[AMPS] Question About Correct Phase for 240V Transformer Primary Windings ???

Tom Rauch W8JI@contesting.com
Fri, 18 Aug 2000 14:51:31 -0400

> Hi Fellas, A question for you High Voltage Transformer Guru's. I have an
> unlabeled transformer. I have found the primary windings. This transformer
> can be powered by 120 or 240 volts. Heres the question. How can you tell
> the phase of the windings in order to properly set up for 240 operation.
> I'm not sure if this will help determine it but the pig tails of the
> windings are Brown/Black and the other is Blue/Yellow. As always any help
> would be greatly appreciated...  Thanks, Kurt, K3KL...

Run it at real low voltage (like 5 volts or less), and measure the 
voltage on the secondary(s). You can be sure the phase is right, 
and check the turns ratio that way.

73, Tom W8JI

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