In an enclosed gas filled electric conductor arrangement, at least the surface (3A) at the bottom side of an electric conductor (3) is formed in an inclined surface by gradually reducing the cross section (D1, D2) of the electric conductor from one insulator spacer (2A) at one side toward another insulator spacer (2B) at the other side.
Because of an angle (ϑ ) of the inclined surface (3A), the spacing distance between the electric conductor (3) and the bottom surface (1A) of a grounded tank (1) increases depending upon distance away from one insulator spacer (2A), thereby, a conductive foreign particle (50) is designed to move away from the surface of the insulator spacer (2A) and is trapped by a conductive foreign particle trapping means (10) disposed at the center bottom surface (1A) of the grounded tank, and is prevented from being deposited on the insulator spacer (2A), thereby, the insulation reliability of the enclosed electric conductor arrangement for the gas insulated apparatus is enhanced as well as the size and weight of the arrangement can be reduced.