Paul Hovnanian P.E. wrote:

"John E." wrote:

[snip]

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


So far, no problem.

A nominal 240V service can vary +/- 5% and be within power quality
specifications. Equipment (nameplate) ratings are normally lower to
acount for voltage drop. A 120V service powers 110V appliances. A 240V
service powers 220V loads.

Paul, I take my hat off to you sir...

I knew some one here would finally get it right!