The MCT system it is a kind of fire stop using plugs of chloroprene [neoprene] fitted on a cable diameter and introduced in a metallic frame. Usually it is mounted on a wall opening where a channel continues from a side to another of the wall. The cable could be supported by a cable tray or running directly on the channel floor.
NEC permits cable of 1000 V or less to occupy the same cable raceway if the insulation is the same.[see art.300.3] So control cable could occupy the same raceway with power cables[usually]. Instrument cable only as permitted on 725 and 727 articles. See-for instance:
