Installation of Wall-Mounted Photovoltaic Cable Trays

Wall-mounted PV cable trays should be securely supported, properly aligned, and routed to comply with electrical codes while optimizing cable management and accessibility.

Planning and Design

Before installation, a qualified engineer or system designer should plan the layout, taking into account local building codes, PV module positions, inverter locations, and clearances for other trades ( ). Using PV design software like Virto.CAD can automate cable tray routing, detect roof obstacles, and calculate cable lengths, reducing errors during execution ( ).

Wall-Mount Supports

Wall-mounted trays typically use brackets or supports such as RVK or AS mounting rails ( ). These supports are positioned inside or beneath the tray to provide a clean and secure installation. The tray edges are lifted onto the bracket tips and pressed into place to ensure stability ( ).

Hardware and Fastening

• Use threaded rods, hex nuts, and washers to secure cross members and vertical hangers ( ).
• Drill clearance holes slightly larger than the rod diameter to allow adjustment without thread damage ( ).
• For ladder or trough trays, mounting hardware such as 3/8” bolts or self-tapping screws should be torqued according to manufacturer specifications (e.g., 19–35 ft-lbs) ( ).
• Ensure flush contact between splice plates and tray rails to maintain structural integrity ( ).

Spacing and Alignment

• Vertical hangers should be properly positioned to allow horizontal adjustment of the tray ( ).
• Support spacing depends on tray type, weight, and cable load; typically, trays are supported within 24 inches of each end and at bends or transitions ( ).
• Maintain a minimum clearance of 12 inches above and to the side of the tray for accessibility and safety ( ).

Routing and Cable Management

• Plan AC and DC cable paths early to minimize lengths and avoid obstacles ( ).
• Use T-points, height adjustments, and bridging between walls or buildings as needed ( ).
• Ensure trays are accessible for maintenance and protected from physical damage ( ).

Compliance and Safety

• Follow the Canadian Electrical Code (CEC) or relevant local codes ( ).
• Ensure all personnel are trained in electrical safety, grounding, and lockout procedures ( ).
• Avoid cutting structural members and do not install trays in hoist ways or areas prone to damage ( ). By carefully planning, using proper wall supports, and following code-compliant installation practices, wall-mounted PV cable trays can provide a safe, durable, and efficient solution for solar projects.