You can do that but you have to mind the cable sizes and have breakers in the panels so that you don't overload the cable from the main breaker. You could feed 2-100A panels off a 200A main breaker, but each panel would need its own 100A breaker, sorta like feeding a 30A circuit off a 200A panel, you need that 30A breaker in there so it does not pull a full 200A. You can get a thingie (not sure what it is called) that will screw onto the post off the load side of the 200A breaker, then turns into two holes to slide your two panel feed cables into. Some breaker panels have those two connections provided,. I got some of those "adapters" to put on the load terminals of the meter panel to feed my 2-200A panels.

Interesting, when I submitted my electrical plan, one of the guys in the inspection office said I had made an error. A 400A meter is really a 320A meter, so he was concerned that 2x200A breakers/panels would overload it. Not so, as the 200A breakers are rated at 80% ( 160A) to trip, so that even if both breakers/panels were drawing full load they would trip at 160A, keeping them in the 320A meter limit.

Here are some pics:
http://2.bp.blogspot.com/-7InQXxhJqg8/TfKWVSMCJoI/AAAAAAAAAjU/YW1BCciTyIY/s1600/DSC_0365.jpg

http://3.bp.blogspot.com/-IpbfZVsaA5E/TfKWWOamvjI/AAAAAAAAAjY/GsZapWeaseM/s1600/DSC_0366.jpg

http://3.bp.blogspot.com/-BubiliYBoPU/TfKWWiaT2HI/AAAAAAAAAjc/eZhdydDNCnk/s1600/DSC_0367.jpg

There are some interesting aspects to the electrical code once you dig into it, but most of it is pretty logical. I am sure your code is similar to the US National Electrical Code (which most all jurisdictions adopt), I found some used books on Amazon for cheap that detail it all -- sorta NEC for Dummies but oriented to field electricians and training/reference. Same for plumbing...

--R

On 12/3/11 2:19 PM, Randy Bennell wrote:
I have wondered about putting in a main breaker and then some form of splitter box and running a couple of 100A panels off of it. That way, I could just leave my original panel in place and add another.

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