Kit for a bushing arrangement for the electrical connection of a transformer installation through an opening in a housing wall of the transformer installation, the kit comprising - at least one first insulating element which can be inserted into the opening in the housing wall and has a lead-through opening for receiving an elongated conductor, the lead-through opening of the first insulating element being arranged for guiding the conductor from an outer side (2") of the housing wall to an inner side of the housing wall opposite the outer side (2"), and being further arranged to insulating the conductor along the guide inside the feed-through opening with respect to the housing wall, the insulating element having a stop surface or being connected to such a stop surface, by means of which an insertion movement of the insulating element in the direction of the opening of the housing wall can be limited, in that the stop surface can be supported on the outer side (2") of the housing wall, - at least one clamping element, which is guided on the first insulating element so as to be displaceable in the longitudinal direction of a received conductor, wherein the at least one clamping element can be brought from a first position projecting from the periphery of the first insulating element into a second position approaching the periphery of the first insulating element, wherein the at least one clamping element is arranged on the first insulating element in such a way that, in the second position, it can be brought closer to the periphery of the first insulating element, that it can be moved through the opening of the housing wall in the moved-up second position and that it limits a displacement of the first insulating element in the first position in the installed state of the bushing arrangement in the direction of the outside (2") of the housing wall by support on the inside of the housing wall, characterized in that the at least one clamping element or a clamping element holding device holding the at least one clamping element and the first insulating element each have an opening (8a, 8b) for receiving a set screw mechanically connecting the clamping element to the first insulating element, the set screw engaging with the at least one clamping element and the first insulating element in such a manner that the clamping element is displaceable in the longitudinal direction of a received conductor with respect to the first insulating element in the direction of the inner side of the housing wall by tensioning the set screw and is thereby tensioned in the first position in the installed state against the inner side of the housing wall. - at least one first insulating element which can be inserted into the opening in the housing wall and has a lead-through opening for receiving an elongated conductor, the lead-through opening of the first insulating element being arranged for guiding the conductor from an outer side (2") of the housing wall to an inner side of the housing wall opposite the outer side (2"), and being further arranged to insulating the conductor along the guide inside the feed-through opening with respect to the housing wall, the insulating element having a stop surface or being connected to such a stop surface, by means of which an insertion movement of the insulating element in the direction of the opening of the housing wall can be limited, in that the stop surface can be supported on the outer side (2") of the housing wall, - at least one clamping element, which is guided on the first insulating element so as to be displaceable in the longitudinal direction of a received conductor,