Cable tray failures can vary widely, depending on the environmental conditions and installation practices. This guide discusses common cable tray problems, from loosening and corrosion to grounding issues and installation errors, along. The entire cable line is completely burned or one of the phases is damaged, causing all the current relays on the distribution cabinet to activate. The damage at the fault location is extremely severe. Short circuits occur in all phases of the cable, which will also trigger the interlocking. Cable trays are an essential part of electrical installations in buildings, providing support and protection for various cables and wires. Common mechanical problems include: Sagging and Deflection: Excessive bending occurs when trays carry loads beyond their designed capacity or when support intervals are. A common but often overlooked safety hazard is the falling off of cable tray covers.