600a service w/ ct can

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Get a copy of the electrical requirements for services from your local utility. They are usually free and will give diagrams as well as approved materials for the job. Remember what the NEC allows may not be what the utility co. wants.
 
dcl34769 said:
Get a copy of the electrical requirements for services from your local utility. They are usually free and will give diagrams as well as approved materials for the job. Remember what the NEC allows may not be what the utility co. wants.
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Good response, our poco allows us a 600 to be a single metered single phase K 5 style meter can,we don`t go go CT till 800 range.check with the poco engineers.
 
allenwayne, are you saying for a 600 amp single phase 3 wire residential 120/240 volt service you can use a standard meter w/o ct's?
 
crankshaft said:
allenwayne, are you saying for a 600 amp single phase 3 wire residential 120/240 volt service you can use a standard meter w/o ct's?
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Yes.I have installed several of them here.The meter is basically a commercial single phase bolt in unit.No CT`s needed just a standard line load connection in the meter can.
 
allenwayne said:
Yes.I have installed several of them here.The meter is basically a commercial single phase bolt in unit.No CT`s needed just a standard line load connection in the meter can.
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What are you using? The only larger meter sockets we know of are the 320 amp meter sockets we use on what is considered a 400 amp service.
 
chris bippen said:
any suggestions, i'm trying to avoid mistakes, it's my 1st time
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Chris, we have installed alot of the larger size services. One thing you need to do is remember that along with the disconnect, if it is located next to the ct enclosure is the meter itself. Plan out the installation with some good measurements. Measure out where your wire is going to route and mark your knockouts in the best spot. Remember, you probably going to be working with 2 sets of 300 or 350 kcmil copper. That is not 500 kcmil but it still does not bend like a #12 copper in a panel.

I just sent a post a couple of weeks ago about the lack of wireway size in a 600 amp ct can. The POCO here allows us to feed the incoming wire on the bottom if it is an underground feed.

If you have a top feed, than is a different story, but still we have routed things out so they fit best.

Without knowing what you have as far as disconnect location, meter location, panelboard location and other things. It is hard for us to tell you much more than that. Give us more information about what exactly you have, then maybe some of us can help you with the installation.
 
With CTs in a service it depends on the type of can your using.
There are the outdoor ones that are not much different that mounting a regular meter, only a bigger can, with a meter mounted on the cover.
Some also have the grounded conductor bonded in the can, so you can bond the supplemental ground to the grounded conductor.
The ones we use don't, so we bond just to the can by adding a lug. We use metal conduit be tween the CT and the main.

The large Switch Gear ones, that are indoors, don't have meters already on them. You might have to ask the POCO if they want the meter outside or if you can mount it inside. We usually mount them on the CT portion of the cabinets door.

Edit to add" The wiring harness between the CTs and the meter is 4 #10s and 4 #14 plus a ground (at least thats what is used in our area) so make your nipple or conduit run large enough for those conductors
 
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Hey Guys,

The largest Meter Enclosure the POCO provides here in our area is a 320A Can, they actually also allow it to be 400A Con. as well, thats what they tell everyone anyway because they don't wish to stock CT models for residential applications and say if a larger one is needed that the EC would need to purchase it and submit it to the POCO for evaluation and approval.

the 400A is about the largest we see around here, however their are a few who are hitting a gutter and popping up to (2) 320A meter cans for 600A services.....the POCO is allowing this and the AHJ is allowing this. However, I have not been privy to any of it.....or actually seen any !
 
radiopet said:
The largest Meter Enclosure the POCO provides here in our area is a 320A Can, they actually also allow it to be 400A Con. as well,
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A 320 meter socket is rated 320 continuous 400 non continuous.

What is the standard continuous rating of a typical 400 amp OCPD or two 200 OCPDs?
 
I am just telling ya what the local POCO stated on their 320A cans and what they are allowing ....not what I made up...:), While we deal in 80% cont. ( inverse 125%) of the 400A enclosure....why would the POCO accept it's use for 400A Cont. in that statement.

Have you ran into any of that in the industrial setting Bob?

I have not seen any residentials over 600A personally...sorry forgot reference

230.42 Minimum Size and Rating
(A) General The ampacity of the service-entrance conductors before the application of
any adjustment or correction factors shall not be less than either (A)(1) or (A)(2). Loads
shall be determined in accordance with Article 220. Ampacity shall be determined from
310.15. The maximum allowable current of busways shall be that value for which the
busway has been listed or labeled.
(1) The sum of the noncontinuous loads plus 125 percent of continuous loads
(2) The sum of the noncontinuous load plus the continuous load if the serviceentrance
conductors terminate in an overcurrent device where both the
overcurrent device and its assembly are listed for operation at 100 percent of their
rating
 
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