This document applies to pressurized partitions used in indoor and outdoor installations of high-voltage AC and DC switchgear and controlgear with rated voltages (Ur) above 1 kV AC / 1,5 kV DC and with design pressure higher than 300 kPa, where the gas is used principally for its dielectric and/or arc-quenching properties. Gases with insulating properties are dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases. The partitions comprise pressurized barriers in electrical equipment not necessarily limited to the following examples: circuit-breakers; switch-disconnectors; disconnectors; earthing switches; current transformers; voltage transformers; surge arrestors; busbars and connections; cable connections / terminations cable bushings etc. Partitions which are only pressurized from one side are also covered. 1 kV AC / 1,5 kV DC means it is valid for the apparatus applied and where the partitions are installed, however, the application of voltages below 1 kV AC / 1,5 kV DC as in e.g. current and voltage transformer are not excluded. This document does not apply to high voltage bushings (see EN 60137, EN 61462 and EN 62155).