Professional Cable Tray Manufacturer

Shandong Hongfeng Electric Group Co., Ltd.

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

What are the specifications and standards for cable tray brackets and commonly used bridge span

Release time:

2023-12-06

It is necessary to comply with many standards and specifications when installing the pre-fixed device

It is necessary to comply with many standards and specifications when installing the pre-fixed device bracket of the cable tray, and the commonly used span of the bridge is 2m, 3m, 4m and 6m.
The relevant contents are introduced as follows: 1. The matching connecting bolts of the bridge bracket should be ordered according to the specific requirements and types. The surface treatment of the cable tray bracket mainly has two processes: spray painting and galvanizing. Galvanizing process can be used in heavy corrosion environment.
When the round steel or angle steel is used as the fixed hanger for the laying of the cable tray, the hanger length of the same horizontal line should be the same, the wire length of the round hanger should be the same, and the length of the hanger protruding from the cross pole bracket should be the same, and should not exceed 50mm.
2. Bridge Standard 2000 the name of the structural feature of long-span tray type bridge in the National Bridge Standard is bilateral perforated tray, code name is 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.
The 2000 national standard is applicable to the cable bridges of indoor and outdoor industrial and civil buildings, high and low voltage power transmission and distribution projects.
The relevant national standards cited are GB/T 4208-1993 shell protection grade (IP code).
3. When the bridge span cable tray is installed indoors, the short span of the bridge support hanger is generally 1.5m~2m, and the long span can be 3m, 4m or 6m.
When the cable bridge is installed outdoors, the distance between the outdoor posts is generally 6m.
In the case of safe working load, compared with the span of its support and hanger, the ratio of the deflection of the cable tray should not be greater than 200, otherwise it will lead to bending deformation or rupture of the cable tray and safety accidents.
4. Length of cable tray when round steel such as screw is used for laying cable tray, the diameter of profile should not be less than = 10mm, and the length of screw should not be too long, otherwise it will easily cause sloshing and affect the stability of cable tray laying.
When compiling the column lifting list of cable tray, it should be filled in: name + model + column length + classification.
Such as "hot-dip galvanized channel steel column, specification JY-H103-1000 (type I)", "hot-dip galvanized angle steel column, specification JY-H104-800( type II)".

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