Trough-type cable trays-fully enclosed cable trays often referred to simply as "troughs" or "trunking"-are primarily used for laying control cables for highly sensitive systems, such as computer and communication networks; they offer shielding against electrical interference and protection in highly corrosive environments.
Material selection depends on the operating environment: composite epoxy resin (anti-corrosive and flame-retardant) is used for highly corrosive environments; composite epoxy resin trays are selected for outdoor locations; and composite structural designs are required for long-span sections. Support and suspension systems must be configured according to the tray specifications, number of tiers, span length, and load requirements. For multi-tier installations, the center-to-center spacing between tiers is set at 200, 250, 300, or 350 mm. Covers are supplied with the trough units, while other accessories are interchangeable with those used for ladder-type and tray-type systems. Metal cable tray systems require reliable grounding, and grounding connections in areas subject to vibration must be fitted with spring washers.
