Materials Used & Finishing Of A Cable Tray
07-July-2021 || By: Admin
Today
Cable Tray
have become a necessary piece of industrial and commercial construction by offering fast, practical and adaptable answers for these issues. Cable Trays are fit for supporting a wide range of wiring:High Voltage Power Lines.
Power Distribution Cables
Sensitive Control Wiring
Telecommunication Wiring
Optical Cables
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 .
Aluminium:
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
aluminium cable trays
are non-magnetic, electrical losses are reduced to a minimum. Cable tray products are formed from the 6063 series alloys which intentionally are copper free alloys for marine applications. These alloys contain silicon and magnesium in appropriate proportions to form magnesium silicate, allowing them to be heat treated. These magnesium silicon alloys possess good formability and structural properties, also as excellent corrosion resistance. The unusual resistance to corrosion, including weathering, exhibited by aluminium is due to the self-healing aluminium oxide film that protects the surface. Aluminium’s resistance to chemicals within the application environment should be tested before installation.
Steel:
Steel cable trays
are fabricated from structural quality steels employing a continuous roll-formed process. Forming and extrusions increase the mechanical strength. The main benefits of a steel cable tray are its high strength and low cost. Disadvantages include high weight, l ow electrical conductivity and comparatively poor corrosion resistance. The rate of corrosion will vary counting on many factors like the environment, coating or protection applied and therefore the composition of the steel. We offer finishes and coatings to improve the corrosion resistance of steel. These include pre-galvanized, hot dip galvanized (after fabrication), epoxy and special paints.
Stainless Steel:
Stainless steel offers high yield strength and high creep strength, at high surrounding temperatures.
Stainless steel cable tray
is roll-shaped from AISI Type 316 Stainless steel. Stainless steel is resistant to dyestuffs, organic substances, and inorganic synthetics at high temperatures. Higher levels of chromium and nickel and a reduced level of carbon serve to extend corrosion resistance and facilitate welding. Type 316 includes molybdenum to increase high temperature strength and improve corrosion resistance, especially to chloride and sulfuric acid. Carbon content is reduced to facilitate welding.Finishing of Cable Tray
Galvanized Coatings
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:
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.
Hot-Dip Galvanized:
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.
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