) When power is fed with a power feeding brush to the base material on the rotating jig
Insulate the power feeding brush that connecting to power cable for base metal from the jig base, and connect the voltage detection cable (on the base metal side) to the jig base. Before this wiring, confirm that the conduction between the jig base and welding workpiece is electrically stable. If the voltage detection cable (on the base material side) is connected to a potential section different from that of the welding workpiece, capability of the power source may not be fully used for the reason that it is affected by a voltage drop that will occur on the power feeding brush for the cable on the base metal side, etc.