PURPOSE: To permit easy attaching and detaching of an intermediate cable and to improve working efficiency in the stage of connecting respective wire feeders with the intermediate cable by providing power feed fittings and socket in which a power cable is press-fitted to the axial center of a connector and attaching and detaching the connector pins for control arranged on the outside circumference of the socket by means of a ring nut.

CONSTITUTION: The operator rotates manually a ring nut 57 in the case of separating an intermediate cable 7 and the 2nd wire feeder 6 and the 1st connector 45 on the cable 7 side and the 2nd connector 46 on the feeder 6 side can be separated. If the operator rotates the nut 57 so as to tighten the same after confirming that a socket 58 and the 1st connector pins 50 for control are fitted respectively to a plug 59 and the 2nd connector pins 51 for control in the case of connecting both, the cable 7 and the feeder 6 are connected.