Cable tray fixing points in power wells should be located at structural support points, typically using hangers, brackets, or center suspensions, with spacing determined by tray type, load, and code requirements.

Key Considerations for Fixing Points

Structural Support: Cable trays must be mechanically supported by the building structure, such as walls, ceilings, floors, or steel beams. Support elements include wall brackets, suspended supports, and center suspensions, which connect the tray to the structure securely . Spacing Between Supports: The distance between fixing points depends on the tray type and load. For ladder-type trays, a maximum support spacing of approximately 3.6 meters (12 feet) is common, with each hanger capable of supporting 318–340 kg (700–750 lbs), . Mesh or solid-bottom trays may require closer spacing to prevent sagging and maintain cable integrity . Alignment with Tray Fittings: Fixing points should be positioned near tray connectors, bends, T-pieces, or crossovers to prevent unsupported spans and ensure proper load distribution . This avoids creating simple beam configurations that could compromise structural stability. Installation Method: Common methods include trapeze or swing supports, threaded rods with nuts pre-threaded for height adjustment, and center-hung supports for easier cable installation . In power wells, vertical alignment is critical, so supports may be attached to side walls or ceiling structures, ensuring the tray remains level and accessible. Code Compliance: Installation must comply with local electrical codes, such as the Canadian Electrical Code (CEC) or National Electrical Code (NEC), which specify support spacing, load limits, and grounding requirements . Practical Tips: Use a string line or laser level to align multiple fixing points along the tray run. Pre-threading nuts on hanger rods can speed installation, and field adjustments may be necessary to accommodate structural obstacles or rerouted tray paths . By following these guidelines, cable trays in power wells can be securely fixed, properly aligned, and capable of supporting the intended cable load safely. Proper planning and adherence to code requirements are essential for long-term reliability and safety.