Abstract: A method for cleaning and conditioning air in which the air is first passed through or along water in a reservoir, then passed through a layer of soil to clean and condition the air, and then passed through a layer of a germ-reducing material.

Abstract: The invention relates to a biological filter system for cleaning air and a housing for a biological filter system. Moreover the invention relates to a method of cleaning and conditioning air.

Abstract: A power connector element (1) for establishing of electrical connection between a busway and an outgoing or incoming electrical cable (3), generally via a multiphase coupler (8), consists of a unit (1) configured as one piece comprising a number of parallel, massive conductors disposed at a distance from one another and having connection parts at both ends, said conductors being moulded into a common electrically-insulating moulding body, so that only the connection parts are outside. The connection parts are disposed in two areas which are separated by a flange (12) in the moulding body.

Abstract: A flexible power current conductor (1) comprises a number of thin copper foils and is provided with through-going oblong holes (5) for clamping bolts at each end. The foils are held together in a middle area by means of a thermo-shrinking insulating plastic material which engages incisions (4) and secures the foils in relation to each other.

Abstract: A rail insulator (5) for the securing of a conductor rail (2) on a rail support (4) which comprises a substantially U-shaped supporting rail in which holes are provided at regular intervals, preferably in two parallel rows, and where the rail insulator (5) is formed with a notch (18) corresponding to the thickness of the rail being used, is arranged so that on the side turning away from the notch it has outwardly-extending, hook-formed holding elements (24, 25) arranged to grip around and be secured to the rail support (4), in that between the holding elements there is provided a guide stud (30) which fits down into one of the holes in one of the rows of holes. One thus obtains a rail insulator which is well-suited for use in the building up of rail areas, in that the rail insulator can quickly and easily be removed and mounted on the rail support without detracting from the strength and the ability of the rail area to absorb mechanical forces from changes in current.