Equipotential bonding wire for cable trays

Copper or aluminum conductors with a minimum cross-sectional area of 6 mm² (copper) or 10–16 mm² (aluminum) are typically used for equipotential bonding in cable trays.Material and Cross-SectionFor equipotential bonding, copper is preferred due to its superior conductivity and corrosion resistance, though aluminum can also be used if proper precautions are taken to prevent galvanic corrosion when connecting to copper components . According to DIN VDE 0100, the minimum cross-section is 6 mm² for copper and 16 mm² for aluminum round wire for protective bonding . In general, the cross-sectional area should be at least half of the largest protective earth (PE) conductor in the system, but not exceed 25 mm² for copper or 35 mm² for aluminum .Installation ConsiderationsEquipotential bonding conductors should form a closed ring or radial connection along the cable tray system, connecting all metallic parts and electrical equipment such as motors, sensors, and power units . Clamps, bonding plates, and hammerhead bolts are commonly used to secure the conductor to the tray rails, ensuring both mechanical stability and reliable electrical contact . Stainless steel intermediate elements or lugs are recommended when connecting copper to aluminum to prevent contact corrosion .Mechanical ProtectionWhere the conductor is exposed, it should be mechanically protected using conduits, ducting, or cable trays to prevent damage . This is particularly important in industrial environments or areas with high vibration or potential impact.SummaryMaterial: Copper (preferred) or aluminum (with precautions)Minimum cross-section: 6 mm² (copper), 10–16 mm² (aluminum)Configuration: Closed ring or radial along cable traysConnection: Clamps, bonding plates, hammerhead bolts; use stainless steel lugs for dissimilar metalsProtection: Mechanical protection where exposed Using the correct conductor type and installation method ensures effective equipotential bonding, reducing the risk of electric shock and protecting equipment from potential differences and lightning-induced surges .