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 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 (101, 101') or a rod extending along a second axis the direction of which having a component that is parallel to the first axis, 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 (123, 124) 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 (101, 101') or a rod extending along a second axis the direction of which having a component that is parallel to the first axis, 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 (123, 124) 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.