The electrical clamp has an insulating housing (15) for fixing to a profile (11.I) with side arms (12A,12B) having lipped edges (13A,13B), engaged by a stop element (18) and a clamp piece (20). An axial control screw is inserted in a nut (22) provided by the clamp piece, with the stop element having a shoulder (42) transverse to the shaft (30) of the control screw acting against the clamp piece.
