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#1 |
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Member
Trade: resi elec newbie
Join Date: Dec 2006
Location: Tucson, AZ
Posts: 84
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3-phase, 3-wire Delta Service W/ Grounded Conductor
Third question:
Reading 250.24 (C)(1): The last sentence refers to "[t]he grounded conductor of a 3-phase, 3-wire delta service...". Um, that doesn't compute for me. In a 3-phase service, there are 3 hots. And, it doesn't say corner grounded or anything. Here's a picture of what I think a 3-phase, 3-wire delta service looks like: ![]() So, what's the grounded conductor on 3-phase, 3-wire delta service? Thanks. |
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#2 |
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Pro
Trade: Union Electrician
Join Date: Oct 2007
Location: Chicago
Posts: 135
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Re: 3-phase, 3-wire Delta Service W/ Grounded Conductor
I believe it is a reference to corner ground systems. Otherwise known as grounded B phase. I've never come across one, but I've heard of them. Here is a link for more reading:
http://ecatalog.squared.com/techlib/...008926800b38e9 |
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#3 |
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Service & Repairs
Trade: Electrician
Join Date: Dec 2006
Location: Rahway, New Jersey
Posts: 3,998
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Re: 3-phase, 3-wire Delta Service W/ Grounded Conductor
The NEC 2005 HANDBOOK says that only if the utility company provides a grounded conductor do you need to bond and install a grounding electrode system to the service.
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#4 | |
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Master Electrician
Trade: Electrical
Join Date: Sep 2007
Location: Midwest
Posts: 428
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Re: 3-phase, 3-wire Delta Service W/ Grounded ConductorQuote:
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