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Joined: Aug 2005
Posts: 1
OP
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I was asked the question what the difference between an "Open Delta Sevice and a Yankee or Y Service" was. I've looked in the code book and asked more than 5 electrician's and haven't gotten a definite answer. I was wondering if anybody out there could help me. I live in South Carolina, don't know if that makes a differance.
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Joined: Jul 2004
Posts: 9,643
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Wye is where the 3 phases are referenced to a central grounded point, looks like a "Y". That is your normal 208.
Open delta, delta "Vee" etc is a delta that skips one of the transformers. Imagine a triangle where you erased one of the sides. That is typically 240v and they centertap one of the secondaries for the ground.
The voltages will be 120/120/208 to ground and 240 between phases.
Open delta is a cheap way to serve a place that needs 3 phase and also 120v since it only takes 2 transformers.
Balancing the phases can be tricky but if done well it works.
Greg Fretwell
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Joined: May 2005
Posts: 706
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Ckeck out the Technical Reference section of this site for schematics of different services.
Dave
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Lostazhell
Bakersfield, CA (Originally Orange Co.)
Posts: 1,437
Joined: February 2004
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