a terminal block equipped with connection parts which avoid the necessity of stripping the connecting wires . the terminal block has a groove inside which is accommodated firstly at least one connection part whose lips form an automatic stripping and blocking slot in the axis of the groove and secondly a pusher which can be manipulated from the outside and can move in translation in the groove between a partial interpenetration position with the part and a position allowing the insertion of suitable wire between said pushing piece and the part . the invention relates to electric connection and more particularly to the connection of energy distribution wires .