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At my new lake house, I'm planning to rebuild an unattached shed and make it a Shed/Bunkhouse combo. The current wiring to the existing shed (which is rotting away) has many issues (code wise) and is fed from a 30amp breaker from the house panel. This has been disconnected as soon as we closed on the property. (picture 10/2 wire from a 30 amp break with a 14/2 wire "extension" pigtail because one wire was too short feeding a 100amp breaker at a post by the drive, then a 14/2 wire from there thru the door of the shed [with door closing on the romex] wired to the main lugs of an old Federal breaker box w/o cover and that feeding a 240 plug for a clothes dryer, lights and plugs).

Anyway, here's my idea...

We may have guests stay in the bunkhouse and they would not have access to the shed, so i'll need to put a panel in both rooms in case breakers trip and need to be reset by guests. Please tell me how off base I am on this idea and offer any suggested changes.

The image below is a main service disconnect located immediately below the meter on the outside wall of the main house. It has copper 2/0 wire coming in from the meter and out to the service panel in the house.

(some links provided in this paragraphs for the products I'm considering using)

I want to tap into the lines below the 200amp main disconnect breaker with same copper 2/0 wire to another box containing a 100amp breaker below it. From there use awg 2 aluminum (rated 90C) to run to the new shed (about 70 feet) and the bunkhouse (another 10 feet or so) in a parallel manner. (So the only upstream breaker to either of those two panels is the 200 amp main disconnect and the 100amp breaker beside it where the aluminum starts). Both of these panels would be rated 100amp (and do not have their own main breaker) with the understanding if the shared amperage between the two reaches 100 amps, it would trip the 100amp breaker next to the main disconnect. Also understanding that if the shared amperage between these two panels and the 200amp panel in the house exceeds 200 amps, then the 200amp main disconnect breaker below the meter would trip. I don't see either of these cases ever happening under normal circumstances. But it does ensure protection.

Some assumptions. This 200amp main disconnect appears to have neutral and ground bonded before and after the breaker, So the panel inside the house would be considered a subpanel and it should NOT be bonded there (I have not checked if that's the case yet). Also the 100amp breaker I add next to this would also be considered a subpanel and not have them bonded (nor in the individual panels in the shed and bunkhouse).

Okay.. let me have it... :)

PS. I just saw this thread and reading those bullet points makes me believe that everything I stated above is okay. One thing I saw though leads me to believe that using 2/0 wire for the tap to go to the 100amp breaker is overkill and only requires the conductors to allow 100amp ampictiy, so awg 2 aluminum or awg 3 copper should suffice as the tap from the main disconnect to the 100amp disconnect that will feed the 2 new panels.

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