Tray-type Spray-coated Cable Tray

Tray-type cable trays are cable laying support systems with trays as the main structure and fire-retardant functions. They are mainly used for overhead or wall-mounted laying of power and communication cables. Their core characteristic is that, through structural design and the combination of fire-resistant materials, they can effectively delay the spread of flames and block high-temperature conduction in the event of a fire, ensuring that cable lines maintain normal operation for a specified time. They also possess the basic advantages of tray-type cable trays: excellent heat dissipation, light weight, and convenient installation.

The tray-type fireproof cable tray consists of a tray body, a fire-resistant reinforcement layer, connectors, and an optional cover plate. Its specific structural features are as follows:

• Pallet body : Made of cold-rolled steel plate, galvanized steel plate or aluminum alloy by stamping, with a flat bottom (can be equipped with heat dissipation holes), and vertical or slightly folded edges on the sides. The overall structure is a "U" shaped pallet (different from fully enclosed trough-type cable trays and grid-type ladder-type cable trays), which combines load-bearing capacity and heat dissipation.
• Fire-resistant reinforcement layer : Fire protection is achieved in two ways: ① The main surface is sprayed with flame-retardant fire-retardant coating (such as intumescent fire-retardant coating, which expands when exposed to fire to form a heat-insulating char layer); ② The inner lining is made of fire-resistant materials (such as rock wool, aluminum silicate wool, fireproof board, etc.) to improve the overall heat insulation performance.
• Connectors : including straight, bend, tee, cross, etc., made of galvanized or fire-retardant metal parts to ensure that the cable tray system is firmly connected and has continuous fire resistance.

The core value of tray-type fireproof cable trays lies in their fire resistance, flame retardancy, and fire-resistant stability , specifically manifested in:

• Fire protection principle : The cable is protected by the flame-retardant and heat-insulating coating (inhibiting combustion and reducing heat conduction) and the high-temperature barrier of the inner lining material (delaying flame penetration); at the same time, the overall structure of the cable tray has a certain mechanical strength and is not easily deformed or collapsed in a fire.
• Implementation Standards : Must comply with national standards "Technical Specification for Cable Tray Engineering" (GB/T 17428-2009) and "Technical Standard for Fireproof Sealing Application in Buildings" (GB 51447-2021). Fire resistance performance must be tested by a third party. Common fire resistance ratings are **≥1 hour (applicable to general locations)** and **≥2 hours (applicable to important power circuits, such as fire protection and emergency power supplies)**.
• Additional safety features : Supports grounding (through the cable tray itself or a dedicated grounding terminal), which can effectively prevent static electricity and electric shock, and improve electrical safety.
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Due to their combined fire resistance and heat dissipation advantages, tray-type fireproof cable trays are widely used in locations where cable laying safety requirements are high, including:

• High-rise buildings : such as power shafts and low-voltage shafts in office buildings and residential buildings, as well as cable trays in public areas;
• Public facilities : Subways, airports, hospitals, shopping malls and other densely populated places must ensure power supply for emergency lighting and fire-fighting equipment in the event of a fire;
• Industrial sector : power plants, chemical plants, metallurgical plants and other factories with high temperature and flammability risks, as well as key power facilities such as data centers and energy storage power stations;
• Special environments : Scenarios with specific requirements for fire resistance rating, such as tunnels, civil defense projects, and renovation of ancient buildings (the corresponding fire resistance rating needs to be selected according to the design specifications).

Installation specifications :

1. The spacing between supports needs to be designed according to the load-bearing capacity (horizontal laying ≤ 1.5m, vertical laying ≤ 2m) to ensure that the cable tray does not sag significantly;
2. The cable tray system must be reliably grounded (grounding resistance ≤ 4Ω), and each section of the cable tray should be connected by jumper wires to avoid the risk of static electricity or leakage.
3. Fireproof sealing (such as fireproof rock wool + expanded fireproof sealant) is required at the penetration points of walls and floors to block the spread of flames and smoke.

Routine maintenance :

1. Regularly inspect the fire-retardant coating for damage or peeling, and check the fire-retardant lining material for moisture (especially in humid environments).
2. Check whether the bolts of the connectors are loose, and whether the cable tray is deformed or corroded (galvanized/aluminum alloy materials can reduce the risk of corrosion).
3. Clean the dust and debris inside the cable tray to avoid affecting heat dissipation or causing short circuits.

Compared to traditional trough-type (fully enclosed, poor heat dissipation) and ladder-type (weak fire resistance) cable trays, the core advantage of tray-type fireproof cable trays is:

• Dual advantages of fire resistance and heat dissipation : The tray structure has built-in heat dissipation holes, and when combined with fire-resistant materials, it can meet the complex scenarios of "high fire resistance level + cable heat dissipation requirements".
• Lightweight design : 20%~30% lighter than fully enclosed trough-type cable trays, reducing installation load pressure;
• High versatility : It is compatible with various cables such as power cables, control cables, and communication optical cables, and supports customized specifications to match different engineering needs.

In summary , tray-type fireproof cable trays are key equipment for the safe laying of cables in modern buildings and industrial facilities. Through the dual protection of "structural optimization + fireproof materials", they provide reliable support for the emergency operation of power systems in case of fire, and are the preferred solution that balances safety, economy and practicality.

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