185 Cable Tray Installation Standard

Installing cable trays for 185-type cables requires careful planning, proper tray selection, correct sizing, secure mounting, and adherence to electrical codes to ensure safety and performance.

Planning and Route Design

Before installation, plan the cable tray route based on your site layout, cable type, and load requirements. Consider clearance from other services, future expansion, and environmental conditions. Mark the path using a chalk line or laser level to ensure straight, level alignment for wall-mounted or ceiling-suspended trays .

Tray Selection

Choose a tray type suitable for large or heavy cables like 185-type. Ladder trays are preferred for high-capacity cables because they provide ventilation, heat dissipation, and easy cable entry. Perforated or solid-bottom trays may be used for lighter loads or where aesthetics and protection are priorities . Material selection (galvanized steel, aluminum, or fiberglass) should match environmental conditions to prevent corrosion .

Sizing and Fill Calculations

Calculate the tray width and depth based on the number of 185-type cables and their cross-sectional area. Use NEC Table 392.22(A) or manufacturer specifications to determine maximum fill. Ensure the total cable area does not exceed the tray's rated capacity, and consider ampacity derating for high-density fills . Maintain proper spacing between cables to prevent overheating.

Support and Mounting

Install supports at regular intervals, typically 1.5 to 3 meters depending on tray type and load. Wall-mounted trays use cantilever brackets, while ceiling trays use trapeze or C-hanger systems with threaded rods and Unistrut channels . Ensure all supports are level and secure to prevent sagging.

Cable Laying and Routing

Lay cables neatly, using cable ties or straps to organize by voltage or function. Maintain the minimum bend radius for 185-type cables to avoid damage. Use rollers or sheaves for long runs to prevent kinks and abrasion . Plan bends, tees, and risers carefully to maintain smooth cable paths.

Grounding and Bonding

For metal trays, bond and ground all sections to maintain electrical continuity and safety. Use proper bonding jumpers across tray sections and ensure compliance with NEC or local electrical codes .

Final Checks

• Verify tray alignment, level, and secure connections.
• Confirm cable fill does not exceed rated capacity.
• Ensure proper slack for expansion or future adjustments.
• Inspect for potential interference with other services or hazards. By following these steps, your installation will be safe, scalable, and compliant, providing reliable support for 185-type cables while allowing for future maintenance and expansion .