Sorry I don't have easy access to the recent NEC, and I find it hard to search for answers in whatever excerpt of the code posted online -- they speak a different language!
I hope someone with experience may know the answers off the top of his head. Could that be you?
1. Can I hide electrical wires under crown molding? This is to retro fit more lights into a room without opening up the ceiling.
2. The previous owner left a metal conduit in the crawl space that runs three 10 wire gauge wires inside from the service panel to a junction box, but it terminates there. Can I run a 10-3 NM from that junction box (with the ground attached to the metal junction box) into my kitchen for a 30A/240V oven? If yes, I suppose at the service panel, I need to connect the conduit to the ground bus too, right?
3. I will have a split duplex receptacle to serve dishwasher and instant hot, each on its own dedicated circuit. Can I run a 12-3 NM and share neutral?
4. Has 2011 NEC disallowed MWBC?