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How to choose cable tray

Categories: NewsStars: 3StarsVisit: -Release time: 2013-12-09 15:03
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Cable tray purchasing guide and to choose main points:

one, is located in the vibration of bridge system, including the bolt connection of the grounding part, spring washer should be device.

Two, metal bridge for fire prevention, response to the outer surface metal components applied in conformity with the relevant rules of the state of refractory coating.

Third, the metal bridge system, should have a reliable electrical connection and grounding, using FRP bridge, along the bridge length should be the other special grounding wire laying.

Fourth, the selection of cable tray, shall meet the following requirements: the large number of all plastic cable Ming fu, or cable span distance, high voltage cable coil resettlement way, the appropriate use of cable tray.

Fifth, ladder, tray length of line segment more than the following, there should be no less than 20 mm of expansion joint:

1, steel, 30 m.
2, aluminum or glass steel, 15 m.

Six, cable tray shall meet the following requirements:

1, the surface is smooth, no burr.
2, to adapt to the use environment of durable solid.
3, meet the required bearing capacity.
4, if meets the requirement of fire protection engineering.

Seven, selection of cable tray varieties, shall meet the following requirements:

1, in a flammable dust place, or need to be shielded the external electrical interference, no hole tray should be adopted.
2, high temperature, corrosive liquid or oil splash down and places need protection, appropriate USES pallets.
3, must adjust measures to local conditions, assembly available packaged trays.
4, in addition to item (1) ~ (3), appropriate is used the ladder.

Eight, cable tray should be made of metal corrosion resistance, and shall meet the following requirements:

1, large capacity power plant and other places of dense configuration or important loop of steel cable tray, should one-time embalmed with durability, according to the engineering environment and durability requirements, choose suitable anti-corrosion treatment, strong in corrosion environment, appropriate USES hot-dip zinc and so on durability of high anticorrosive processing.
2, the steel arm timbering, light corrosion environment or the importance of loop cable tray, available paint processing.

Nine, the structure of cable tray, should meet the requirements of strength, stiffness and stability, and meets the following requirements:

1, the carrying capacity of the bridge, shall not exceed the bridge first produce permanent deformation, the value of maximum load divided by the safety coefficient is 1.5.
2, ladder, tray to allow relative deflection value under the action of uniformly distributed load, the steel should not be greater than 1/200; The aluminum alloy should not be more than 1/300.
3, steel bracket under the allowed bearing the deflection and the arm length ratio, shoulds not be more than 1/100.

Ten, the strength of the cable tray, should satisfy the cable and its affiliated parts load and the stress of the installation and maintenance requirements, and shall meet the following requirements:

1, may be short on people, according to the additional concentrated load of 900 n.
2, mechanical construction, included in the longitudinal strain, lateral thrust and wheel weight, etc.
3, in the outdoor, accounted for as there may be additional load on ice, snow and high winds.

eleven, cable tray, in addition to the support of single-phase working current is larger than 1000 a cable communication system, appropriate USES steel, in strong corrosive environment, choose other material cable bracket, shall meet the following requirements:

1, in cable trench in the ordinary bridge timbering (arm), the system can choose the rigidity of corrosion resistant materials.
2, ladder of cable tray, tray, can choose meet the engineering conditions of flame retardant glass steel.
3, has a better technical and economic comprehensive, available aluminum alloy cable tray.