Thickness of cable tray crossbars

Cable tray crossbar supports typically have a thickness ranging from 1.5 mm to 3 mm for medium-duty applications, with heavier-duty trays requiring 3 mm or more, depending on load and span.Material and Standard ConsiderationsCable tray crossbars are usually made of steel, stainless steel, or aluminum, often with galvanization or other corrosion-resistant coatings to withstand environmental conditions . The thickness of the crossbar is determined by the tray type, load capacity, and span between supports. Medium-duty trays (e.g., MKS 35 or RS 60) often use crossbars around 1.5–2 mm thick, while heavy-duty trays may require 2.5–3 mm or more .Load and Span FactorsThe mechanical load of the cables, including weight and potential dynamic forces, directly affects the required crossbar thickness. Standards such as DIN EN 61537 and manufacturer guidelines specify maximum permissible cable weights and support spacing. For example, crossbars should be supported near joints and bends, typically within 150 mm of a joint, to prevent sagging or deformation . Longer spans or higher loads necessitate thicker crossbars or additional support brackets.Installation GuidelinesSpacing: Crossbars are usually spaced 150–230 mm apart for instrumentation and control cables, with closer spacing for heavier or larger cables .Support Elements: Crossbars are mounted on wall brackets, cantilever brackets, or ceiling suspensions, which must be compatible with the crossbar thickness and tray type .Environmental Considerations: For outdoor or corrosive environments, thicker or coated crossbars may be required to maintain structural integrity over time .Practical RecommendationWhen selecting crossbar thickness, consider:Tray type and side height (e.g., 35 mm, 60 mm)Cable load and type (power, instrumentation, control)Span between supportsEnvironmental exposure (indoor, outdoor, corrosive) For most standard installations, 1.5–2 mm steel crossbars suffice for medium-duty trays, while 3 mm or more is recommended for heavy-duty or long-span applications . Always consult the manufacturer's technical guide to ensure compliance with load ratings and safety standards.