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Ralph Mowery

In article ,
says...

Really big users will have even higher voltages. The plant I worked for
had a power room where the power from the electric company was converted
from whatever they sent us to 13,200 volts. This was sent to other
parts of the plant where it was mostly conveted to 480 V 3 P. There was
some equipment that used around 4,000 volts. I did not usually work
with that and don't recall the exect voltage, want to say 4100 volts.

Then we got is some...

It may have been 4160 which is one of the distribution high voltages I worked with in industrial and island power systems. ^_^

[8~{} Uncle Zapped Monster

That sounds right to me. We had all kinds of voltages in that plant and
I never did memorize some of them as I seldom worked on them.

Mainly worked daily with the 480, 120 aC, and some low voltage 24
volt/20 ma DC instrument loops. It really was important to pay
attention as to what wires you were on as sometimes all that and some
thermocouple wires could all be in the same cabinet inches apart.

Then I came across a couple of 208/120 Volt 3 phase type circuits.