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#86421 - 10/23/03 06:28 PM 300 amp. resi. service
johnd24 Offline
Member

Registered: 07/11/01
Posts: 66
Has anyone ever installed a 300 amp. service for a new single family dwelling.If so can i parellel 4/0 alum. to line side of meter socket....can i come off of load side of meter socket with 4/0 alum to feed my 200 amp. m.b. panel and #2 off of load side of meter socket to feed my 100 amp. m.b. panel.
Of course using double lugs.
Thanks !!!!!

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#86422 - 10/23/03 06:52 PM Re: 300 amp. resi. service
Ryan_J Offline
Moderator

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
Unless I'm reading this wrong, I would say you're O.K. The only thing I'm wondering is where your disconnects for the service entrance conductors will be. Aslo, as you describe it, be aware that you will need a 1/0 grounding electrode conductor, not a number 2. By the way, I've never seen a 300 amp panel...who makes it?
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Salt Lake City

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#86423 - 10/23/03 07:14 PM Re: 300 amp. resi. service
johnd24 Offline
Member

Registered: 07/11/01
Posts: 66
The panels with main breakers will be located within 3' of the meter socket,in the basement of the home.One will be a 200 amp. main breaker panel the other right next to it will be a 100 amp. main breaker panel.
#2 is not the grounding electrode conductor,its the load side of the meter socket to my 100 amp. panel.
I will have double lugs in my meter socket 1 set of lugs will have 4/0 alum. wire for the 200 amp. panel,the other set of lugs will have # 2 alum. for the 100 amp. panel.

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#86424 - 10/23/03 07:27 PM Re: 300 amp. resi. service
Ryan_J Offline
Moderator

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
I think you'll be O.K.

BTW: I understood what you meant with the number 2, I was just sizing the GEC by the combined circular mills of the service entrance conductors for my own practice as much as anything.
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Salt Lake City

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#86425 - 10/23/03 09:20 PM Re: 300 amp. resi. service
Fred Offline
Member

Registered: 04/30/01
Posts: 461
Loc: Straughn, IN 47387
See 250.66(A)for GEC size. If the electrode is rod, pipe or plate, and is the sole connection, #6 cu or #4 al.

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#86426 - 10/24/03 03:26 PM Re: 300 amp. resi. service
johnd24 Offline
Member

Registered: 07/11/01
Posts: 66
Thanks again guys !!!!

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#86427 - 11/03/03 09:51 PM Re: 300 amp. resi. service
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
I have to do one next week..... Around here we do it as a 320a service*, 2- 200a feeder. It comes as a single package meter/main combo. The two main cb's can be swaped out for whatever you like, under 200a of course.
B-line makes them, and I think Cut Ham does too. (* our Utility here frowns on any single residence getting a 400a service, but they allow this. )
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