Cable tray system for outdoor or corrosive environments should be designed keeping in mind the material. Hot dip galvanized steel cable tray after fabrication has been used for many years.
Delivery and Availability
Aluminium cable trays can be shipped from a factory within short period. Small orders are shipped within few days, depending upon manufacturer’s workload. Galvanized cable trays take many days to fabricate, hot-dip galvanize, and then finally ship the material.
All the manufacturers of cable trays need to send the trays to third party for galvanizing them. Cable trays are manufactured, packed and then shipped to the galvanizer. Some manufacturers return the material to plants for inspecting the product after galvanizing before final shipment. Some other manufacturers depend on galvanizer to inspect and prepare the order for final shipment. The cost of delay in getting material to jobsite is the cost of material.
Galvanized steel cable tray has another issue. If you place thin gauge steel covers in a hot zinc bath it will cause the covers to warp. In order to overcome this problem, thicker material is used and which makes the covers limited to six feet long. The extra material and labour required to install shorter covers has an impact on the cost of the entire cable tray system.
Despite of all, galvanizing cable trays are better as they have been used for a long time and they provide extra durability and protection to the steel underneath.
Aluminium cable trays resists corrosion in many of the chemical environments and are used in paper mills and petro-chemical plants. Copper-free aluminium used by manufacturers can have some chloride that can effect marine environment. However, this corrosion is limited and does not affect structural integrity of system.
If you are galvanizing on steel cable the layer slowly wears away for protecting the steel. If the coating is removed from any place, it can limit the product’s service life before time.
Design and Installation
Field cuts are easy with aluminium cable trays not because aluminium is easy to punch, cut or drill but there is no need to apply protective coat to exposed edges. Hot-dip galvanizing coating on steel need to be repaired with zinc rich paint known as cold galvanizing which is not as good as original galvanizing which leaves a chink in steel’s armour against corrosion. There might be chance where the cuts are not repaired and it can become an obstacle in cable tray’s corrosion resistance.
Hot dip galvanizing trays are heavyweight as compared to aluminium trays and it requires more installers for keeping it in place.
If one has to choose between aluminium and hot dip galvanized steel cable trays one should go for galvanized steel cable trays. This is because people from a long period have used them and they are much better than aluminium cable trays.
Galvanizers provides consultancy services to the clients. We offer galvanizing services in private and public sectors like power, telecommunications, railways etc. We have modern machineries, latest technology and experienced engineers that help in the making of quality products at best price.