The cable tray is mainly used for laying cable lines, while the metal trunking is mainly used for laying wires. The materials of the two are also different. The bridge is generally made of cold-rolled steel plate, while the trunking is made of hot-rolled steel plate. The shape of the metal trunking is the same as that of the trough type cable tray, but the size of the metal trunking is slightly smaller and there is a gap between the material performance. Let's follow the Jinan cable tray manufacturer to learn more about it.
Difference between metal trunking and cable tray: the width of metal trunking is generally less than 200mm, while that of cable tray is generally greater than 200mm. Metal trunking is mainly used for laying conductors. The bridge is mainly used for laying cables. There is only one kind of metal trunking, which is generally made of hot-rolled steel plate. When laying cable tray, its load, disturbance, filling rate, etc. shall be generally considered.
The metal trunking is roughly equal to the herbivorous cable tray. Some knowledge shows that the size of the metal trunking is smaller. The two laying methods are different in flow. Galvanized iron sheet is generally used for metal trunking, and cold-rolled steel plate is generally used for bridge. From the appearance, the metal trunking is relatively smooth and the installation is relatively firm.
There are also great differences in material.
The metal trunking shall be flat without distortion and deformation, and the inner wall shall be smooth without burr. When the metal trunking is installed vertically or obliquely, measures shall be taken to prevent the wires or cables from moving in the trunking.
All phase wires and neutral wires of the same circuit shall be laid in the same metal trunking. Lines with no anti-interference requirements on the same path can be laid in the same metal trunking. The total section (including the outer sheath) of wires or cables in the trunking shall not exceed 20% of the section in the trunking, and the number of current carrying wires shall not exceed 30. For control, signal or similar lines, the total section of wires or cables shall exceed 50% of the section in the trunking and the lower limit of the number of wires or cables.
Metal trunking shall be reliably grounded or connected to zero, but shall not be used as the grounding conductor of equipment.
The lines led out from the metal trunking can be wired by metal pipes, hard plastic pipes, semi hard plastic pipes, metal hoses or cables. Wires or cables shall not be damaged at the outgoing part.
The specification, size, assembly method and installation position of the cable tray metal trunking shall be in accordance with the design regulations and the requirements of the construction drawings. The bottom of the cable tray shall be 2.2m and above the ground, the distance between the top and the building floor shall not be less than 300mm, and the distance between the intersection with the beam and other obstacles shall not be less than 50mm.
When the cable tray is laid horizontally, the support spacing should be 1.5-3m. When laying vertically, the distance fixed on the building structure should be less than 2m. The part below 1.8m from the ground should be protected by metal cover plate or enclosed by metal wiring cabinet, and the door should be openable. wait.
As for the question "the bridge and trunking are actually different", have you got a new understanding after reading the above contents? If you need to buy cable tray or trunking products, please follow our website http://www.sddlqj.cn Contact us for purchasing.