Ladder and ventilated trays may have solid covers to protect cables from falling objects, dust, and water. A ladder tray has the cables supported by a traverse bar, similarly to the rungs of a ladder, at regular intervals on the order of 4 to 12 inches (100 to 300 mm). Small cables may exit the tray through the ventilation openings, which may be either slots or holes punched in the bottom. Ī ventilated tray has openings in the bottom of the tray, allowing some air circulation around the cables, water drainage, and allowing some dust to fall through the tray. A deep, solid enclosure for cables is called a cable channel or cable trough. A solid-bottom tray provides the maximum protection to cables, but requires cutting the tray or using fittings to enter or exit cables. Several types of tray are used in different applications.
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