Safe-Lec 2 100 Amp Collector - Standard Phase , Single Arm Collector, Collector Shoe Shunt Wire is Integrated into the Arm. Incoming Cable is Connected to the Terminal Lug at the Base of the Collector (Maximum 6 AWG). Safe-Lec 2 "V-Contact" Collectors Articulate to Accurately Track in the Conductor Bar Groove for Superior Conductivity. Includes Long-Wearing Copper Graphite Shoe (in Holder) and Shunt Wires (Indicated Above). Collector Arms are Designed to Accommodate a Certain Amount of Movement or Misalignments Between the Crane / Vehicle and the Conductor. However, if Misalignements are Excessive the Collector Could Disengage from the Bar. Poor Collector Installation is the Single Greatest cause of New System Problems. Installation Instructions Should be closely followed to Optimize System Performance and Prevent Problems.