for many years overhead cranes have been powered by means of festooning systems and conductor bars. today more modern alternatives are available like cavotec power chains. advantages are reduces cable length and weight b......for many years overhead cranes have been powered by means of festooning systems and conductor bars. today more modern alternatives are available like cavotec power chains. advantages are reduces cable length and weight by more than 50% allows trolley speeds exceeding 200 m/min allows separation of power and control cables allows any combination of cables, hoses and fibre optic cables low and easy maintenance