What are the key points to consider when selecting trough type cable trays?

 

 

1. The use of trough type cable trays and their supports and hangers in corrosive environments should be made of corrosion-resistant rigid materials, or anti-corrosion treatment should be adopted. The anti-corrosion treatment method should meet the requirements of the engineering environment and durability.

 

 

 

2. In sections with fire protection requirements, trough type cable trays can be equipped with fire-resistant or flame-retardant materials such as plates and nets to form a closed or semi closed structure in cable ladders and trays. Measures such as applying fire-resistant coatings on the surface of the cable tray and its supports and hangers should be taken, and its overall fire resistance performance should meet the requirements of relevant industry norms or standards.

 

 

 

3. Aluminum alloy cable trays should not be used in places with high requirements for fire prevention in engineering.

 

 

 

4. The selection of the width and height of the trough type cable tray should meet the requirements of filling rate. The filling rate inside the cable ladder and tray is generally 40% to 50% for power cables, 50% to 70% for control cables, and it is advisable to reserve a 10% to 25% engineering development margin.

 

 

 

5. When selecting the load level of the cable tray, the working uniform load of the cable tray should not exceed the rated uniform load of the selected cable tray load level. If the actual span of the support and hanger of the cable tray is not equal to 2 meters, the working uniform load should meet the requirements.

 

 

 

6. The specifications and dimensions of various components and supports and hangers should match the straight section and bending series of trays and ladders, while meeting the corresponding load conditions.

 

 

 

7. When selecting the bending or up/down device of the trough type cable tray, it should not be less than the allowable bending radius of the cables inside the cable tray.

 

 

 

8. For steel cable trays with a span greater than 6m and aluminum alloy cable trays with a span greater than 2m or a load-bearing requirement greater than load level D, strength, stiffness, and stability calculations or experimental verification should be carried out according to engineering conditions.

 

 

 

9. When several sets of cable trays are laid parallel at the same height, maintenance and repair distances should be considered between adjacent cable trays.

 

 

 

10. The standard length of a straight through single piece for trough type cable trays can be 2, 3, 4, or 6 meters.