For the environment with large number of cable trays, it is not easy to fix the cable in the environment of large cable tray, such as the cable tray with high cable cross-section and not easy to be fixed in the environment of large cable tray.
When the low-voltage power cable and control cable share the same tray or ladder for bridge selection, partition boards should be set between each other; proper bending should be provided at the leading up and down points of the tray and ladder branch; flexible connection plate and hinged plate can be selected when it is not convenient to install bend due to space constraints or there is special demand; When the length of the straight section of the steel cable tray exceeds 30 m, and the length of the aluminum alloy or glass fiber reinforced plastic cable tray exceeds 15 m, the elastic joint should be equipped with an elastic plate; the tray and ladder connecting two sections with different width or height can be equipped with a widening or heightening plate.
The tray type bridge is suitable for the environment with more environmental cables, good heat dissipation and light weight of the bridge; the environment with low demand for dust and pollution protection; and the public passage or outdoor cross aisle section.
The trough type cable tray is suitable for shielding the cable circuit disturbed by electrical disturbance in the environment, or needs to protect external influence (such as oil, corrosive liquid, flammable dust, etc.), simple dust accumulation and other environment or field places that need to be concealed. The combined bridge is suitable for the environment, such as large power transformation and distribution station.