I should have known better, network engineers don't work on the physical infrastructure very much anymore - memories of sitting on concrete floors crimping cable ends in to many IXPs :-) If you never seen or installed ENT Electrical Nonmetallic Tubing Conduit, also known as "smurf tube" -- here is a new YouTube video of someone installing a smurf tube between an external DEMARC and internal distribution point for his fiber connection. https://www.youtube.com/watch?v=NUCe9lAWY4U In the U.S. - ENT is UL listed as electrical conduit and can be used in most residential (and some commercial) runs. Commonly used for low-voltage and fiber runs in the US. I'm not an expert on other countries wiring codes. ENT is not the same as in-rack wiring management products (i.e. the split-wall plastic wire holders).