Abstract: A resilient contact assembly for biasing a bare electrical conductor having a relatively large diameter into lateral engagement with a bus bar, characterized by the provision of a separate auxiliary electrically conductive contact that extends between the bus bar and the conductor when the conductor is inserted into the tension spring clamping opening between the auxiliary contact and the clamping edge of the opening. The auxiliary contact includes a body portion and at least one mechanical support portion arranged to engage different peripheral surface areas of the bare conductor, thereby to support the conductor relative to the bus bar and to effect a positive electrical connection between the conductor and the bus bar.