Service entrance and a sub-panel
I am building a house on "stilts" because of the flood zone requirements. There is a "store room" downstairs the will probably be turned into a shop in the future. The house will be fed underground (200 amp in 2" pvc) to a meter mounted outside the downstairs wall. The main service entrance panel (200 MCB/40 circuit) will be installed in the upstairs laundry room. A sub panel will be installed thru the wall (slight offset) from the meter on the inside of the store room.
I have some basic questions before we do this....
In stead of a true sub fed panel, to save feeder wiring, can I pull 200 amp wire the downstairs 125 amp panel and then pull to the 200 amp service upstairs? Would the wire size have to be upgraded or the mains derated?
The way the house is designed (with limited access between floors because of the structural support systems), it makes it difficult to work between floors. Can #2 Romex be used between the meter and panels? How about for a sub feed off the main panel to feed down stairs? Do they even make romex that big?
An unrelated question ... beside the downstair storeroom is a "porch area" that is partially covered by the house and partial cover by an upstairs roof and decking. The "under the house" section will have a drywalled ceiling, but open walls. The under the deck section will get wet by rain water dripping through the decking. ... I will have light and fans mounted in the drywall ceil fed by romex. For some spot lights under the deck, I will feed thru the drywall with romex and the come through a joist to the underdeck area to feed the flood lights and a couple of receptacles. Can I continue the romex exposed and un-piped the light/receptacles? The boxes will need to be waterproof I am sure. How (or can you) transition between romex and pvc?