On Wed, 26 Jan 2011 06:56:08 -0800, Winston
wrote:

I Googled but didn't find anything that would
work quickly.

Who makes an inexpensive tester that I can plug
into 208 V 3 phase L14-30 outlets to determine
phase rotation?

I'm aware of this circuit but I want something
I can buy at the Borg and leave at a worksite:
http://www.opamp-electronics.com/tut...on_2_10_03.htm

--Winston


Hey Winston,

I don't know what "the Borg" is, but any industrial/wholesale
electrical supplier should have "Reverse Phase" relays available. Just
do a Google to see them. Most have a secondary function to drop out
if the applied voltage goes too low, and the really expensive ones
check for over-voltage too.

Take care.

Brian Lawson,
Bothwell, Ontario.