Fireproof cable trays should maintain horizontal deviations ≤2 mm/m and vertical deviations ≤3 mm/m, with tray width and thickness selected to support full cable load without deformation.Dimen...
Horizontal and Vertical Alignment: Fireproof cable trays must be installed level and plumb. The horizontal deviation should not exceed 2 mm per meter, and the vertical deviation should not exceed 3 mm per meter to ensure structural stability and proper cable support . Tray Width and Thickness: The tray width and thickness must be chosen based on the number and weight of cables, ensuring sufficient mechanical strength to prevent bending or failure under full load . Rung and Mesh Spacing: For wire-mesh or basket-type fireproof trays, rung spacing typically ranges from 150 mm to 230 mm (6–9 inches) to maintain cable support and prevent sagging . Splice and Connection Tolerances: Splice plates and bolts must be used at tray joints to maintain alignment and electrical continuity. Sharp edges or debris must be removed to prevent cable damage .
Fireproof cable trays are tested according to standards such as DIN 4102-12, which requires the tray system to withstand temperatures up to 1000 °C for 30, 60, or 90 minutes in a test oven at least 3 m long . Maintaining dimensional tolerances is critical to ensure that the tray performs as tested under fire conditions.
The total load supported by the cable tray, uniformly distributed. This will be the combined weight of all of the cables or tray contents,
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