What is the difference of multi-conductor cable versus a flexible cable? I use multi-conductor cables as feeders via cable tray from distribution board to panelboard. Are multi-conductor cables shall be installed in accordance with flexible cables or cords where cannot be used as substitutes for the fixed wiring of a structure?
Hey Jessie thanks for your question. The difference between cables and flexible cords is a little blurry especially with the title of Article 400 - Flexible Cords and Flexible Cables. If we look as some of the different types in Table 400.4, some are called cables and some are called cords. But if the product being used is in Table 400.4 - in general it would not be allowed to replace the fixed wiring as stated in 400.12(1).
The wiring methods allowed in cable trays are in Table 392.10(A). Notice that flexible cables or flexible cords are not included.