Single Phase/ Three Phase Meter Center

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Npstewart

Senior Member
Working on a building that requires (33) meters. (32) of those meters are 125A/2P , then I need (1) 200A/3P for the house panel.

Wall space is tight so I was using stacks with (6) meters each, which means I have (6) columns of meters, all with (6), but the last stack is (3) high.

Is there any way to get 3-phase over to that last stack while still using single phase for two of those meters? Should I move the 3-phase meter adjacent to the main?

A quick sketch is attached.
 

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John120/240

Senior Member
Location
Olathe, Kansas
Since all of the meters will be fed by bus I think having the three phase meter closer to the MAIN makes more sense to me, but what do I know.
Others will chime in.
 
don_resqcapt19

don_resqcapt19

Moderator
Staff member
Location
Illinois
Occupation
retired electrician
Assuming that the service voltage is 208Y/120 the busing will all be 3 phase with just two legs tapped to each meter. What are you doing for a main disconnect?
 
kwired

kwired

Electron manager
Location
NE Nebraska
Have you selected your gear manufacturer/model numbers?

As mentioned if you don't have you will need a main disconnect somewhere. Any chance of just tapping the feeder to this meter center somehow and putting in an individual three phase meter socket if it is not easy to get one as part of the meter center? Could even provide a second service disconnecting means - but would need to be grouped with the first one.
 
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Npstewart

Senior Member
Sorry, I never got a notification email so didn't know anyone replied.

I have a call into square D to make sure this is possible.

I didn't want to do another run to the transformer for this panel because I figured it would be an extra expense that should't be required.

I have another building with 40 units and I did actually do another run to the transformer because my load exceed 1200A. Rather than upgrading the service equipment I figured in THAT case, another run to the transformer would make sense.


I will see what square D says. Even though the meters are single phase, I believe the bussing is still 3-phase in the meter centers, and the meters just alternate between phases correct?
 
kwired

kwired

Electron manager
Location
NE Nebraska
Npstewart said:
Sorry, I never got a notification email so didn't know anyone replied.

I have a call into square D to make sure this is possible.

I didn't want to do another run to the transformer for this panel because I figured it would be an extra expense that should't be required.

I have another building with 40 units and I did actually do another run to the transformer because my load exceed 1200A. Rather than upgrading the service equipment I figured in THAT case, another run to the transformer would make sense.


I will see what square D says. Even though the meters are single phase, I believe the bussing is still 3-phase in the meter centers, and the meters just alternate between phases correct?
Click to expand...

If Square D and three phase bus - it has to be the EZ Meter Pak series.

They have both single and three phase "branch units".

You may need to use up an entire "column" with your three phase branch even if it only uses one meter position.

here is metering section of online catalog, meter centers are near the end pages.

http://editiondigital.net/publication/?i=150041
 
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