Vertical Fixing Support for Cable Tray in Electrical Wells

Proper cable fixing in vertical cable trays requires secure support, correct spacing, and adherence to code to ensure safety and maintain cable integrity.

Key Principles for Vertical Cable Tray Installation

1. Support and Mounting: Vertical cable trays must be supported using wall brackets, cantilever supports, or trapeze hangers depending on the structure of the electrical well and the tray type (ladder, ventilated trough, or mesh) . Supports should be spaced according to the manufacturer's load capacity and the total anticipated cable weight, typically not exceeding 3.6 meters for heavy loads . Center-hung supports can facilitate easier cable installation from both sides. 2. Cable Fixing and Routing: Cables should be secured to the tray rungs or side rails using approved cable ties, clamps, or tray clips. In vertical runs, cables must remain parallel and evenly spaced to prevent sagging or excessive tension . Pre-drilled holes in the tray or structural members allow for precise alignment and secure attachment. Vertical cable runs often require intermediate support balusters to maintain spacing and prevent cable movement . 3. Load and Fill Considerations: Overfilling a vertical tray can lead to overheating and mechanical stress. Calculate the total cross-sectional area of all cables and ensure it does not exceed the tray's maximum fill capacity as per NEC 392.22 or local codes . Proper spacing also ensures that ampacity is not derated unnecessarily. 4. Safety and Compliance: All installations must comply with relevant standards such as BS EN 61537 or DIN EN 61537 for cable support systems . Vertical trays are not designed to support personnel; they are strictly for cable support. Ensure grounding and bonding requirements are met to maintain electrical safety . 5. Practical Tips:

• Plan the vertical route to minimize bends and reduce pulling tension.
• Use rollers or sheaves for long vertical pulls to prevent jacket abrasion.
• Secure cables at regular intervals, typically every 300–600 mm depending on cable type and weight.
• Consider environmental factors such as moisture, temperature, and corrosive substances when selecting tray material and fasteners . By following these guidelines, vertical cable trays in electrical wells can be installed safely, maintain cable integrity, and allow for future maintenance or upgrades without compromising system performance.