Cable Tray Cable Ladder

Why Limit Deflection?

     The primary reason to limit deflection in cable tray systems is appearance. Engineers and owners take pride in the appearance of their installations. So grid restrictions on deflection of cable trays installed at eye level or in a prominent location are common. However, it is neither economical nor good engineering paractice to restrict deflection of a cable tray system in lees prominent areas.

Methods of Decreasing Deflection

There are various ways to limit deflection of a cable tray. If the objective is minimal installed cost, they should be considered this order : 

• Deflection in any location can be reduced by increasing the depth of the load – carrying side members and/or by adding to their cross-sectional area. adding to the depth generally utilizes the material most economically.
• Decreasing span length. For economic reasons, this method of reducing deflection should be a last resort, since it increases field labor considerably. However, it can be an effective means to improve the appearance of an installation when the number of spans to be reduced is smal in comparison to the number in the entire installation.

Materials and Construction

     Cable tray systems are commonly fabricated from a corrosion-resistant metal or from a metal with a corrosion-resistant finish. The selection of the proper material is essentially an economic consideration.

• Aluminum Alloys Cable tray products are most widely formed from the 6000 series alloys. Alloys in this group contain silicon and magnesium in approximate proportions to form magnesium silicide, thus making them.
• Steel Steel cable trays are used principally in environments which are relatively free from corrosive attack. They are available with various types of corrosion-resistant finishes; usually hot-dip galvanized. The main advantages of using steel in cable tray fabrication are its high strength and low cost. Its disadvantages are increased structural weight, poor corrosion-resistance, and low electrical conductivity.

1. Hot rolled mild steel
2. Following JIS 3131 / SPHC
3. Or Equivanlent

• Stainless Steel  Stainless steel contains at least 10 percent chromium, along with other elements to develop specific properties. Depending on the quality of the elements present in a stainless alloy, SCM B-TRAY product, offers cable trays and accessories in both the 304 and 316 series. These austenitic alloys are remarkable in several respects. Unlike the other two classes, they contain nickel in quantities from 4 to 22 percent, while the percentage of carbon is kept relatively low. When chromium is increased for improved corrosion resistance, nickel must also be increased to retain the austenitic structure 304 stainless steel has chromium and nickel increased and carbon lowered to reduce carbide precipitation and increase corrosion resistance. Lowering the carbon content also makes welding easier. 316 stainless steel has molybdenum added to improve corrosion resistance and high temperature strength. The carbon content is also lowered to improve welding performance.

Metalic Finishes Galvanized

     Cable trays fabricated of steel can be protected from corrosion by coating with another metal, the most effective way and commonly use for protecting the Metalic Cable Tray is Zinc Coated also know as Galvanizing, Zinc protects steel in two ways. First it protects the steel as a coating and second as a sacrifical anode to repair bare areas such as cut edges, scratches, and gouges. The corrosion protection of zinc is directly related to its thickness and the environment. This mens a 0.2 mill coating will last twice as long as a 0.1 mil coating in the same environment. The Zinc coating or galvanizing process using one of the following methods: 

     Electro Galvanized Zinc Recomended Use Indoor. Electro galvanized Zinc ( also know as zinc plated or electroplated ) is the process by which a coating of zinc is deposited on the steel by electrolysis from a bath of zinc salts. This finish is standard for cable tray hardware and some accessories. Zinc Plated standard, provides a tough, adherent, protective film consisting of a mixture of zinc oxides, hydroxides, and carbonates. This fim is in itself a barrier coating which slow subsequent corrosive attack on the zinc. This coating is usually recommended for indoor use in relatively dry areas, as it provides ninety-six hours protection in salt spray testing per ASTM B117.

  Our finishing proces from fabrication of cable tray and ladder system is Hot Dip Galvanized, with method with min thickness 65 micron. ( Other finishing proscess such as powder painted, electri galvanized, etc by requested ). Hot  Dip Galvanized processing shal comply with standart   AS/NS 4680.

    All our fabrication finishing of cable tray and cable ladder system is HDG and provide and original HDG certificate for the product from HDG company where the galvanizing of cable ladder are produced.