Article Overview
Cable trays are typically fastened using M6 truss-head bolts (FRS) and combination nuts, with screw quantity depending on tray width and side height.
Recommended Screw Sizes and Quantities
- Screw Type: FRS truss-head bolts with combination nuts
- Diameter: M6
- Drill Hole Size: ≥ 7 mm in tray rail and base
- Material: Stainless steel (A2) or as specified for corrosion protection
- Temperature Range: ‒20 °C to 120 °C for standard installations
Screw Quantity Guidelines
| Tray Width | Side Height | Screws per Connector / Joint Plate |
|---|---|---|
| Up to 300 mm | 60 mm | 4 screws per connector |
| 300 mm | 60 mm | 3 screws per joint plate |
| 400 mm or more | Any | Joint plate required to avoid transverse bending; use M6 truss-head bolts |
| 100–600 mm | 35–110 mm | Fittings fastened with double clamps (DOP A2) or FRS bolts; vertical bends and 35 mm side height fittings are exceptions and can only be screwed on |
Installation Notes
- Joint plates are optional for tray widths up to 300 mm but mandatory for widths of 400 mm or more to prevent bending .
- Covers may come with pre-mounted turn buckles or without fastening material; installation depends on the type of fitting (T-piece, add-on tee, bends).
- Edge protection strips should be used at cut edges if no joint plates or end plates are mounted to prevent cable damage .
- Always follow manufacturer-specific guidelines, as screw type and quantity may vary depending on the cable tray system and environmental conditions . This table and guidance ensure proper mechanical stability and compliance with IEC 61537 standards for low-voltage cable tray systems .
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