wiring duct are rigid trays
wiring duct are rigid trays typically used as raceways for cables and wires within electrical enclosures. Cable tray systems consist of straight sections, fittings and accessories that form a rigid structural support for cables. They are generally available two configurations, slotted (the wiring duct has slots or fingers for easy customization and breakout) and slotless (solid wiring duct that do not have any fingers or slots).