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10 AWG can be solid. 8 AWG and larger should be stranded. 2008 NEC 310.3 2011 NEC 310.106(C)
No, the conduit has to be supported individually from a supportive structure. The spacing of the strapping is related to the size of the conduit.
A trade size hole for a 2-1/2" EMT conduit connector, the hole needs to be 2-7/8" in diameter. A 3" rigid conduit can also use this size hole without the lock nuts falling into the hole.
50 mm or 2 inch will handle the 3/0 wires for a 200 amp service.
i just left lowes an they told me to run 100 amp to my building i would need wire size 2-2-2-4 alumninum and run it in conduit the lowes around here does not sell copper wire that size