color code for center phase grounded delta

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hcecabigdog

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I am in the middle of doing a 2005 code change seminar (yes Mike's). One of the participants comes up and says that he has been taking these seminars for years and nobody ever talks about a grounded delta system. I told him that to my knowledge there haven't been any changes other then maybe labeling the method of identifying at the panels when there are two systems. That's where is question lies. How should he identify the grounded conductor? I pointed him to 200.6, but also told him to check with local jurisdictions for amendments. Here in Baltimore County we just implmented a color code. It requires the grounded conductor of the 240 volt system to be marked as white with a red stripe and the 480 volt system gray with an orange stripe. This got me thinking, how are other areas requiring it or are they just going back to 200.6.
Thanks for any comments
 
Here we did have a requirement for a purple marking on the high leg for the POCO. I think that it has been removed, but the two POCO's that we deal with both require the high leg to be landed in the 'C' phase of the metering equipment.
 
Trevor,
but the two POCO's that we deal with both require the high leg to be landed in the 'C' phase of the metering equipment.
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That is true in many cases and often required for the correct operation of the metering equipment. Even though it is landed in the C phase position, it is still B phase as far as the rotation goes.
Don
 
Is the original question how to mark a 240V 3w corner grounded system or a 240/120 4W high leg delta?

You title says one thing but your text says something different.
 
jim dungar said:
Is the original question how to mark a 240V 3w corner grounded system or a 240/120 4W high leg delta?

You title says one thing but your text says something different.
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Thanks Jim for pointing out that my response is out in left field. I don't believe that the OP was regarding a corner grounded delta. Disregard my answer since it's irrelevant to the OP. My apologies.
 
sorry i thought i was specific. 3 phase delta, center phase grounded. not the center of one phase which derives a "high" leg.
 
hcecabigdog said:
sorry i thought i was specific. 3 phase delta, center phase grounded. not the center of one phase which derives a "high" leg.
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You were, my reading skills failed me on that one.
 
hcecabigdog said:
sorry i thought i was specific. 3 phase delta, center phase grounded.
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Many people call this sustem a grounded-B phase or simply a corner ground. It is your use of the phrase "center phase grounded" that opens it up to misinterpretation.
 
Back to the OP question. White or Gray per Art. 200. The different stripes are above Code and would only be required when to different systems are in the same enclosure. Could be aaccomplished simply by white and gray.210.5 is only for ungrouned conductors and references you back to 200.6

Corner grounded 480v? Never seen it. I think I read it was not as common as 240v corner grounded. Any comments on that??
 
sandsnow said:
Corner grounded 480v? Never seen it. I think I read it was not as common as 240v corner grounded. Any comments on that??
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Seen it, done it, don't want to do it again

I can not think of many voltage system that do not exist somewhere (POCO or internal to an industrial) in Wisconsin and da UP.

On second thought, I have never done a corner grounded 600V system.
 
Sorry. Many people in "my area" call it center phase and there is no misinterpretation. Maybe the problem is is where the "b" phase is loated. I thought that it was placed in the center, but that's just me.
 
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