Fiber optic communication was used multiple times on the inner wall

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 plas...