Fittings for conduit passing through ceiling/floor
Depending on the type of conduit used, the codes for securing and supporting it are a bit different.  In general, the conduit will have to be supported every 3-10 ft, depending on the type and size conduit used.
Fireblocking between floor may also be required.

International Residential Code 2012
Chapter 3 Building Planning
Section 302 Fire Resistant Construction
R302.11 Fireblocking. In combustible construction, fireblocking shall be provided to cut off all concealed draft openings (both vertical and horizontal) and to form an effective fire barrier between stories, and between a top story and the roof space.
Fireblocking shall be provided in wood-frame construction in the following locations:
4. At openings around vents, pipes, ducts, cables and wires at ceiling and floor level, with an approved material to resist the free passage of flame and products of combustion. The material filling this annular space shall not be required to meet the ASTM E 136 requirements