How to run 185 cable through cable trays

To install a 185 mm² cable into a cable tray, plan the route, select the appropriate tray type and size, maintain proper spacing, and secure the cable to prevent damage and overheating.

Step 1: Plan the Route

Before installation, mark the cable tray route using a laser level or straight line to ensure alignment. Consider clearance, load capacity, and separation from other services to avoid interference and maintain safety standards .

Step 2: Select the Right Cable Tray

Choose a tray type suitable for large cables like 185 mm². Ladder trays are ideal for heavy cables because they provide airflow and easy cable entry, while perforated or solid-bottom trays may be used depending on load and environmental conditions . Ensure the tray material (aluminum, steel, or fiberglass) matches the installation environment .

Step 3: Verify Tray Size and Load Capacity

Calculate the tray width and depth based on the cable diameter and number of cables. Cable fill should not exceed 40% of the tray capacity to prevent overheating and allow future expansion . For a 185 mm² cable, check the tray's weight capacity and support spacing, typically 1.5 to 3 meters apart, to prevent sagging .

Step 4: Prepare the Tray

Install the tray on wall mounts (cantilever arms) or ceiling mounts (trapeze hangers) using appropriate fasteners. Connect tray sections with splice plates and ensure the tray is level and straight before tightening .

Step 5: Lay the Cable

Carefully place the 185 mm² cable into the tray, avoiding sharp bends. Maintain the minimum bend radius specified by the cable manufacturer to prevent insulation damage . Use cable rollers for long runs to reduce stress and kinks.

Step 6: Secure the Cable

Fix the cable at regular intervals using cable ties or clamps designed for large cables. Ensure spacing follows design standards to prevent movement, reduce heat buildup, and maintain system reliability . Label the cable for identification and future maintenance.

Step 7: Final Inspection

Check that the cable is properly seated, secured, and that the tray is free from sharp edges or obstructions. Verify compliance with relevant standards such as IEC 61537 or NEC Article 392 . By following these steps, a 185 mm² cable can be safely and efficiently installed in a cable tray, ensuring long-term performance and compliance with electrical standards.