07-July-2021 || By: Admin
Cable Tray Materials:
Most cable tray systems are fabricated from a corrosion-resistant metal (low-carbon steel, chrome steel or an aluminium alloy) or from a metal with a corrosion-resistant finish (zinc or epoxy). The choice of fabric for any particular installation depends on the installation environment (corrosion and electrical considerations) and price .
Cable trays fabricated of extruded aluminium are often used for his or her high strength-to-weight ratio, superior resistance to certain corrosive environments, and simple installation. They also offer the advantages of being lightweight (approximately 50% that of a steel tray) and maintenance free, and since
Stainless steel offers high yield strength and high creep strength, at high surrounding temperatures.
Finishing of Cable Tray
The most commonly used coating for the cable tray is galvanizing. It is cost-effective, protects against a wide variety of environmental chemicals, and is self-healing if an area becomes unprotected through cuts or scratches. Steel is coated with zinc through electrolysis by dipping steel into a shower of zinc salts. A combination of carbonates, hydroxides and zinc oxides forms a protective film to guard the zinc itself.Protection from corrosion is straightforwardly identified with the thickness of the covering and the harshness of the environment.
Pre-galvanized, also referred to as mill-galvanized or hot dip mill-galvanized, is produced during a steel mill by passing steel coils through molten zinc. These coils are then cut to size and manufactured. Areas not normally coated during fabrication, like cuts and welds, are protected by neighboring zinc, which works as a sacrificial anode. During welding, a little region straightforwardly influenced by heat is additionally left uncovered, however a similar self-recuperating measure happens. G90 requires a coating of .90 ounces of zinc per sq ft of steel, or .32 ounces per sq ft on all sides of the metal sheet. In accordance with A653/A653M-06a, pre-galvanized steel isn't generally recommended for outdoor use or in industrial environments.
After the steel cable tray has been manufactured and assembled, the whole tray is immersed during a bath of molten zinc, leading to a coating of all surfaces, as well as all edges, holes and welds. Coating thickness is determined by the length of time each part is immersed in the bath and the speed of removal. Hot dip galvanizing after fabrication creates a way thicker coating than the pre-galvanized process, a minimum of three .0 ounces per sq ft of steel or 1.50 ounces per square foot on all sides of the sheet (according to ASTMA123,grade 65). The process is recommended for cable trays used in most outdoor environments and many harsh industrial environment applications.