Patent ID: 8393922

Claim:
A connection system of an electrical equipment unit comprising: a housing having insulating walls; a terminal comprising a connection tunnel and a screw cooperating for a relative movement of the screw with respect to the tunnel; a pressure device comprising two flexible wings joined to one another at one end by a head strip secured to the screw and at the other end by a pressure strip located in the connection tunnel, said wings being symmetrical with respect to an axial plane of the screw and each comprising a central part, such that the distance between the central parts of the wings increases when the pressure device is compressed between the head strip and the pressure strip so that said pressure device is able to store a clamping energy; means for detecting a predetermined tightening torque of the screw comprising a first element securedly affixed to one of said walls and a second element securedly affixed to one of said wings, said one wing and said one wall being adjacent to one another when the terminal is in place in the housing, means for detecting a distance separating the first and second elements, and indicating means coupled with the means for detecting, for indicating when said distance is smaller than or equal to a threshold distance; and wherein the second element is located at a level along the central part and wherein the first element extends parallel to the axis of relative movement of the terminal over a sufficient length to be facing the second element in all the relative positions of the terminal with respect to the housing.