According to the National Electrical Code (NEC), a cable tray is a unit or assembly of units or sections and associated fittings forming a rigid structural system used to securely fasten or support cables and raceways.TechLine Mfg. manufactures limited-width, perforated channel-type cable tray, one of several types of cable tray available on the market. (Others include wire basket, ladder tray, solid bottom tray, trough tray, etc.)