Standard Size of Cable Tray Support Arm

Cable tray support arms, including cantilever arms, typically have standard lengths of 3000 mm for metal framing channels, with mounting options for M10, M12, or M16 anchors depending on the support structure.

Overview of Cable Tray Support Arms

Cable tray support arms, also called cantilever arms or support brackets, are used to provide mechanical support for cable trays, cable ladders, or trunking systems. They are designed to attach to walls, ceilings, or structural frames and ensure that the cable trays remain stable under the weight of cables and environmental loads such as wind or vibration.

Standard Dimensions

Length: Standard metal framing channels used for support arms are typically 3000 mm long, with a tolerance of ±3. 2 mm. Custom lengths can be manufactured upon request.

Mounting Options: For concrete support frames, anchors such as M10, M12, or M16 are commonly used. For C-channel frames, M10 hex bolts are standard. Material and Finish: Support arms are usually made from low carbon steel and can be finished with pre-galvanized coating (ASTM A653M G90/G60) or hot-dip galvanization (ASTM A123 or BS EN ISO 1461: 2009) for corrosion protection.

Fixing Types: Cantilever arms may have single-bolt or two-bolt fixing options, and can be configured with the open face at the top, bottom, left, or right depending on installation requirements.

Practical Considerations

Load Capacity: The height and thickness of the support arm, along with the type of mounting anchor, determine the load capacity. Ladder trays, perforated trays, and mesh trays may require different arm specifications. Compatibility: Standardized lengths and mounting options ensure compatibility with various cable tray types and fittings, allowing for modular and flexible installation.

Customization: While standard sizes exist, support arms can be customized for unusual spans, heavier loads, or specific installation geometries.

Summary

For most industrial and commercial installations, 3000 mm long cantilever arms with M10–M16 anchor options are standard. These arms are designed to support cable trays safely and efficiently, with flexibility for different tray types and installation conditions. Proper selection ensures compliance with standards such as BS 6946 and DIN EN 61537, and provides long-term structural reliability.