A bus bar according to an embodiment includes a block-shape thick portion, two thin portions provided along the thick portion on both sides, and two bend portions that connect the thick portion and the thin portions, the connected thick portion and the thin portions being elastically deformable.

The invention relates to a modular and compact arrangement (200) of three phases (A, B, C) of a gas-insulated apparatus (100), that is suitable for placement inside a tunnel or a pipe (106) or another confined space. According to the invention, the three phases (A, B, C) are arranged in a triangle or side-by-side on a fixation part (103, 104) which includes a roller system (105; 105a, 105b, 105c, 105d). This allows the insertion of such a three-phase assembly (100) into confined spaces such as pipes or tunnels (106), without the need for access by workers or machinery. Furthermore, the present disclosure relates to a method for assembling and installing such a three-phase arrangement (100) into the confined space (106).

An electrical bus bar assembly includes a first bus bar segment, a second bus bar segment separated from the first bus bar segment, and a first plurality of bearings formed of an electrically conductive material and in electrical contact with the first bus bar segment and the second bus bar segment. The first plurality of bearings is configured to allow the first bus bar segment to move relative to the second bus bar segment. A method of manufacturing such an electrical bus bar assembly is also provided.