What is the minimum size of a cable tray? What is the maximum specification?

At present, the bridge is widely used in the construction industry, mainly trough bridge, galvanized bridge, step bridge, stainless steel bridge, the bridge model is, the conventional production length of cable tray: 4000mm-9000mm

Specifications for cable tray production:

If you help, give it a good review.

Hello. The size of the specifications does not affect the production. It's just that the smaller the size, the harder it is to do. There may be some spreads.

You can make it according to your own size.

1. The specifications and models should be calculated by looking at the design drawings to calculate the specifications and quantities of the bridge.

2. If there is no drawing or no marking, it depends on the total number of cables in the bridge.

3. The cross-sectional area should not exceed 40% of the cross-section of the bridge.

4. Load calculation: calculate the weight of the cable per unit length on the longitudinal section of the main trunk of the cable tray.

First of all, Xiangtai Electric reminds that the size of the bridge is changed according to the different ways and use environments, such as the cable is laid without spacing (the cable can only be tiled in the bridge), calculate the total cross-sectional area of the cable, and then according to the content of "04DX101-1 Common Data for Building Electrical", the cross-sectional area of the power cable shall not be greater than 40% of the cross-sectional area of the bridge. Therefore, divide the total cross-sectional area of the cable by the required cross-sectional area of the tray. Other specific comparisons are as follows:

The cable tray is stamped with thin steel plates. Its carrying capacity has a certain limit.

Otherwise, serious deformation will occur due to overloading of the bridge. It affects the aesthetics of the tray and the safe operation of the cable.

Usually the load-bearing capacity of the cable tray is expressed by the load characteristic curve of the cable tray.

As can be seen from the load curve diagram, the size of the load capacity of the cable tray is a quantity related to the size of the cable tray and the support distance.

Corresponds to the same support distance and the amount of flexural and convex deformation. The bearing capacity of the bridge with large side height is large, and the bearing capacity of the bridge with small height is small.

In addition, when the load capacity is the same, for the same specification of cable tray. The amount of bending deformation is smaller than that of those with a small support distance.

In general, the cable tray is installed with a set of support frames at regular intervals. In the design calculation, if the actual load of the cable tray is expressed by the total g:

Then: g total = n1g1 n2g2 n3g3 ......

We all know that there are so many specifications and sizes of the bridge, there are *100, or even larger, how to choose the size of the bridge, it is not good to buy a large one, and it is not good to buy a small one, don't worry.

As for how to choose the size of the bridge, in fact, the first part of the bridge standard mentions that if the bridge is used to install power cables or lighting cables, pay attention to the power cable and lighting cable, the filling rate in the slot should not exceed 50%, and if the bridge is used to install weak current or control cables, the filling rate in the slot should not exceed 70%, and 10% to 25% of the project development margin should be reserved.

<> As for the load-bearing capacity of the bridge specifications, please see this formula.

Commonly used specifications and size tables for bridges.

The number of cables, cable diameter, and cable spacing determine the type, specification, arm length, strut length, spacing, tray width, and number of layers of the cable tray. The installation conditions determine the fixing method of the bridge, and choose suspended, upright, sidewall or hybrid. Connectors and connectors are usually set in sets**, and the appropriate cover is selected for bending according to the bridge structure.

The spacing, installation method, model specification, elevation and other bridge support points of pillars, pillars or non-standard pillars and skeletons can be listed and illustrated on the plane, or they can be represented by cross-sectional drawings, single-line drawings or large sample drawings with different sections. Generally speaking, the lead out of most cables can be installed on the shelf perpendicular to the vertical bend plate, and the lead out of a small number of cables can be indicated with a guide plate or conduit.

The common specifications of cable tray are *100, etc., and the common specifications of cable tray are different for different structural types. According to the type of structure, cable tray is divided into trough cable tray, tray cable and ladder cable tray. The following is an introduction to the common specifications of these bridges.

1. List of specifications and models of trough cable tray.

Specification 1: 50*50 Width 50mm Height 50mm Specification 2: 100*50 Width 100mm Height 50mm Specification 3:

150*50 Width 150mm Height 50mm Specification 4: 200*50 Width 200mm Height 50mm Specification 5: 150*100 Width 150mm Height 100mm Specification 6:

200*100 Width 200mm Height 100mm Specification 7: 300*100 Width 300mm Height 100mm Specification 8: 400*100 Width 400mm Height 100mm Specification 9:

500*100 Width: 500mm Height: 100mmSpecification: 10: 600*100, Width: 600mm, Height: 100mm<>

2. List of specifications and models of tray cable tray.

Specification 1: 200*60 Width 200mm Height 60mm Specification 2: 200*100 Width 200mm Height 100mm Specification 3:

200*150 Width: 200mm Height: 150mm, Specification: 4: 300*60, Width: 300mm, Height: 60mm, Specification: 5: 300*100, Width: 300mm, Height: 100mm, Specification 6:

300*150 Width 300mm Height 150mm Specification 7: 400*60 Width 400mm Height 60mm Specification 8: 400*100 Width 400mm Height 100mm Specification 9:

400*150 Width 400mm Height 150mm <>

3. List of specifications and models of ladder cable tray.

Specification 1: 200*60 Width 200mm Height 60mm Specification 2: 200*100 Width 200mm Height 100mm Specification 3:

200*150 Width: 200mm Height: 150mm, Specification: 4: 300*60, Width: 300mm, Height: 60mm, Specification: 5: 300*100, Width: 300mm, Height: 100mm, Specification 6:

300*150 Width 300mm Height 150mm Specification 7: 400*60 Width 400mm Height 60mm Specification 8: 400*100 Width 400mm Height 100mm Specification 9:

400*150 Width 400mm Height 150mm <>

The above are the common specifications of trough cable tray, tray cable tray and ladder cable tray.

The width and height of the bridge are selected according to the following table, and should meet the requirements of the cable true charge rate does not exceed the specified value of the relevant standard specifications, the power cable can take 40-50%, the control cable can take 50-70%, and the need to leave 10-25% of the formula development margin. All kinds of bends and accessories should meet the engineering layout conditions and match the bridge. The selection of support and hanger specifications should be configured according to the specifications of the bridge, the number of layers, the span and other conditions.

and should meet the requirements of the load.

1. Determine environmental conditionsThere are generally three kinds of environmental conditions: corrosive environment, normal environment, and special environment. 2. According to the direction of most cables, you can walk along the columns, beams and floors indoors, and along the process pipeline as much as possible outdoors.

3. Calculate the load: calculate the weight q and total load gg total = N1Q1 + N2Q2 ...... of the unit length of the cable cable on the cable tray cross-sectionIn the nnqn formula: q1·q2·q3......qn is the unit weight of each cable (kg m) n1·n2·n3......nn is the total number of the same cable g

1. Cascade cable tray.

CQ1-T cascade cable tray is designed according to relevant data at home and abroad. It has the advantages of light weight, low cost, unique shape, easy installation, heat dissipation and good ventilation. It is suitable for the laying of cables with large diameters, and is suitable for the laying of high and low voltage power cables.

2. Tray cable tray.

Tray cable tray is one of the most widely used in petroleum, chemical industry, light industry, telecommunications, etc. It has the advantages of light weight, large load, beautiful shape, simple structure and easy installation. It is suitable for the installation of power cables and the laying of control cables.

3. Trough cable tray.

A trough cable tray is a fully enclosed cable tray. It is most suitable for laying computer cables, communication cables, thermocouple cables, and other control cables for highly sensitive systems. It has a good effect on the shielding interference of control cables and the protection of environmental cables in heavy corrosion.

The advantages and disadvantages of cascade, tray and trough cable trays: the cascade type merge tray has good ventilation performance, and is not dustproof and interference-proof. Trough and tray cable tray have dustproof and anti-interference performance.

4. Large-span cable tray.

At present, the large-span cable tray is generally assembled from pultruded FRP profiles, which is suitable for power cables, control cables, lighting cables and accessories. Compared with the iron bridge, it has the advantages of long service life (the general design life is 20 years), easy installation and low cost (the specific gravity is only 1 4 of carbon steel, no fire is required during construction, and the length of a single bridge can reach 8 meters, or even longer), easy cutting, no maintenance and so on.

5. Combined cable tray.

Combined cable tray is a new type of cable tray and is the second generation product in the cable tray series. It is suitable for the laying of various projects, various units and various cables, and it has the characteristics of simple structure, flexible configuration, convenient installation and novel form.

Generally, the minimum specification of the cable tray, the minimum width is more than 200mm, the height is more than 80mm, and the maximum width of the trough, ladder and tray tray can be 1200mm.

The width of the trunking is less than 200mm, and the minimum width of the metal trunking is 50mm, and the height is 25mm.

Usually the models of cable tray are divided into: trough type, tray type, ladder type.

The different materials of the cable tray are divided into: galvanized tray, stainless steel 304 tray, aluminum alloy 1060 tray.

The surface treatment process is divided into: fireproof baking paint, electrostatic spraying, hot-dip galvanizing (hot-dip galvanizing) Common specifications are: (width * height * thickness is: national standard thickness).

300mm*100mm*

400mm*100mm*

500mm*100mm*

600mm*200mm*

800mm*200mm*

1000mm*150mm*

1200mm*200mm*, etc.

Hope it helps, thank you!