Abstract: A respiratory protection device comprises a housing (1) defining a chamber within the housing. The chamber is open in a region which in use is adapted to be nearest to a user. A porous element (3) is located within the chamber and a communicating member (5) communicates with the porous element (3) within the chamber.

Abstract: A compartment module for a metal-enclosed, modular medium-voltage distribution system has an essentially box-type construction and includes a first set of mutually opposite completely closed walls, a second set of mutually opposite walls having identical large openings bounded by a narrow flange, and a third set of mutually opposite walls having small openings bounded by a wide flange. When assembled, a number of the modules can be arranged to face one another with similar walls and the remaining openings closed off by a cover. The modules can be mechanically coupled to each other by bolt joints or clamp joints in order to obtain a mechanical and electromagnetic seal. A method of manufacturing a module from sheet metal, and a method of manufacturing a medium-voltage distribution system from standard modules includes using isolators and busbar systems.

Abstract: Metal-encased modular medium-voltage distribution system with one or more sections constructed of compartmental modules having components of the distribution system and each section having at least one first busbar system for internal section connection including n phases, each of the phases extending substantially rectilinearly in a first direction (x). At least one second busbar system with n phases for external connection to other sections, each of the phases of the second busbar system extending essentially rectilinearly in a second direction (y) substantially perpendicular to the first direction (x).