Tube-type Multi-polar trolley wire. 1.High safety. 2.Steady performance. 3.Superior qaulity. 4.Easy to install and use. Tube-type Multi-polar trolley line1.InstructionSL-HFP multi-polar(phase) tube-type trolley wire ,is a kind of safe, economical, reliable device that can be widely used. Meanwhile, it is a reliable alternative of cable shell-off coil cylinder. According to different structure, ...