Abstract: The invention relates to a holder for mounting a plate, such as a front plate, a contact protective plate or a circuit card, within an enclosure for electric installations, which enclosure comprises a bottom part and which holder is constituted by an elongated member comprising a body part and having at least at one end a hole for fastening the holder to the bottom part, wherein at least one end of the holder comprises an expanding wedge part arranged to expand against the bottom part, when a fastening means is mounted in a hole at the end of the holder, whereby a support surface is attached to the wedge part, the support surface being intended to press the wall of the bottom part for fastening the holder by friction joint within the enclosure at a desired height from the bottom of the bottom part.

Abstract: The invention relates to a holder for mounting a plate, such as a circuit card, within an enclosure for electric installations, which enclosure includes a bottom part and which holder is constituted by an elongated element including a body part and having a fastening mechanism at least one end for fastening the holder to the bottom part, wherein the holder includes a hinge mechansim for fastening the plate at its one edge pivotally to the holder so that the plate can be lifted upwards at its edge opposite to said one edge, which enables an access into the space below the plate in the enclosure, when the holder is fastened to the bottom part of the enclosure.

Abstract: The invention concerns a method for the treatment of the spent liquors obtained from pulp production processes in the wood-processing industry, in which method the waste obtained from a chemical cooking process and that obtained from a mechanical process are merged for joint treatment. The chemical process may be e.g. a sulphate process and the mechanical process e.g. a chemi-thermomechanical process (CTMP), and the invention presupposes that the facilities for these processes are located close by each other, suitably within the same industrial complex. The essential feature of the invention is that the spent liquor of the CTMP is used as wash water in counter-current washing of the pulp obtained from the chemical process.