At the top of a 14' wall in a private residential (non commercial) work shop, I'd like to run about 100' of surface mount raceway, with THHN conductors inside of it. I plan to use 4"x4" raceway, for about 10-15 conductors (Despite being relatively large, it fits the space perfectly). I've read code saying you can put conductors in a raceway, but nothing that specifies any physical properties of that raceway. Can I use relatively lightweight PVC raceways with removable covers, similar to what I'd use for data cabling? (As seen in the picture) If not, what defines acceptable raceway?
Additionally, my plan is to knock out holes, and connect to the solid non-removable surface of the raceway using rigid conduit, for load center connections, surface mount outlets, etc. (In the same way I'd connect to any junction box). Is that acceptable?
Because of the out of the way location of the raceway I'm not worried about it being physically damaged, but I want to make sure the lightweight PVC raceway is acceptable from a code perspective.