Cable trayProduct Categories:
Transmission and distribution equipment / cable tray
Selection of the type and variety of cable trays and accessories I. Selection of the type and variety of cable trays 1. When the cable network that needs to be shielded from electrical interference or is protected from external influences (such as corrosive fluid, flammable dust and other environments) is required , Trough composite anti-corrosion shielded cable bridge (with cover) should be used. 2. For severe corrosive environment, (F) composite epoxy resin anti-corrosion and flame-retardant cable bridge, support arm and bracket should also use the same material to improve the bridge. And the service life of the accessories, the cable tray should be covered with a cover in an environment that is easy to accumulate dust and other areas that need to be covered or outdoor places. 3. In addition to the above situations, tray type, trough type, step type, glass anticorrosive and flame retardant cable tray or steel ordinary bridge tray can be selected according to the site and environment and technical requirements. Covers should be added in the environment or outdoor places where it is easy to accumulate dust and other areas to be covered. 4. Cross the road section in the public passage or outdoors. The bottom of the bottom rung should be added with pads or trays in this section. When the long span spans the public passage, the load capacity of the bridge can be increased or the frame can be selected according to user requirements. 5. For large spans (> 3m), composite bridges should be used. 6. Use composite epoxy tree finger bridges outdoors.
Second, specification selection 1. The width and height of the bridge are selected according to the following table, and should meet the cable filling rate not exceeding the value specified in the relevant standards. Power cables can be 40-50%, and control cables 50-70%. Allow 10-25% of the process development margin. 2. The specifications of various bends and accessories should meet the project 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 floors, and the span. And should meet the load requirements. 4. For the selection of the cross-sectional area of the bridge, see the rated current or setting value of the maximum automatic overcurrent protection of any line in the cable network on the bridge (A) The minimum allowable cross-section of the bridge (mm2) 0-60 129 61- 100 258 101-200 452 201-400 645 401-600 968
Third, the configuration of support, hanger 1, indoor support, hanging short span is generally taken 1.5-3m. The mid-span of outdoor columns is generally 6m. 2. The support and hanger configuration for non-linear sections follows the following principles. When the width of the bridge is less than 300mm, a support and hanger should be set on the side of the straight section 300-600mm away from the non-straight section and the straight line. When the bridge width is> 300mm, in addition to the following conditions, a support and hanger should be added in the middle of the non-linear section. 3. The center distance between layers is 200, 250, 300, 350mm when the bridge is installed in multiple layers. 4. The linear section of the bridge should be reserved with an expansion joint of 20-30mm (metal bridge) every 50m.
Fourth, the fire protection section of the bridge must be made of steel or non-combustible, flame-retardant materials. The BAQJ series cable trays produced by our company include fireproof bridge trays . V. Grounding 1. The bridge system should have reliable electrical connection and ground (only for metal bridges). 2. When it is allowed to use the bridge system to form the ground trunk circuit, the following requirements shall be met. The connection resistance between the ends of the bridge should not be greater than 0.00033 ohms, and the grounding hole should be cleared of the insulating coating. In 1KV and below neutral point direct grounding systems, the grounding of the power receiving equipment is connected to the neutral grounding of the system. When installed to cut off the power supply, the metal cross-section area of the bridge in the length direction should not be less than the specified value. 3. When laying another grounding trunk along the entire length of the bridge, each section (including non-linear sections) of the bridge should be reliably connected to the grounding trunk. 4. For vibration places, a spring coil should be installed at the connection of the grounding part.
- company name:
- Yangzhong Huanyu Fluoroplastic Electric Appliance Co., Ltd.
- Cao Jianguo
- contact address:
- No. 36 South Huancheng Road, Yangzhong, Zhenjiang
- Postal code: