(2) 200 amp panels on 200 amp service.

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StreamlineGT

StreamlineGT

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I'm sure this is an easy one, but I've never sone a service like this, so I am asking. I have a 200 amp service for a single family dwelling. I want to run two 40 circuit panels from this service, but with each panel being able to support 200 amps. The transfer switch can't be double lugged, so I am making connections in the trough. Is this even legal? If so, do I have to mark the panels with circuit #'s 1-80?

Diagram

ArchangeliServiceLayout-1.jpg
 
StreamlineGT said:
I'm sure this is an easy one, but I've never sone a service like this, so I am asking. I have a 200 amp service for a single family dwelling. I want to run two 40 circuit panels from this service, but with each panel being able to support 200 amps. The transfer switch can't be double lugged, so I am making connections in the trough. Is this even legal? If so, do I have to mark the panels with circuit #'s 1-80?

Diagram

ArchangeliServiceLayout-1.jpg
Click to expand...


can you say 400 amp xfer switch?
 
Why would I have to goto a 400 amp transfer switch? The transfer switch has a 200 amp main breaker in it. Therefore the service with be 200 amps, with an 80 circuit panel.
 
with a "service rated" 200 amp transfer switch as the service equipment, as long as you have not exceeded your calculated load, I see no problem.
Add as many panels as you like.
(1 breaker per outlet :) )
 
wireguru said:
leave more room for tel and catv, and wheres the network wiring?
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No networking, just a wireless setup. Not really into the computer thing, so they said they didn't need it. They are already over budget on the things they wanted in the house, like 106 recessed cans (house is 3000 sq ft.), and a stand-by generator.
 
3000 sq ft. Depending on the type heat and many other varibles, 200 amp might be questionable. Did you (or anyone) do a load calculation ?
In this area it would be more common to see one of the panels connected as service (for non-generator loads0 as well as the transfer switch.
 
I would do a load calculation too.

I would do a load calculation too.

I just put in a 400A (320A) service on a house this size. After the house was built he added a swimming pool, bath house and a small living quarters by the pool. I would ask the owner a lot of questions before I just put 200 in. Make sure they won't be adding anything else.
 
Why can't you make the first panel a main breaker feed-thru and the second a main lug?

Doesn't Sq D have some panels now with 84 circuits that you can buy in the US?
 
I don't think it's anything that weird, since he mentioned double-lugging the load side of the TS. He's asking whether it's okay to have two 200a main breakers after the TS which has only a 200a breaker as its service disconnect.

I'd say it's okay, since you could have a single 400a main breaker following a 200a main breaker. Now, if the T/S's service disconnect was just a switch, it wouldn't be compliant, with a 200a switch followed by two 200a breakers.

I agree with the idea of one panel on the T/S and one panel straight through, and have done it that way. He would need a 320a service for that. He could still use the same T/S that he has now, which would become one panel's main.
 
Maybe I wasn't clear in the original post, but I want to have 2 panels, that are rated for 200 amps, but I don't want to have to worry as to which panel has the large loads. I though originally of having a 200 amp with a 100 amp sub, but with neatness in mind, and the way the home runs are laying out, both panels will have large loads in them. Basically all I am asking is if both panels need breakers, if the transfer switch has a 200 amp breaker in it.

As for the load calc, it was done, and they have gas appliances. The only large loads are the AC units.
 
StreamlineGT said:
do I have to mark the panels with circuit #'s 1-80?
Click to expand...

I was at a job where they had a fifty or so panels in the place and not a single panel had a duplicate number. They started with 1 and were up to 850 plus circuits. Point is you can label them how you want, they are not designated the same.

Rick
 
I recently did a load calc for a new building and came up with more than 200A worth of load, so I sized the service with a 400 service panel and (2) 200A subs. The Utility came back and ruled that they will only provide a 200A meter socket.
So I now have a 400A frame main (with a 200A trip) in the service panel (400A worth of service entrance provided by the owner) and (2) 200A subs, since the panels were bought already, and I want to be sure that if the main trips, it is on the utility to upgrade, and my client only has to change the main CB.
 
negative the transfer switch tranfers form the srveice to the gen and back agian . Looks like you need a 400 A xfer switch and a 400 amp service , or designate one ml a gen panel and sub it off the other ml .
 
bartajr said:
negative the transfer switch tranfers form the srveice to the gen and back agian . Looks like you need a 400 A xfer switch and a 400 amp service , or designate one ml a gen panel and sub it off the other ml .
Click to expand...

I'm going to disagree, what would be the difference if I ran one 200amp main panel, and 2 - 20 circuit sub panels fused at 100amps each? Why would you need a 400amp service if the calculation doesn't need it?
 
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