Yes, cables can be connected in cable trays, but only tray-rated cables that comply with NEC standards should be used, and proper installation practices must be followed.

Types of Cables Suitable for Cable Trays

Cable trays are designed to support a variety of cables, including:

• Power Cables (Type TC): Used for industrial power or control circuits, rated for 600 volts, and suitable for installation in cable trays, raceways, or outdoor locations with proper support .
• Control Cables: Facilitate communication and control in systems like HVAC, connecting sensors, thermostats, and control panels .
• Ethernet Cables: Must meet fire and performance ratings such as CMR, CMP, or tray-rated for PoE devices and network infrastructure .
• Fiber Optic Cables: Installed in trays for high-speed backbone connections, requiring careful planning to maintain signal integrity .
• Instrumentation Tray Cables (ITC/PLTC): Used for low-voltage instrumentation and control circuits, available in shielded or unshielded forms, and must be continuously supported and secured every six feet .

Installation Guidelines

• Tray Types: Ladder, solid-bottom, ventilated trough, wire mesh, and channel trays are available, each providing different levels of support, ventilation, and protection .
• Securing Cables: Use cable ties, cleats, or straps to organize cables, prevent stress on terminations, and maintain separation by voltage or signal type .
• Bends and Drop-Outs: Use horizontal and vertical bends, tees, and drop-outs to route cables safely to equipment .
• Tray Fill Limits: Adhere to NEC Article 392 fill rules to prevent overheating and allow maintenance access .
• Grounding and Bonding: Metallic trays must be electrically continuous, properly bonded at all splice points, and connected to the building's grounding system to ensure safety .

Best Practices

• Maintain minimum bend radius for cables exiting trays to avoid damage .
• Ensure proper spacing and support to prevent sagging or mechanical stress .
• Select tray material and finish based on environmental conditions, such as aluminum for corrosion resistance . By following these guidelines, cables can be safely and efficiently connected in cable trays, ensuring compliance with electrical codes and long-term reliability of the installation.