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#82083 - 10/16/02 08:34 AM High phase
Steve T Offline
Member

Registered: 02/14/01
Posts: 312
Loc: Oak Park, IL, USA
I had a contractor inform me that the utility required the high phase to be the C phase. I told him it has to be the B phase.

Is it acceptable to install the high phase as C phase in the CT cabinet and then become the B phase in the MDP?

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#82084 - 10/16/02 10:11 AM Re: High phase
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
The high leg must be landed in the right side position in most metering equipment to make the meter work correctly. When you come out of the meter to the service disconnect, you must move it to the center position. Look at 408.3(E) and the exception.
don

[This message has been edited by resqcapt19 (edited 10-16-2002).]
_________________________
Don(resqcapt19)

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#82085 - 10/16/02 01:35 PM Re: High phase
tdhorne Offline
Member

Registered: 03/22/01
Posts: 344
Loc: Maryland, USA
Don
For the sake of my continuing education would that mean that if the metering equipment is in a separate enclosure that the high leg would have to be terminated on the B phase of the service equipment but if it is in the same enclosure as the metering equipment it can follow the metering arrangement? Understand that the only delta power I have done has been derived systems rather than service equipment.
--
Tom

[This message has been edited by tdhorne (edited 10-16-2002).]
_________________________
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison

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#82086 - 10/16/02 01:45 PM Re: High phase
resqcapt19 Offline
Member

Registered: 11/10/00
Posts: 2209
Loc: IL
Tom,
You are correct. If the meter is in the same enclosure, you are permitted to keep the high leg in the C phase position. As soon as you get to a second enclosure the high leg must be in the B phase position. If you use a phase rotation meter, you will find that the high leg is always B phase. It is just something in the meter configuration that requires the high leg to be in the right hand or C phase position.
Don
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#82087 - 10/16/02 02:34 PM Re: High phase
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Some highleg whys and wherefores covered at http://electrical-contractor.net/ubb/Forum1/HTML/001784.html

With modern solid-state meters, aside from old customs and habits, the righthand/highleg location does not matter any more so far as accurate meter registration is concerned.

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#82088 - 10/21/02 09:24 AM Re: High phase
Steve T Offline
Member

Registered: 02/14/01
Posts: 312
Loc: Oak Park, IL, USA
Thanks Don

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