The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Industrail Control Panel bonding per 409.108
by sparkyinak
Yesterday at 06:29 PM
Calling all Non-US members!! (Non-US only)
by aussie240
12/07/16 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
New in the Gallery:
12.5A through 0.75mm flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 10
sparkyinak 9
Texas_Ranger 8
Potseal 6
Who's Online
0 registered (), 194 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#184783 - 02/21/09 10:45 AM Large residential service question
Trick440 Offline
Member

Registered: 08/15/05
Posts: 248
Loc: Waterford, MI, USA
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

Top
2014 / 2011 NEC & Related Books and Study Guides
#184786 - 02/21/09 12:57 PM Re: Large residential service question [Re: Trick440]
frenchelectrican Offline

Member

Registered: 02/06/03
Posts: 938
Loc: Wi/ Paris France { France for ...
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?)


Top
#184795 - 02/21/09 06:57 PM Re: Large residential service question [Re: frenchelectrican]
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
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

Top
#184796 - 02/21/09 08:39 PM Re: Large residential service question [Re: George Little]
Trick440 Offline
Member

Registered: 08/15/05
Posts: 248
Loc: Waterford, MI, USA
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

Top
#184798 - 02/21/09 08:49 PM Re: Large residential service question [Re: Trick440]
George Little Offline
Member

Registered: 01/18/04
Posts: 1492
Loc: Michigan USA
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

Top
#184799 - 02/21/09 09:25 PM Re: Large residential service question [Re: George Little]
Trick440 Offline
Member

Registered: 08/15/05
Posts: 248
Loc: Waterford, MI, USA
Thanks George.
_________________________
Shake n Bake

Top
#184975 - 02/26/09 07:34 PM Re: Large residential service question [Re: Trick440]
gfretwell Offline

Member

Registered: 07/20/04
Posts: 9045
Loc: Estero,Fl,usa
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

Top



ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals