Professional Cable Tray Manufacturer

Shandong Hongfeng Electric Group Co., Ltd.

The products can be widely used in construction, energy, power, plant.

The latest national standard for cable trays, safety loads for different heights

Release time:

2023-12-06

The latest national standard of cable tray includes many contents, including the content of load-bearing standard of cable tray, that is, the content of safety load.

The latest national standard of cable tray includes many contents, including the content of load-bearing standard of cable tray, that is, the content of safety load.
For example, the height of the bridge is different, the corresponding safety load is also different.
The following is an introduction to the relevant content.
1. The connecting plate should be used to connect the straight segment of the cable tray, the outer connecting plate is necessary, the inner connecting plate can be selected, and then tightened with washers, spring washers and nuts, and there should be no tight and flat gap at the butt joint.
When the trays and ladders laid by the cable tray are of non-galvanized material, the two ends of the connecting plate in the middle of the two bridges shall be connected by copper core wires with a cross-sectional area > = 4 square meters.
2. The name of the structural feature of the long-span tray type bridge in the national standard 2000 is bilateral perforated tray, code-named DP.
In the 2000 national standard, the name of the structural feature of long-span ladder bridge is bilateral ladder frame, and the code is DT.
2000 the national standard stipulates that the span of the bridge is the distance between the midpoints of two adjacent supports, and more than 3 meters is a long span.
In the 2000 national bridge frame standard, the code name of steel material is G and the code name of aluminum material is L.
3. Bridge load when the cable tray is installed horizontally, the distance between supports and hangers should be selected according to the load specification, and the best distance should not be more than 2 meters.
The distance between the cable bridge support and the hanger should also be set with reference to the description of its product performance parameters.
Considering the safety load, the cable tray is generally prohibited as a pedestrian passage or station platform to avoid safety accidents. If the cable tray must be used as the above device, relevant reinforcement measures must be adopted to ensure it.
4. Bridge height cable tray should fill in: name + model + arm length + arm height when compiling the pick-up list of ground support.
For example, "flat steel outer bracket JY-ZJ,L=200,H=50", which indicates the plane length of the bracket 200mm, and the distance between the bracket and the ground is 50mm, which is suitable for the installation of 200wide bridge.
For the cable tray with high load whose span is larger than the standard length or considering the effect of outdoor wind and snow, it is necessary to use enhanced side plates or enhance the height of the bridge, or corrugated cable tray to ensure its safe load.
5. Under the condition of safe working load, the ratio of the deflection of the cable tray to the span of its support and hanger should not be greater than 1x200, otherwise it will lead to bending deformation or rupture of the cable tray and safety accidents.
The specifications of various bends and accessories of the cable tray shall conform to the engineering layout conditions and match with the straight through of the bridge tray.
The specification and quantity of cable tray supports and hangers should be selected according to the technical configuration of bridge specifications, layers and spans, and meet the requirements of safety load.

Keywords：

Bridge composition, trough tray ladder bridge structure standard

What are the standard requirements of the cable tray bracket, and the specifications, width and height of the commonly used cable tray bracket

Bridge composition, trough tray ladder bridge structure standard

What are the standard requirements of the cable tray bracket, and the specifications, width and height of the commonly used cable tray bracket