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  • Method for Installation of Cable Tray (Part-2)

Method for Installation of Cable Tray (Part-2)





 Cable-Tray-Installation-Standards-Guidelines | Cable-Tray-Systems.


8-February-2022 || By: Admin



Cable trays especially

perforated cable trays

and baskets are designed to help support and organize cable bundles along with ceilings or walls.

Cable tray systems

are the ideal solution for running large amounts of power or data cables above or below ground. Hutaib Electricals manufactures various

types of cable trays

which have applications in different industries. Methods used for installation of cable trays are an important aspect for effectively using cable tray systems. We have discussed below some basic standards and guidelines to follow while installing cable tray supports at various locations.


In case you have not checked our part 1 of this blog. Have a look at it before reading below.


Horizon Tee Support: NEMA Standard

  • Support holders for horizontal T-mount accessories must be placed no more than 610mm (24″) from each end of the accessory on the supplied ladder. The conduit must also be supported once on each side rail. For tees with a radius of 305mm (12), support position no more than 610mm (24) from each end of the attachment on the included ladder.

  • Horizon Cross Support: NEMA Standard

  • Support Holders for crosshairs shall be located no more than 610mm (24 ″) from each end of the connector on the supplied ladder.
  • The fitting conduit must also be supported once on each side rail. For a 305mm (12) radius cross, place the brackets no more than 610mm (24 ″) from each end of the fitting on the supplied ladder.

  • Reducer Support: NEMA Standard

  • Fix the horizontal supports (2) at a distance no more than 610 mm (24″) from each of the ends.

  • Horizontal Y Support: NEMA Standard

  • Locate horizontal supports at a distance no greater than 610 mm (24″) from each of the three openings and at the center of the fitting at 22.5°.

  • Vertical Inside / Outside Support: NEMA Standard

  • Vertical cable tray elbows at the top of runs must be supported at each respective end. At the bottom of runs, they should be supported at the top of the elbow and within 610 mm (24″) of the lower extremity of the elbows. Both Inner and outer fittings should be additionally supported at a distance no more than (24″) from each end.

  • Offset Reducing Connection & Tray to Box / Floor Connection:

    Cable Tray Installation

  • Make sure that conductors, dimensions, heights and other accessories are leveled and coordinated with other utility equipment.
  • The width of the cable tray/trunk/ladder should be wide enough to accommodate cables without clutter and must allow for 25% clearance in the future. Cables should not be stacked.
  • If the conductors of the cable tray or ladder belong to different systems, the ELV and data processing or have different insulation, the ladder or cable tray must be separated. Use insulation barriers where necessary. However, engineer approval is required.
  • Earth soil continuity must be ensured over the entire length of the tray and trunking.

  • Cable Tray Installation on Roof / Floor:

  • Cable trays should not be placed directly on the ground or on the roof.
  • Cable trays installed on the roof must be supported by GI supports or concrete blocks.
  • It should be mounted far enough off the ground or roof to allow water to drain.
  • The cables must exit from the bottom of the cable tray.
  • When cable trays are installed on roofs or exposed to sunlight, factory-manufactured covers should be installed to protect cables from direct sunlight.
  • Cable trays must be arranged so that the cover is always on top or on the side. The cover must be secured to the trunking with a factory-fitted clamp.
  • The open ends of the tray/trough must be covered with a specially designed end cap.

  • Cable Tray Accessories:

  • Where cutting of the trays is needed, round saws may be used. Different types of Cable tray reduced edges may be rasped or welded if it's far necessary, galvanized factors may be wiped clean then it is going to be sprayed with galvanizing spray immediately.
  • Cut part of trays and trunking, will be made free from sharp edges through submitting and covered with zinc abundant and pinnacle coat and joined the usage of fish-plates with bolts and nuts.
  • Any slicing at the cable tray to be accomplished alongside the strong region and now no longer throughout the perforation of the cable tray. Burrs want to be eliminated and cuts want to be included with anti-rust galvanized paint to save you rust.
  • The minimal radius of the cable tray needs to be identical to the minimum bending radius of the cables. Depending on the variety of cables to be located withinside the device it could be effective to apply the following maximum radius.

  • Installation of Splice Connectors

  • Splice couplers shall be positioned according to the manufacturer's recommendations.
  • Splice Joints should be designed and placed to maximize the rigidity of the cable tray.
  • Splice connections shall be secured with button/hexagon head bolts with nuts and washers located on the outside of the tray or ladder unless otherwise specified by the manufacturer.
  • Thermal expansion splice joints should be installed wherever expansion joints are available.
  • All straight joints, elbow joints and offset couplings must be performed with care using standard accessories (fish-plate and couplings). Only where it is not suitable should use elbows/manufactured offsets.

  • Cleaning of Work Area:

  • After installation, there must be a visual inspection of the trunk line from the inside. This is to ensure that it is free of debris, burrs, and litter.
  • There are no sharp edges that could damage the cable during installation.
  • Galvanized coating damaged by excessive roughing during transportation and erection should be repaired using at least two coats of good quality zinc rich paint in accordance with BS 4652.
  • Upon completion of the installation of cable trays/trunks in an area, the completed work must be presented for inspection and must be protected by the provision of a polythene cover.

  • Codes and Standards:

  • IS 4759: Hot-dip zinc coating on structural steel and other related products
  • IS 2629: Recommended practice for hot-dip galvanized iron and steel
  • IS 2633: Test method for uniformity of coating of zinc-coated products
  • IEC 61537: Cable Management Cable Tray System and Cable Ladder System
  • BS 4652: Specification for zinc-rich primer
  • National Electrical Manufacturers Association (NEMA) Standard




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