Not exactly (In most North American 110 - 0 - 110 volt residential/single
phase farm systems).
Although the term phase/s is sometimes, incorrectly, used for each of the
two 'legs', each of which are 110 volts to the neutral or zero volt centre
tap from the electric utility distribution transformer.
The two leads are normally the two 'ends' of a single, 'single phase' 220
volt, centre tapped winding.
One way to look at it is; while one end is at positive polarity the other
end is at negative polarity etc. hence 110 volts and 110 volts = 220!
In other words the two 'legs' are of the same phase but opposite polarity.
If the two wires were truly, say two phases of a 3 phase system, their
voltages would be some 120 degrees 'out of phase' i.e. (apart).
Seems that to install a pump-house light there might be three 'safe'
1) Use a 220 volt bulb.
2) Use two 110 volt bulbs in series.
3) Use a small transformer to 'transform' the 220 to 110 volts. This would
conventionally be a 2 to 1 'step down' transformer capable of carrying say,
4) Illegal; not necessarily safe and might lead to disqualification of
insurance? is to use the ground as a neutral return!
1) Simplest and cheapest? 2) Make sure everyone understands it. 3) Seems
unnecessarily expensive. 4) Not recommended at all.
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