Posted by John T on July 11, 2016 at 09:57:13 from (216.249.81.101):
In Reply to: Re: Ground wire? posted by Pete black on July 11, 2016 at 08:48:05:
Good comment Pete, looks like you have a handle on this.
You state "Three phase distribution lines are different"
INDEED YOURE CORRECT as if three phase was configured DELTA it has no Neutral, only the three conductors carry the current, but if its configured Y, it has a Neutral and like in single phase, its probably earth grounded. Every Y system I designed sure was.
I like your statement about returning to the source as some lay people think it returns to mother earth NOT the voltage potential difference is between the phase conductors but it just happens that the Neutral is tied to mother earth for lightning and surge protection and to keep and stabilize the grid at one common low voltage reference MOTHER EARTH. Of course, there exists a potential between HOT and earth in a grounded system as the Neutral is earth grounded YET THE CURRENT STILL RETURNS TO THE SOURCE AS YOU SO WELL STATED.
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