Spacing between vertical shaft cable tray brackets

For vertical cable tray runs, brackets or supports should generally be spaced between 1.5 to 3 meters, with additional strain relief sections for long runs exceeding 32 meters.

Recommended Vertical Spacing

For vertical shaft installations, the spacing of cable tray brackets depends on the cable type, load, and length of the vertical run. Typical guidance includes:

• Standard vertical support spacing: Brackets or hangers should be installed at intervals of 1.5 meters, although this can vary depending on tray type and cable weight .
• Long vertical runs: For runs exceeding 32 meters, strain relief sections should be incorporated. This usually involves offsetting the cable by at least 2 cable diameters or including a short horizontal section of at least 1 meter to relieve tension .
• Excessive vertical runs: For runs over 100 meters, additional tension-relieving measures are recommended to prevent undue stress on cables and terminations .

Factors Affecting Spacing

• Cable weight and type: Heavier cables or bundles may require closer bracket spacing to prevent sagging and mechanical strain .
• Tray material and design: Mesh, ladder, or solid-bottom trays may have different load capacities, influencing support intervals .
• Environmental conditions: External forces such as wind, vibration, or seismic activity may necessitate closer spacing .
• Strain relief: At points where the cable changes direction or at long vertical runs, strain relief sections are critical to maintain cable integrity .

Practical Installation Tips

• Ensure hangers or brackets are robust, typically with a minimum rod diameter of 8 mm for vertical runs .
• Place supports symmetrically at bends to prevent stress on cables .
• Maintain adequate clearance between trays and walls or other structures to allow for maintenance and heat dissipation .
• Follow manufacturer-specific guidelines and applicable standards such as BS EN 61537 for cable trays and BS 6946 for channel support systems . By adhering to these spacing recommendations, vertical cable tray installations will maintain structural integrity, prevent cable damage, and ensure safe, long-term operation.