The steel sheets used to make up the PG trays are zinc-coated. These are slick, polished, and cheaper. Ordinarily, the coating thickness ranges between 12 and 20microns (Z120-Z275). They are ideal in office buildings or factories that are clean. Most cable tray systems are fabricated from a corrosion-resistant metal (low-carbon steel, stainless steel or an aluminium alloy) or from a metal with a corrosion-resistant finish (zinc or epoxy). (1) Aluminium: Cable trays fabricated of extruded aluminium are used for their high strength to weight. In determining the proper aluminum alloy for structural applications such as a ventilated cable tray system, the design engineer should recognize the advantages inherent in using alloys that are heat-treatable and of being able to fabricate the structure from materials possessing known minimum. ies aluminum alloys (Aluminum Association designation) to manufacture cable tray. The full-shaped HDG trays are dipped into a large. Steel cable tray with a Hot-Dip Galvanized after Fabrication (ASTM A123) finish has been used successfully for many years.
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