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Contructed from single sheet of perforated metal.They are convenient for cables which require both a degree of protection from external damage and some ventilation.
Straight sections of ladder type cable trays consist of two longitudinal side rails, connected by individual transverse members, or rungs, which are welded to the side rails or bolted in case of GI trays.
This type of cable tray provides maximum ventilation to heat producing cable such as power cables.
Straight sections of solid bottom cable trays contructed from single sheet of metal, providing excellent protection from external damage. They are used primarily for intrumantal control, communication and other non-heat producing cables.