in order to locate some machines where he
wanted
them.

He hires a guy who's not a pro (and later discovers is not insured)
but has
done shop wiring before and had a good attitude and track record. The
guy
does good work. No complaints about the quality of his work.

Owner throws the switch, all works fine.

The story continues 4 weeks later when the very expensive CNC fries
its
controller PCB to the tune of $4000.

Turns out the voltage in the shop was upward of 245 and the taps in
the CNC's
power supply were set for 220.

What is the legal and moral responsibility of each party?

What will not be helpful are replies about the character or
intelligence of
either of the players or their actions.

Thanks.