What are the considerations for the selection of cable trays?

As a supporting project of wiring engineering, the cable tray lacks the versatility of many manufacturers' specifications and products, therefore, the design and selection process should be based on the type, quantity, and reasonable selection of the applicable tray according to the weak current system. According to the on-site environment and technical requirements, tray type, ceremonial type, stepped type, glass anti-corrosion immovable cable tray or steel ordinary cable tray can be selected. In the environment or outdoor places that are prone to dust accumulation and other things that need to be shaded, it is advisable to add covering.

In public passageways or outdoor crossings of road sections, the bottom chamber of the ground floor rungs are padded or pallets are used in the section. When the large span spans the public passage, the load capacity of the bridge can be increased according to the user's requirements or the row frame can be selected. The installation of the cable tray and the laying of cables in the tray shall be constructed in accordance with the approved design documents.

Trays (slots) or ladder frames supported by supports, hangers, brackets....

1.Whether the cable tray manufacturer has complete qualifications and whether to provide follow-up services.

2.Determine the width of the tray, the number of layers, the type and spacing of the support points, and the distribution of cables on each layer of tray.

3.Calculate the uniform load (kn m2) of each layer of cable, and preliminarily determine the model and specification of the tray.

4.The strength of the bridge is calculated according to the maximum total average load value of the cable.

Are you a sign of rust soon after the bridge is installed? How to choose the material of the bridge? If you don't choose well, it will rust soon when you install it, and the bridge materials on the market are:

Galvanized, sprayed, fireproof, stainless steel, aluminum alloy, hot-dip galvanized, FRP and so on. The above is also our most common material Having said so much is it not a little dizzy, remember the following points 1, in general, in an ordinary indoor environment, galvanizing or electrostatic spraying is used, and electrostatic spraying is a little better than galvanizing. 2, places with strong corrosive environment, hot-dip galvanizing, stainless steel, FRP, hot-dip galvanizing are widely used, recommended 3, places with fire protection requirements, directly choose fireproof bridge 4, need anti-electromagnetic interference, anti-shielding interference places, such as network computer room, the first choice of aluminum alloy bridge 5, ** dangerous places, construction can not be fired, FRP bridge is your best choice, or do not understand?

To sum it up, look at this picture.

Place the junction box and bracket according to the standard position, and then place the bridge and the outlet, and add various accessories as needed, and the upward bridge does not have to stand too long, otherwise it is easy to be broken. After the connection is completed, adjust the bracket and plastic cover to make the cable outlet to the appropriate height. The position is correct, the fixation is firm, and the direction is reasonable.

The allowable deviation of the straightness and verticality of the horizontal or vertical laying part of the bridge does not exceed 5mm. In order to prevent the mortar from entering, special glue is smeared around the joints, and the lids of each junction box and outlet box are tightened, and tied with iron wire, and plastic is added to the end. When pouring concrete, a special person will be set up to take care of it, and deal with problems in time.

1. When the cable network that needs to be shielded from electrical interference or has the requirement of protecting the external (such as corrosive liquids, combustible dust, etc.), the (FB) trough composite anti-corrosion shielded cable tray (with cover) should be selected.

2. In strong corrosive environments, (F) composite epoxy resin anti-corrosion and flame-retardant cable tray should be used. The same material should be used for the bracket and bracket to improve the service life of the tray and accessories, and the cable tray. In the environment or outdoor places that are prone to dust accumulation and other needs to be covered, it is advisable to add a cover.

3. In addition to the above conditions, tray type, trough type, stepped type, glass anti-corrosion flame retardant cable tray or steel ordinary cable tray can be selected according to the environmental and technical requirements of the site. In the environment or outdoor places that are prone to dust accumulation and other needs to be covered, it is advisable to add a cover.

4. Cross the road section in the public passage or outdoors, at the bottom.

Which cable tray option do I think? I don't know about this, so I'm sorry.

According to the division of materials, the cable tray mainly has steel, source FRP and aluminum alloy. FRP cable tray is characterized by light weight, and the specific gravity is only 1 4 of carbon steelIt has good water resistance and corrosion resistance, and is suitable for chemical plants. The oxygen index of non-flammable, non-flammable FRP cable tray is 32.

Long service life, the general design life is 20 years, but ** is 3 times that of steel cable tray. The superiority of construction lies in the convenience of cutting, flexible assembly, and no need to start fire for installation, which is particularly significant for the chemical plant project with a dangerous environment and a tight construction period, because in the most dangerous environment, the chemical plant must stop production when the project is fired, and the economic benefits will be affected. The weight of the aluminum alloy cable tray is also very light, due to the different specific gravity of aluminum and steel (al=, fe=, calculated by weight, the ratio of aluminum to steel is about 1:

3。The dimensions and load characteristics of the aluminum alloy cable tray are basically similar to those of the steel cable tray. In terms of cost, the cost of aluminum alloy cable tray is 20% higher than that of galvanized steel cable tray, and the service life is more than 5 times that of steel cable tray.

Steel tray can use surface treatment technology, such as galvanizing, spraying, etc., the current cable tray on the market is more used Changpeng galvanized bridge, stainless steel bridge, spraying bridge.

To select the tray according to the diameter and number of cables, there will be detailed notes on the general construction drawings.

This is true, but it still depends on the specific situation to choose, so this is also a big problem, and it is also good to make your own choice according to such a problem.

There are a lot of materials, there are different materials, and there are ** and so on that need to be chosen.