Cable tray mounting bracket specifications

Cable tray support brackets are designed to securely hold cable trays, with specifications defined by load capacity, material, mounting type, and compliance with standards such as DIN EN 61537.

Types of Support Brackets

1. Cantilever Brackets: Extend horizontally from walls or vertical structures to support cable trays. Commonly used for wall-mounted trays and available in lengths from 100 mm to 300 mm for standard trays, with heavy-duty versions up to 900 mm or more for larger loads .
2. Pendant or Suspended Brackets: Hang from ceilings using threaded rods or suspension systems. Typical lengths range from 1200 mm to 1500 mm, often combined with ceiling brackets or spacers for stability .
3. Wall-Mounted Brackets: Fixed directly to walls, sometimes at a 45° angle using bracket adapters. They can be used with or without additional threaded rod suspension depending on load requirements .
4. Center Supports: Used for long tray runs to prevent sagging, often installed at intervals defined by the tray width and load rating .

Material and Finish

• Steel or Stainless Steel: Most common for industrial applications, providing high mechanical strength .
• Galvanized or Coated Surfaces: Enhance corrosion resistance in humid or chemically aggressive environments .
• Aluminum: Lightweight and corrosion-resistant, suitable for less mechanically demanding installations .

Load and Span Considerations

• Bracket spacing and tray support must account for maximum permissible cable weight and tray width. Standard support spacing is typically defined by the manufacturer and may vary with tray type (ladder, solid-bottom, or mesh) and load class .
• Horizontal and vertical changes in tray direction must be supported within 150 mm of joints to maintain structural integrity .

Mounting and Fastening

• Ceiling Mounting: Brackets can be attached directly to the ceiling or via threaded rods and ceiling brackets. Mushroom head bolts (e.g., FLM 6x12 or FLM 6x16) are commonly used for fastening .
• Wall Mounting: Brackets may use adapters (e.g., KAWG 12) and can be installed with or without additional threaded rods depending on load and height .
• Flexibility: Modular systems allow on-site adjustments for inclined trays, height changes, or directional bends using compatible fittings and couplers .

Standards and Compliance

• DIN EN 61537: Defines cable support systems, including trays, ladders, and fittings, ensuring safe routing and mechanical support of cables .
• Fire and Circuit Integrity: Some systems comply with DIN 4102 Part 12 for fire resistance, specifying rail height, tray width, hole proportion, and maximum cable weight .

Accessories

• Spacer plates, mounting plates, and adapters are used to attach junction boxes, devices, or additional supports to the tray system .
• Covers, barrier strips, and cable protection rings enhance safety and cable organization . In summary, cable tray support brackets must be selected based on tray type, load, mounting method, material, and compliance with relevant standards, ensuring safe and durable cable management in industrial or commercial installations.