Description of the fire-resistant properties of fire-rated cable trays
May 03,2019
Fire-resistant cable trays are no stranger to us. Let’s take a closer look at the performance characteristics of fire-resistant cable trays:
Fire-resistant cable trays are suitable for laying power cables below 10 kV, as well as control cables, lighting wiring, and other overhead cable trenches and tunnels—both indoors and outdoors. However, many people may not be very familiar with their fire-resistant performance.
The steel frame is primarily manufactured from high-quality cold-rolled sheet metal through mechanical processing, featuring high load-bearing capacity and a long service life. The cross-section of the steel frame is neat and free of burrs or sharp edges; the inside of the slots is smooth and flat, with no sharp protrusions. After machining and forming, the cross-sectional shape is uniform, free of defects such as bending, twisting, cracks, or edge irregularities.
Fire-resistant boards are made from siliceous and calcareous materials as primary raw materials, mixed with a certain proportion of fiber materials, lightweight aggregates, binders, and chemical additives, and then produced using advanced steam-curing technology.
Fire-retardant coatings are highly effective protective products for steel structures. They are formulated using carefully selected polymer synthetic resins as film-forming substances, combined with flame retardants, foaming agents, char-forming agents, and high-temperature refractory materials. Under high-temperature conditions, the coating undergoes a continuous foaming and expanding effect, forming a flexible, sponge-like charred insulation layer. This prevents the underlying steel structure from rapidly softening and deforming under the intense heat of flames, and ensures that its strength does not decline dramatically. The exterior fire-retardant coating should be applied evenly, smoothly, and without any noticeable color variations. The inner layer should be reinforced with fire-rated boards or coated with fire-retardant paint, and it is essential to ensure that the fire-rated boards are securely fastened to the cable tray.
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We primarily manufacture ten major product series, including communication and mining RVVZ-series cables, power cables, control cables, flame-retardant and fire-resistant cables, rubber-sheathed cables, shielded cables, high- and low-voltage insulated overhead conductors, pre-branched cables, mining cables, and various types of bare wires.
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