Tank type composite anti-corrosion shielded cable tray (with cover) should be used when it is required to shield the cable network of electrical interference or the protection of external (such as corrosive liquid, flammable dust, etc.)
2, strong corrosive environment should use (F) composite epoxy resin anti-corrosion flame retardant cable tray, support arm, bracket should also use the same material to improve the service life of the bridge and accessories, cable bridge in the easy accumulation of dust and other needs Covers should be added to the covered environment or outdoor spaces.
3. In addition to the above, the tray type, trough type, step type, glass anti-corrosion flame retardant cable tray or steel ordinary type bridge can be selected according to the site environment and technical requirements. Covers should be added in environments where it is easy to accumulate and other areas that need to be covered or outdoors.
4. In the public passage or outdoor cross-road section, the bottom of the lower step should be padded or used in this section. When the large span spans the public passage, the load capacity of the bridge can be increased or the rack can be selected according to the requirements of the user.
5, large span (> 3m) should use composite bridge.
6, the outdoor should use the composite epoxy tree finger bridge.
Second, the specification selection
1. The width and height of the bridge are selected according to the following table, and the cable filling rate should 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 remaining 10- 25% of the process development margin.
2. The specifications of various bends and accessories shall conform to the engineering layout conditions and be matched with the bridge.
3. The selection of support and hanger specifications should be configured according to the specifications of the bridge, the number of layers, and the span. And should meet the load requirements.
4. The cross-sectional area of ​​the bridge is selected. See the rated current value or setting value of the maximum automatic over-current protection of any line in the cable network on the table bridge. (A) Minimum cross-section of the bridge (mm2) 0-6012961-100258101- 200452201-400645401-600968
Third, the configuration of the support and hanger
1. The indoor branch and the short span are generally 1.5-3m. The span of the outdoor column is generally 6m.
2. The following principles apply to the support and hanger configuration of non-linear segments. When the width of the bridge is 300mm, in addition to the following conditions, a branch and hanger shall be added in the middle of the non-linear section.
3. When the bridge is multi-layered, the center distance between layers is 200, 250, 300, 350mm.
4. The linear section of the bridge should be reserved for 20-30mm (metal bridge) every 50m.
4. Fire protection requirements The section of the bridge fire prevention must be made of steel or non-combustible and flame retardant materials. The XQJ series cable trays produced by Hongtu Cable Bridge Factory have a series of fireproof bridges.
Five, grounding
1. The bridge system should have a reliable electrical connection and be grounded (only for metal bridges).
2. The following requirements shall be met when the bridge system is allowed to form a grounded trunk circuit.
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