Auxiliary beam for cable tray

Auxiliary beams are structural supports used to suspend, stabilize, and distribute the load of cable trays in electrical installations.

Purpose of Auxiliary Beams

Auxiliary beams serve as horizontal support structures for cable trays, ensuring that the weight of cables is evenly distributed and that the trays remain stable under load. They are particularly important for large or heavy cable trays, long spans, or installations where ceiling or wall mounting alone cannot provide sufficient support . These beams help prevent sagging, maintain alignment, and allow safe routing of electrical and communication cables.

Types of Auxiliary Beams

1. Hoisting Frames: Designed for small-sized cable trays, hoisting frames are cost-effective and easy to install. They typically use a suspension rod and a five-piece fastening kit, with a recommended spacing of 1.5 to 2 meters between frames .
2. Cross Arms: Used for large or heavy cable trays, cross arms provide enhanced stability and facilitate maintenance. Each cross arm usually requires two suspension rods and two sets of fastening kits, spaced every 1.5 to 2 meters .
3. L-Shaped or Angle Iron Brackets: These are customizable supports for specific site conditions, including vertical, gantry, or wall-mounted configurations. They can be adapted to support unusual spans or complex routing .
4. Suspension Rods (Threaded Rods): Vertical connectors that link the ceiling or overhead structure to the auxiliary beam or cross arm, ensuring secure load transfer .

Installation Considerations

• Auxiliary beams should be installed according to load requirements, including the weight of cables, equipment, and environmental factors such as wind or vibration .
• Wall-mounted or ceiling-mounted supports must be fixed using appropriate bolts and expansion components to ensure stability .
• The system should comply with standards such as BS EN 61537 for cable trays and BS 6946 for channel support systems .
• Proper grounding and electrical continuity should be maintained using special conductors and washers to prevent static, EMI, or electric shock .

Practical Tips

• Use one hoisting frame or cross arm per 1.5–2 meters of cable tray to maintain structural integrity .
• For long spans, consider intermediate auxiliary beams to reduce sag and stress on the tray.
• Ensure all components are compatible and tested together to guarantee safety and durability .
• Auxiliary beams can be made from steel or stainless steel, often with galvanization or corrosion-resistant coatings for industrial or outdoor environments . By selecting the appropriate type of auxiliary beam and following proper installation practices, cable tray systems can achieve maximum stability, safety, and longevity while supporting the required electrical infrastructure.