Cable trays are divided into slot type, tray type, ladder type, grid type, and other structures, which are composed of brackets, brackets, and installation accessories. It can be erected independently or attached to various buildings (structures) and pipe rack supports, reflecting the characteristics of simple structure, beautiful appearance, flexible configuration, and convenient maintenance. All parts need to be galvanized and installed on an outdoor bridge outside the building. If it is near the seaside or belongs to a corrosive area, the material must have physical properties such as corrosion resistance, moisture resistance, good adhesion, and high impact strength.
Galvanized wiring duct is divided into: insulated wiring duct, split type wiring duct, mini wiring duct, separated type wiring duct, indoor decoration wiring duct, integrated insulated wiring duct, telephone wiring duct, Japanese telephone wiring duct, open wire wiring duct, circular wiring duct, exhibition partition wiring duct, circular floor wiring duct, flexible circular floor wiring duct, cover type wiring duct, etc. According to different materials, trunking is divided into environmentally friendly PVC trunking, halogen-free PPO trunking, halogen-free PC/ABS trunking, steel aluminum and other metal trunking.
The difference between cable tray and trunking:
Different sizes and specifications: the bridge is relatively large (200 × 100-1200 × 200), the trunking is relatively small. If there are many cables and wires, it is recommended to use a bridge.
Different material thicknesses: According to JGJ16-2008-5.1, metal trunking is also known as a trough type cable tray. It is generally a trough type component formed by bending a whole piece of steel plate with a thickness of 0.4-1.5mm. The conceptual difference from the cable tray is that the height to width ratio is different, the tray frame is shallow and wide, and the metal trunking has a certain depth and closure. However, the bridge is more robust than the trunking, and it is more used for placing cables. Of course, it can also be used for placing wires, usually used in strong current systems.
Different filling rates: According to JGJ16-20088.5.3, the total cross-section of wires and cables in the trunking should not exceed 20% of the cross-section in the trunking, and the current carrying conductors should not exceed 30. The total cross-section of bridges and cables should not exceed 40% of the cross-section. Due to the different installation heights, it is necessary to have a cover plate when the installation height is low. With a cover plate, heat dissipation is not good, and the filling rate is small.
Different sealing properties: The metal trunking is well sealed and does not require support. It can be laid in cable trenches and building interlayer. Some slot bridges are semi open and must be supported by brackets, usually erected indoors or outdoors along the air.
Different intensities: Bridges are mainly used for laying power and control cables, with low trunking strength, and are typically used for laying electric and communication wires and cables, such as network telephones.
Different turning radii: The turning radius of bridges is relatively large, and most of the trunking turns at right angles.
Different spans: large bridge spans, small trunking. Therefore, the fixed supports vary greatly, and the number of supports and hangers varies greatly.
The spacing between supports and hangers is different: according to JGJ16-2008, the trunking is not greater than 2m, and the bridge is not greater than 1.5~3m.
Different installation methods: bridges have special specifications (see CECS31.91 for details), and trunking is not fixed with special specifications.
Cover plate problem: The "Code for Design of Steel Cable Bridge Engineering" defines the bridge as a general term, and the cover plate is an accessory. When it is mentioned that the installation height of the bridge cannot meet the requirements, a cover plate should be added for protection. In other words, the definition of the term bridge does not include the cover plate
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