What do you need to consider when choosing a cable tray outdoors?

1. When the cable network that needs to be shielded from electrical interference or has the requirements of protecting the external (such as: corrosive liquid, flammable dust and other environments), 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. In the public passage or outdoor crossing road section, the bottom of the bottom step should be added with a backing plate or a tray should be 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.

5. Composite bridge (FB) should be selected for large span (>3m).

6. Composite epoxy resin bridge (F) should be used outdoors.

1 General Provisions.

1 1 This chapter is applicable to the new and expanded general industrial and civil building cables, bridge installation and cable laying in the bridge 100 frame with a voltage of 10kV and below.

1 degree 2 cable tray installation and cable laying in the tray shall be constructed in accordance with the approved design documents.

1 3 The pallet (slot) or ladder frame straight section supported by the support, hanging, and bracket is combined, and the curved non-straight section is combined, and the rigid structural system with continuity of the cable is the cable tray.

The metal cable tray and its bracket and the metal cable duct that is introduced or led out must be grounded (PE) or zero (PEN) reliably and must comply with the following requirements:

1. The total length of the metal cable tray and bracket shall be connected to the grounding (PE) or zero (PEN) trunk at no less than 2 places;

2. The two ends of the connecting plate between the non-galvanized cable tray are connected to the copper core grounding wire, and the minimum allowable cross-sectional area of the grounding wire is not less than 4mm2;

3. The two ends of the connecting plate between the galvanized cable tray shall not be connected to the grounding wire, but there shall be no less than 2 connecting fixing bolts with locknuts or washers at both ends of the connecting plate. Genus.

1 5 It is strictly forbidden to have defects such as twisting, armor flattening, sheath fracture and serious scratches on the surface of cable laying.

1 6 If there is a place with fire protection requirements at the cable tray, fire isolation measures should be taken.

Hello dear, thank you for waiting, let me explain to you, 1, the width and height of the bridge according to the following standards and regulations, and should meet the cable true charge rate does not exceed the specified value of the relevant standard specifications, power cable can take 40-50%, control cable can take 50-70%, in addition to leave 10-25% of the formula development margin. 2. All kinds of bends and accessories should meet the engineering layout conditions and match the bridge. 3. 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. I hope you can be satisfied, give a thumbs up and encouragement, thank you!

The type of cable tray mainly depends on the weight of the cable and the use of the environment, etc., because of the fact that things have never been resolved, and the following provides us with some commonly used cable tray types on the market as a reference:

Trough cable tray: A trough cable tray is a hermetically sealed cable tray, box-like shape, used to lay cables.

Ladder cable tray: It looks like a ladder together, and the center is welded with a crossbar to reinforce the support of the front trembling, which makes it light in weight, low cost, extremely strong in bearing capacity, and good in breathable cover.

<> Tray Cable Tray: The tray cable tray is a semi-sealed cable tray, which is very similar to the posture of the trough cable tray, with holes in the bottom for heat dissipation.

The following is a guide to the commonly used standards in the market

The standard is suitable for: trough tray (C), ladder tray (T), tray tray (P) (special standards can be customized by contact).

Thickness: non-standard) national standard).

There are too many, there are a lot of them, depending on the mess you need and the height length is generally 2 meters, which can be spliced, and there are matching connection accessories.

The cable tray used outdoors must meet the following requirements:

1.Corrosion-resistant.

2.No deformation.

3.Light specific gravity.

4.Strong electrical insulation.

5.Excellent fire performance.

6.Bracket installation is simple ** better.

7.Long service life.

For example: fireproof cable tray, aluminum alloy tray, stainless steel tray, sprayed cable tray, hot-dip galvanized cable tray.

Choose according to environmental disadvantages: It is recommended to use hot-dip galvanized cable trays, aluminum alloy trays, and stainless steel trays for outdoor installation.

The outdoor must be made of anti-corrosion material bridge, with FRP or hot-dip galvanized for serious corrosion, and ordinary spraying if there is no corrosion.

The minimum allowable plate thickness of the cable tray: when the width of the cable tray b 100mm, the plate thickness; 100 b at 150 hours ; 150 b 400 hours ; 400 b 800 hours ; b 800 hours.

The cover can be selected with a corresponding lower grade.

You can check the national standard GB T 23639-2009 energy-saving and corrosion-resistant steel cable tray JB T 10216-2000 Cable tray for electronic control and distribution JB T 6743-1993 Indoor and outdoor steel cable tray anti-corrosion environment Technical requirements MT 961-2005 FRP cable tray for underground coal mine QB T 1453-2003 cable tray.

First, the cable tray structure type selection:

1.In the engineering design documents, the cable tray is usually called "tray", and the specific structural characteristics are not pointed out, and the cable tray of different types and different materials is quite different, and the confusion of the structure type will bring problems in heat dissipation and mechanical protection on the work site.

2.Therefore, in the design stage, designers should be required to reasonably select the structural characteristics of the cable tray according to the characteristics of the engineering environment and technical requirements, and clearly express them in the model annotation and material table of the floor plan.

Second, the cable tray material selection:

1.The material of the cable tray is another common problem in the engineering design of the cable tray. According to the division of materials, cable trays are mainly made of steel, glass fiber reinforced plastic and aluminum alloy.

FRP cable tray is characterized by light weight, and the specific gravity is only 1 4 of carbon steel; It has good water resistance and corrosion resistance, and is suitable for chemical plants.

2.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=, according to the weight, the ratio of aluminum to steel is about 1:3.

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.

The quality of the cable tray is also an important factor when we choose it, and the quality of the cable tray will cause great losses in the later use, so special attention is needed. The quality of the cable tray can pay more attention to the following requirements.

1.The raw materials of the cable tray **, when choosing the cable tray, the manufacturer can take us to see how the raw materials for the cable tray are made, and whether there is a special purchase channel.

2.There are many kinds of surface treatment of cable tray, and whether the surface treatment of the manufacturer is in accordance with the relevant standards during production is also necessary to pay special attention to, so that the manufacturer can provide relevant information to prove it.

3.Whether the manufacturer cuts corners at the time of production, you need to carefully check the order form when receiving the goods, and check it clearly on the spot so that you don't need to trouble in the future.

4.There are also many installation accessories for cable trays, some of which are distributed by the manufacturer, and this needs to be explained clearly to the manufacturer in advance, which ones are paid and which ones are sent.

Of course, you should choose some excellent quality! You can't use too cheap defective products, the quality cannot be guaranteed! Centennial plan, quality first!

The cable tray is divided into trough type, tray type, ladder type, grid type and other structures, which are composed of brackets, brackets and installation accessories. The bridge frame in the building can be erected independently, and can also be attached to various buildings (structures) and pipe gallery supports, which should reflect the characteristics of simple structure, beautiful appearance, flexible configuration and convenient maintenance, and all parts need to be galvanized, and installed in the open air bridge outside the building.

Cable tray purchasing guide: For cable tray systems located in vibration places, spring washers should be installed at the bolt joints including the grounding part. For metal bridges that require fire protection, a refractory coating should be applied to the outer surface of the metal components in accordance with the relevant national specifications.

The metal bridge system should have a reliable electrical connection and grounding, and the FRP bridge should be used to lay a special grounding wire along the full length of the bridge. Pallets should be used in places that need to be protected by high temperatures, corrosive liquids or oil splashes. The ladder frame and tray composed of cable tray can be made of FRP that meets the flame retardancy of engineering conditions.

When the technical and economic synthesis is better, aluminum alloy cable tray can be used.

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