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Posted by HeatPro on November 12, 2007 at 13:09:38:
In Reply to: Tstat Common Wire posted by Peter on November 12, 2007 at 11:49:14:
There are just two wires coming from transformers that can provide circuits isolated from ground; a transformer neither needs to do so, nor does a circuit necessarily have a particular one of the transformer wires attached to the ground. One of those two wires optionally picked to be a common source.
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