gordo wrote:I'm running about 30 ft of EMT conduit from my live room to the control room for tie lines, etc. Is it advisable to keep all mic and instrument lines in separate conduit, and run speaker and Furman CAT5 headphone stuff in a second run of EMT? I'm running Gepco for mic lines.
Yes, it is advisable to run mic/line audio, amp output, and video (if applicable) in separate conduits. Ideally control signal cabling is run separately as well (RS-232/CAT5 or 6/Cobranet/RS-485, etc...).
Also, pull some spare mic/line STP for future. Pull a spare pull-tape or cord in each conduit so you can run more in the future.
Ideally your conduits should be sized for no more than 20-40% fill ratio. 24 runs of Belden 8451 will need a min. 1-1/2" conduit. 4 pairs of speaker (12 guage belden 9700) should be in a min. 1-1/2" conduit too. I usually run 2" conduits for this type of stuff (4" conduits for snake lines in live setups). That will give you room for future growth. This is especially important when your conduits are going in slab floors. Remember no more than 180 degrees of bend without a pull point (pull box/j-box).
Good luck!