How to install cable tray corners

Proper installation of cable tray corners involves careful planning, maintaining bend radius, and ensuring secure support and grounding to protect cables and comply with NEC standards.

Planning and Preparation

Before installing corners, review the approved shop drawings to identify the tray route, corner locations, and any potential clashes with other services like HVAC ducts or pipes . Ensure all materials, including trays, connectors, and supports, are available and approved for use . Mark the path and corner points using a chalk line or laser level to maintain alignment and level installation .

Corner Installation Techniques

For rigid ladder or perforated trays, use factory-made 90-degree elbows or bends whenever possible. These fittings provide consistent bend radius and structural integrity. For wire mesh trays, field modifications are common: cut and bend the tray on-site to navigate corners or irregular angles . Make strategic side cuts to allow smooth transitions and maintain the proper bend radius, especially for sensitive cables like Ethernet or fiber . Avoid sharp bends that could damage cable insulation or reduce performance.

Support and Spacing

Install supports at appropriate intervals, typically every 1.5 to 3 meters depending on tray type and load . At corners, add extra support brackets or wall arms to prevent sagging and maintain stability. Ensure that vertical and horizontal clearances are maintained to avoid interference with other systems .

Grounding and Bonding

After modifying or installing corners, verify that all trays are properly grounded and bonded according to NEC Article 392 . This ensures electrical safety and prevents potential hazards from stray currents.

Cable Management

Do not overfill trays at corner sections, as this can cause overheating and make future maintenance difficult . Use cable ties or clamps to secure cables neatly, maintaining separation between power and communication lines where required .

Final Checks

Once corners are installed, inspect alignment, support integrity, and cable placement. Ensure all modifications comply with NEC standards and project specifications . Properly installed corners contribute to a safe, organized, and maintainable cable tray system.