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Electrical :Grounded 3 phase
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Sand Flat Bob
Posted 5/17/2008 07:31 (#379755 - in reply to #379594)
Subject: RE: Electrical :Grounded 3 phase


John..neAR - 5/16/2008 22:31

Can someone explain Grounded 3 phase.

In the fuse box it has a copper pipe in place of fuse in the center fuse position.

Also on the contactor coil has 480v to ground rather than 240 to ground and 480 across poles? Makes it more complicated to hook up a shut off timer.

Thanks,

John

Is this system on Arkansas Power and Light? At least that is what they were called back in the 1960's. I am a retired EE and I did a lot of work up in that country back in stone ages. Ran into this a lot. The open Delta system on 480V was used everywhere. My experience was with buildings. It took an act of congress to get them to supply a Delta wye system. The required them to put in 3 transformers instead of two. That wild leg was a killer on the open Delta system. I thought that that system was illegal by most codes now.

I would call your friendly utility and have them explain what you have or a local electrician should have lots of experience with it.

Good Luck,

Bob
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