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Large residential service question #184783 02/21/09 01:45 PM
Joined: Aug 2005
Posts: 250
T
Trick440 Offline OP
Member
I have a 5000sq ft. existing home. 2 - 200a panels fed off a 320a meter can.

They are doing a 4500sq. ft. addition. That will include an indoor pool, geo thermal, basketball court, laundry rm, kitchen, bath, bar & pool table rm, storage, lots of outside flood lights.

They would like 2 panels in this addition. One for the pool and Geo, and one for the rest of the addition. (I may tell them just one panel cause the run is over 200', times that by 2 and thats a hell of a run.)

So the question is what do you think is the best option to do this service? CT cabinet?



Shake n Bake
2017 / 2014 NEC & Related Books and Study Guides
Re: Large residential service question [Re: Trick440] #184786 02/21/09 03:57 PM
Joined: Feb 2003
Posts: 939
F
frenchelectrican Offline
Member
4500 sqft addtion that is pretty good size there.

Did you do the load calucations yet so far ?

I am not suprise you will end up using 600 or 800 amp service there but check with your POCO for upperlimit for single phase service otherwise end up getting triphase service installed.

The last mega sized house I did work on it was a shy over 12K sqft that place end up having 800 amp 3 208Y120 service installed in there { I could go with single phase however the three phase line is there so might well use it anyway }

I am pretty sure you will end up useing the CT metering set up.

Merci,Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)

Re: Large residential service question [Re: frenchelectrican] #184795 02/21/09 09:57 PM
Joined: Jan 2004
Posts: 1,507
G
George Little Offline
Member
Well, first of all you need to do a load calculation on the residence and then add to the existing load, the proposed load.

You currently have an underground service feeding a 400a. meter can and will be adding a geothermal system. The geothermal will require a separate meter and will probably require a new lateral from DTE.

My suggestion is to call DTE and work with them as to whether or not they will need to increase the size of the lateral. They will need load calculations.

As for running two panels to the addition, I don't think that will be necessary but you will probably need to run circuits to the heating equipment for the pumps and the backup resistance heating.


George Little
Re: Large residential service question [Re: George Little] #184796 02/21/09 11:39 PM
Joined: Aug 2005
Posts: 250
T
Trick440 Offline OP
Member
Load calc, and contact DTE. And then from that point it looks like a CT setup. Thanks.

George why will the Geo require a separate meter? This will be my third Geo and all have been on homes with a single meter.


Shake n Bake
Re: Large residential service question [Re: Trick440] #184798 02/21/09 11:49 PM
Joined: Jan 2004
Posts: 1,507
G
George Little Offline
Member
All the Geothermal systems I've inspected (about 10) have separate meters so they can get a reduced rate on their electric bills.

Be prepared to hear from DTE that they will need to change the lateral once you go to a CT cabinet.


George Little
Re: Large residential service question [Re: George Little] #184799 02/22/09 12:25 AM
Joined: Aug 2005
Posts: 250
T
Trick440 Offline OP
Member
Thanks George.


Shake n Bake
Re: Large residential service question [Re: Trick440] #184975 02/26/09 10:34 PM
Joined: Jul 2004
Posts: 9,541
G
gfretwell Offline
Member
The funny thing about all of this is the utility will probably put this whole thing on a 25KVA transformer ... shared by the neighbor.


Greg Fretwell

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