WARNINGLEAKAGE CURRENT HAZARDLeakage currents exceed 3.5 mA. Failure to ground thefrequency converter properly could result in death orserious injury.• Ensure correct grounding of the equipment bya certified electrical installer.9.2 CablesNOTICECables GeneralAll cabling must comply with national and localregulations on cable cross-sections and ambienttemperature. Copper (75 °C) conductors arerecommended.Aluminium ConductorsTerminals can accept aluminium conductors, but theconductor surface has to be clean and the oxidation mustbe removed and sealed by neutral acid-free Vaselinegrease before the conductor is connected.Furthermore, the terminal screw must be retightened after2 days due to softness of the aluminium. It is crucial tokeep the connection a gas tight joint, otherwise thealuminium surface oxidises again.9.2.1 Tightening TorqueEnclosureType200-240 V[kW]380-500 V[kW]525-690 V[kW]Cable for Tightening-up torque[Nm]A1 0.25-1.5 0.37-1.5 -Mains, Brake resistor, load sharing, Motor cables 0.5-0.6A2 0.25-2.2 0.37-4 -A3 3-3.7 5.5-7.5 1.1-7.5A4 0.25-2.2 0.37-4A5 3-3.7 5.5-7.5 -B1 5.5-7.5 11-15 -Mains, Brake resistor, load sharing, Motor cables 1.8Relay 0.5-0.6Ground 2-3B2 11 18.5-22 11-22Mains, Brake resistor, load sharing cables 4.5Motor cables 4.5Relay 0.5-0.6Ground 2-3B3 5.5-7.5 11-15 -Mains, Brake resistor, load sharing, Motor cables 1.8Relay 0.5-0.6Ground 2-3B4 11-15 18.5-30 11-30Mains, Brake resistor, load sharing, Motor cables 4.5Relay 0.5-0.6Ground 2-3C1 15-22 30-45 -Mains, Brake resistor, load sharing cables 10Motor cables 10Relay 0.5-0.6Ground 2-3C2 30-37 55-75 30-75Mains, motor cables 14 (up to 9 5mm2)24 (over 95 mm2)Load Sharing, brake cables 14Relay 0.5-0.6Ground 2-3C3 18.5-22 30-37 37-45Mains, Brake resistor, load sharing, Motor cables 10Relay 0.5-0.6Ground 2-3C4 37-45 55-75 -Mains, motor cables 14 (up to 95 mm2)24 (over 95 mm2)Load Sharing, brake cables 14Relay 0.5-0.6Ground 2-3Table 9.1 Tightening Torque for CablesElectrical Installation VLT® AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kWMG33BF02 - Rev. 2013-12-20 1139 9
