The cables inside the cable tray are either live or not

Cables inside a cable tray should always be assumed live until properly tested, as they may carry electrical current even if not visibly energized.Electrical Safety in Cable TraysCable trays can contain both live and non-live cables, and the risk of electric shock or arc flash is significant if proper precautions are not taken. Workers should never assume a cable is de-energized without verification using appropriate testing equipment, as accidental contact with live cables can result in serious injury or fatality (Apex Tray) .Earthing and Bonding ConsiderationsThe metallic tray itself may or may not be live depending on its role in the electrical system. If the tray is an exposed-conductive-part—metal that can be touched and could become live under fault conditions—it must be earthed to allow fault current to operate protective devices (Elec Training) . However, if the tray only carries metallic-sheathed cables, the cable sheath provides the fault path, and the tray itself is not considered live, so earthing may not be required (Tradeskills4u) . For non-metallic sheathed cables, the tray is generally safe to touch under normal conditions, as the cables provide Class II protection, and earthing the tray could even increase shock risk (Forum Automation) .Best PracticesAlways test cables with a voltage detector before handling.Assume all cables are live until confirmed otherwise.Follow proper earthing and bonding protocols based on whether the tray is an exposed or extraneous conductive part.Avoid overloading trays to prevent overheating and fire hazards.Maintain structural integrity and clear debris to reduce physical and electrical risks (Apex Tray) . In summary, while not all cables in a tray are necessarily live, safety protocols dictate treating them as live until verified, and the tray's earthing requirements depend on the type of cables and its conductive role in the system.