Bridge (cable tray) is mainly divided into the following types according to the structure, material and application scenarios, each type has its own unique advantages and areas of application: 

1. Trough bridge (closed bridge) 

Structural features: fully enclosed metal trough (with cover), rectangular or arc-shaped cross-section.

Advantages: 

Dust-proof, moisture-proof, anti-electromagnetic interference (suitable for precision equipment).

Protects cables from mechanical damage and animal chewing.

Disadvantages: Poor heat dissipation, high cost.

Typical applications: 

Data centres, computer rooms (high shielding requirements).

Clean or anti-corrosive environments such as chemical industry and medical treatment.

Outdoor dusty and rainy areas.

2. Ladder bridge 

Structural characteristics: composed of two side beams and transom, similar to a ladder, open structure.

Advantages: 

Excellent heat dissipation performance, suitable for high power cable laying.

Light weight, easy to install, low cost.

Disadvantages: no protection, the cable is susceptible to dust and external forces.

Typical applications: 

Power cables (e.g. substations, factory power lines).

High-rise building shafts, cable trenches and other well-ventilated areas.

3. Tray type bridge 

Structural features: perforated or solid metal tray at the bottom, can be fitted with a cover (semi-closed).

Advantages: 

Both heat dissipation and partial protection, versatility.

Load carrying capacity is better than ladder type bridge.

Disadvantages: Protection is not as good as channel bridge.

Typical applications: 

Commercial building strong and weak power integrated wiring (such as shopping malls, office buildings).

General cable laying in industrial plants. 4.

4. Grid-type bridge (open grid bridge) 

Structural features: metal wire woven into a mesh structure, lightweight design.

Advantages: 

Ultra-high flexibility, supports rapid cable increase and decrease.

Excellent ventilation for troubleshooting and maintenance.

Disadvantages: Unprotected, only suitable for low interference environments.

Typical applications: 

Data centres (e.g. jumper cables between server cabinets).

Communication base station, IT room and other high-frequency alteration scenarios.

5.Large span bridge 

Structure features: reinforced structure, support span up to 6~12 metres (ordinary bridge is 1.5~3 metres).