Cable Tray Selection
Cable Tray Selection Process
- Select Material and Finish
- Select the Tray Load Class
- Select the Tray Type
- Select the Tray Size
- Select the Fittings
- Consider Deflection
1 Select Material and Finish
The most suitable material and finish for your application will depend on cost, the potential for corrosion, and electrical considerations. It offers cable tray systems fabricated from corrosion-resistant steel, stainless steel and aluminium alloys along with corrosion-resistant finishes, including zinc, PVC and epoxy. Special paint is also available.
2 Select the Tray Class / Load Capacity
The standard classes of cable trays, as related to their maximum design loads and to the Associated design support spacing based on a simple beam span requirement, shall be Designated in accordance. Please note the load ratings in are those most Commonly used.
3 Select the Tray Type
Cable tray is available with three styles of bottom:
Ladder Cable Tray is a prefabricated structure consisting of two longitudinal side rails connected by individual transverse members.
Ventilated Cable Tray is a prefabricated structure consisting of a ventilated bottom within integral or separate longitudinal siderails, with no openings exceeding 4 in. in a longitudinal direction.
Solid Bottom Cable Tray is a prefabricated structure without openings in the bottom.
4 Select the Tray Size
The width or height of a cable tray is a function of the number, size, spacing and weight of the cables in the tray. Available nominal widths are 6, 9, 12, 18, 24, 30, 36 and 42 inches.
5 Select the Fittings
Fittings are used to change the size or direction of the cable tray. The most important decision to be made in fitting design concerns radius. The radius of the bend, whether horizontal or vertical, can be 12, 24, 36 or 48 in.
6 Consider Deflection
Deflection of the cable tray affects the appearance of an installation, but it is not a structural Issue. In the case of non-metallic cable tray, deflection may be affected by elevated Temperatures.