How to connect the wireless cable tray in the distribution box

To connect a wireless cable tray to a distribution box, you need to plan the route, select the appropriate tray type, secure it with brackets and splices, and ensure proper grounding and cable management.

Step 1: Plan the Route

Before installation, mark the cable tray route from the distribution box to the intended endpoints. Consider clearance, load capacity, and separation from other electrical systems to avoid interference and ensure safety .

Step 2: Select the Right Tray Type

Choose a tray type that suits your application:

• Wire mesh trays for flexibility and easy modifications.
• Ladder trays for heavy power cables and long spans.
• Solid or ventilated trays for protection against dust or moisture .

Step 3: Mounting and Supports

• Use mounting brackets, wall supports, or ceiling hangers to secure the tray. Supports should typically be spaced 1.5 to 3 meters apart depending on tray type and load .
• Ensure the tray is level and aligned with the distribution box entry point.

Step 4: Connecting Tray Sections

• Use splice plates or bolted splices to join tray sections end-to-end. This ensures structural integrity and continuous cable support .
• For bends or elevation changes, use fittings like horizontal or vertical bends, tees, or reducers to maintain smooth cable routing .

Step 5: Securing Cables

• Lay cables inside the tray carefully, avoiding kinks or sharp bends.
• Use hold-down clamps or cable ties to secure cables within the tray, preventing movement and reducing strain on terminations .

Step 6: Grounding and Safety

• Ensure the tray system is properly grounded according to NEC Article 392. Aluminum trays should not be used as grounding conductors for circuits above 600A .
• Verify that the tray's cross-sectional area meets the current-carrying capacity requirements for the cables installed .

Step 7: Final Connection to Distribution Box

• Route the tray to the entry point of the distribution box.
• Use drop-outs or cable glands to guide cables into the box without damaging insulation.
• Ensure all connections are secure, neat, and compliant with local electrical codes . Following these steps ensures a safe, organized, and code-compliant connection of a wireless cable tray to a distribution box, while allowing for future maintenance and expansion.