Because here's an interesting wrinkle with fiber. Fiber is allowed in power conduitsprovided it is entirely non-metallic. So if you build your conduit network fully NEC Chapter 3 shipshape and in Bristol fashion, you can use them for additional AC power circuits - up to four in fact. For that matter, you could do a hybrid system where you use full. This is pipe that is designed to interconnect electrical junction boxes. It comes in a variety of forms: flexible, non-flexible, metal or plastic. Most of them provide for curves called "Sweeps" - which provide an easy, at least 5" radius bend for all curves. Or they use a flexible conduit which naturally limits sharp turns. I for one dislike plast. A properjunction box has sides and a back, with round knockouts which the conduit enters. That's intended for AC power wiring which must be enclosed, but you're welcome to use it for datacomm (and if metal, provides RF shielding). Data cables only require a backless "non-box" such this minimalist one. (note swinging ears for clamping to drywall, a.
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