Years ago for FRC we bought some coiled pnumatic tubing like this
http://www.freelin-wade.com/coiled-tubing-hoses.html cut the fittings off and ran our wires through it. Not only did it act as a protector for wires but was very useful for an elevator for wire management ( the main reason we tried it). The big negative is the lack of serviceability if something goes wrong inside the tube but it might just do the trick for you.
Also you will need to check FTC legality. While I think it would be legal, it is never bad to do a Q&A on it.