I cannot find anywhere in the NEC where it requires non metal-clad MV (or TC for that matter) to be run in conduit. Article 328 states that MV cable is permitted in cable tray and even direct buried (which we also propose to do). Article 328 does not make any reference to what cable construction...
I am trying to figure out what options are available for cable entries into switchgear and transformers on an NEC project.
We will be using both non metalclad 'Tray Cable' and non metalclad MV-90 cable. On a typical IEC project for this application I would use a brass industrial cable gland with...