Dimensions (Width × Height, unit: mm): (1) Height 50 Series: 100×50, 150×50, 200×50, 300×50, 400×50 (2) Height 100 Series: 100×100, 150×100, 200×100, 300×100, 400×100, 500×100, 600×100, 800×100 (3) Height 150 Series: 200×150, 300×150, 400×150, 500×150, 600×150, 800×150, 1000×150 (4) Height 200 Series: 300×200, 400×200, 500×200, 600×200, 800×200, 1000×200, 1200×200 (5) Extra‑long Span / Special Widened Cable Tray for Power Plants: 1000×100, 1000×150, 1000×200, 1200×200 Plate Thickness (unit: mm): 1.0/1.2/1.5/2.0/2.5/3.0/3.5 Ⅰ. Product definition The product is defined as a fire-resistant ladder-type cable tray, primarily consisting of Q235 carbon steel double-sided longitudinal beams and a welded ladder structure with hollow rungs. After molding, it undergoes hot-dip galvanizing/electro-galvanizing for corrosion protection and is then sprayed with an intumescent fire-resistant coating. It comes with matching fire-resistant covers and a full set of fire-resistant accessories, balancing the dual functions of efficient heat dissipation for high-current cables and fire resistance for firefighting. It is specifically designed for wiring projects with fire protection requirements, primarily involving high-voltage power cables. II. Two Major Product Process Types 1. Conventional Coating Type Ladder Frame Forming: Steel plate bending and edge rolling, ladder rung stamping and full welding, with ladder rung spacing of 150/200/300mm; Base Anti-corrosion: Hot-dip galvanizing treatment, with a zinc coating thickness of ≥65μm, providing a rust-proof base; Fire-resistant Spray Coating: Overall spraying of intumescent fire-resistant coating, followed by drying and curing; F60 fire-resistant dry film thickness ≥0.8mm; F90/F120 dry film thickness ≥1.2~1.5mm; Fire-resistant Principle: Upon exposure to fire at 200/300℃, it expands 5/10 times, forming a honeycomb-like dense carbonized thermal insulation layer, which isolates high temperatures and protects the internal cables from power interruption within a specified time period. 2. Double-layer composite high-fire-resistant model (dedicated for tunnels/shafts) features side panels made of double-layer steel plates, with the interlayer filled with aluminum silicate fireproof insulation cotton. This significantly enhances the heat insulation performance, achieving a fire resistance limit of up to 90/120 minutes, making it suitable for enclosed and high-fire-resistance scenarios. III. The entire set of supporting fire-resistant accessories undergoes unified fire-resistant treatment, with no fire-resistant shortcomings: 1. Straight-through accessories: fire-resistant connectors, fire-resistant bolts, and grounding braided jumper wires; 2. Special-shaped parts: 90° horizontal bends, 45° horizontal bends, vertical up-and-down bends, tees, crosses, and reducers; 3. Functional parts: fire-resistant cover plates, metal divider plates, and fire-resistant partition boards; 4. Support system: fire-resistant support arms, fire-resistant columns, and seismic support and hangers (mandatory for shafts and tunnels). IV. Core Advantages 1. Optimal heat dissipation performance, with a hollowed-out and fully transparent structure suitable for high-current heating cables, ensuring sufficient air convection. Compared to fire-resistant trough-type cable trays, the temperature rise is reduced by 10~15℃, perfectly solving the problem of heat accumulation and aging caused by dense laying of high-voltage and large-section cables. 2. It possesses formal fire resistance performance, meeting fire safety inspection standards. The fire-resistant coating forms a thermal insulation barrier when exposed to fire, ensuring that the cable tray does not soften or collapse during a fire. This guarantees continuous power supply to power cables such as fire pumps, smoke exhaust fans, and emergency lighting. A third-party fire safety inspection report can be provided. 3. The hollow structure features light weight, strong load-bearing capacity, and lower cost, using less material than the fire-resistant trough type, and is labor-saving in lifting and transportation. The double-layer crimping + fully welded ladder rungs provide mechanical stability, and the thickened model can support a uniform load of up to 450kg/m, suitable for centralized laying of heavy-duty high-voltage cables. 4. The wiring maintenance is convenient with an open structure, eliminating the need for frequent disassembly of cover plates. The laying, inspection, and addition or removal of cables are visually intuitive, reducing maintenance man-hours in the later stages. 5. Dual protection against corrosion and fire: The bottom layer is hot-dip galvanized for rust prevention, while the outer layer is coated with a fire-resistant material that is resistant to water, oil, mild acids and alkalis. It can be directly used in damp basements and lightly corrosive workshops. Ⅴ. Applicable Scenarios: 1. High-voltage power backbone for fire protection in power plants, substations, and photovoltaic/wind power plants; 2. Industrial plants, underground garages, and distribution rooms, where cables generate high amounts of heat and have fire protection requirements; 3. Power distribution lines in large shopping malls, hospitals, and airports, primarily consisting of power cables; 4. Distribution corridors in mildly corrosive workshops and sewage treatment plants (hot-dip galvanizing + dual fire protection); 5. Power cable zoning in tunnels and utility tunnels (used with supporting fireproof covers). VI. Key Points of Construction and Installation Specifications 1. All cutting, grinding, and drilling sections should be immediately coated with fire-resistant patching compound to restore the complete fire-resistant and heat-insulating layer; 2. Support arms, columns, and connecting bolts should be uniformly equipped with fire-resistant galvanized parts, and the mixed use of ordinary non-fire-resistant accessories is prohibited; 3. Each section of cable tray should be installed with grounding jumper wires, and repeated grounding should be added to shafts and tunnels to ensure overall equipotential continuity; 4. Metal separators must be installed when laying strong and weak electrical cables in the same ladder; fire-resistant covers should be added throughout the entire process for dust, pipe racks, and shafts; 5. For heavy-duty cable trays with a width of over 600mm, support arm support points should be densified to control deflection and deformation under long-term load; 6. High-rise shafts, tunnels, and long-distance fire main lines should be equipped with seismic support hangers according to specifications; 7. Cable trays passing through walls and floor slabs should be equipped with fire-resistant sealing materials to block the spread of flames and smoke.