A brush assembly for a slip ring assembly (100, 100") of a rotating electrical machine, for supporting at least one brush electrically contacting a cylindrical surface of a conductive ring of the slip ring assembly, one of the brush assembly and the conductive ring having a rotational movement around a first axis (D1) extending along a longitudinal direction, the brush assembly comprising: - at least one brush holder (120, 120"), said brush holder defining at least one cage into which at least one brush (103, 103") may be slidably received, said brush holder comprising a spring element arranged and installed so as to apply a force onto the brush when said brush is received in the cage so as to push said brush against the cylindrical surface of the conductive ring, said force having a component that is parallel to a radial direction with regards to the first axis; - at least one rod device for supporting the brush holder (120, 120"), characterized in that the at least one rod device comprises a rod element or a rod extending along a second axis (D2) the direction of which having a component that is parallel to the first axis (D1), and comprises at least a part that is made of insulating material, and wherein one of the rod device and the brush holder defines at least one recess , the other one of the brush holder and the rod device comprises a portion that is sized to be received into the recess, said mating portion , said recess is defined by a first wall disposed for abutment against the mating portion when, said mating portion being received in said recess, the brush holder is driven along said rod device in a longitudinal direction parallel to the second axis, said recess is defined by a second wall disposed for abutment against mating portion when, said mating portion being received in said recess, the brush holder is driven in a tangential direction around the second axis. - at least one brush holder (120, 120"), said brush holder defining at least one cage into which at least one brush (103, 103") may be slidably received, said brush holder comprising a spring element arranged and installed so as to apply a force onto the brush when said brush is received in the cage so as to push said brush against the cylindrical surface of the conductive ring, said force having a component that is parallel to a radial direction with regards to the first axis; - at least one rod device for supporting the brush holder (120, 120"), characterized in that the at least one rod device comprises a rod element or a rod extending along a second axis (D2) the direction of which having a component that is parallel to the first axis (D1), and comprises at least a part that is made of insulating material, and wherein one of the rod device and the brush holder defines at least one recess , the other one of the brush holder and the rod device comprises a portion that is sized to be received into the recess, said mating portion , said recess is defined by a first wall disposed for abutment against the mating portion when, said mating portion being received in said recess, the brush holder is driven along said rod device in a longitudinal direction parallel to the second axis, said recess is defined by a second wall disposed for abutment against mating portion when, said mating portion being received in said recess, the brush holder is driven in a tangential direction around the second axis. <EOS>