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Depending where you are on the transmission line the voltage and # of
phases vary. Rule of thumb is the higher up and wider apart the highter the
voltage. When you get to individual residential street level and you look at
the pole there generally is one wire at the top of the pole which is
ground/neutral. Below that there are usually two wires on a cross tree and
may have a potential of 4800volts. Below that you will see the transformer
with taps on the three wires then the laterals to the home from the xformer.
The two insulated have 220v potential between them and 110v between either
insulated and the bare.
Drive around an industrial area and you will see the same
arrangement only there will be 3 wires on the cross tree. When loads require
it they will sometimes run a second set of primarys - just look for the
transformers and you can see the supply side terminations to confirm.
Bob
PDQ 36
Peace
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