2 questions: grounding and feeders

[infinity]

Doesn't 215.2(A)(3) permit this?

IMO I would say no. 215.2(A)(3) references 310.15(B)(6) which requires the full load to the dwelling unit to be served if using Table 310.15(b)(6). If he had only one panel then I would say it applies.

 

[TOOL_5150]

I failed to mention, this will be installed in accordiance of NEC 2005.

However; where in the 2008 code book does it state I cannot use SER [3 cond w/ground] 4/0 to serve a 200A sub?

As far as my project, I decided to use pipe and wire to 1 panel, then nipple over to a [possible] second and just use polaris connectors in the first panel.

We are still in the planning part of the project, and its up in the air if nat. gas is avalible at the site. Customer would like to have a gas WH and stove/oven. otherwise it will be a bunch of baseboard heaters and electric everything.

~Matt

 

[Volta]

I failed to mention, this will be installed in accordiance of NEC 2005.

However; where in the 2008 code book does it state I cannot use SER [3 cond w/ground] 4/0 to serve a 200A sub?

As far as my project, I decided to use pipe and wire to 1 panel, then nipple over to a [possible] second and just use polaris connectors in the first panel.

We are still in the planning part of the project, and its up in the air if nat. gas is avalible at the site. Customer would like to have a gas WH and stove/oven. otherwise it will be a bunch of baseboard heaters and electric everything.

~Matt

Section 338.10(B)(4)(a) requres us to comply with Part II of Article 334.
334.80 requires us to figure the ampacity in accordance with the 60 deg C rating. In the 2005 book we are exempted from following 334.80 for SE cables.

If 2008 code, then, you would be using 150 amp 4/0 where the feeder did not carry the entire load. If you fed directly to the first panel, with no taps or splices, then you would be ok per 310.15(B)(6).

 

[infinity]

As far as my project, I decided to use pipe and wire to 1 panel, then nipple over to a [possible] second and just use polaris connectors in the first panel.

We are still in the planning part of the project, and its up in the air if nat. gas is avalible at the site. Customer would like to have a gas WH and stove/oven. otherwise it will be a bunch of baseboard heaters and electric everything.

~Matt

Matt, care to explain why you need so many circuits and only a 200 amp service?

 

[curt swartz]

I don't understand why you would go to so much work to get 200 amps to the second panel. Trying to splice 3 4/0-3 SER cables in a typical residential loadcenter is not going to be easy. Dennis's suggestion is how I would do this. 200 amps to the first panel and 100 breaker in the first to feed the second. Put all of you large loads in the first panel. If you already have the panels you can still fed the 200 amp main breaker panel with 100 amps.

 

[TOOL_5150]

Matt, care to explain why you need so many circuits and only a 200 amp service?

Its a custom remodel, all rooms will be on their own CB, kit will have 3-4 circuits, lights will not share circuits with general receptacles... etc. its not known how many circuits will be needed as of yet, but I want to be able to add another 40 right next to the first 40 if needed.

~Matt

 

[TOOL_5150]

I don't understand why you would go to so much work to get 200 amps to the second panel. Trying to splice 3 4/0-3 SER cables in a typical residential loadcenter is not going to be easy. Dennis's suggestion is how I would do this. 200 amps to the first panel and 100 breaker in the first to feed the second. Put all of you large loads in the first panel. If you already have the panels you can still fed the 200 amp main breaker panel with 100 amps.

This does sound more reasonable, and probably what I will do. Like I said, it is still in the planning process now, so all the suggestions will help.

~Matt