Abstract: The device includes an inner frame to be situated on a base section of a tray, being attachable to grooves of the base section. The device also includes an electrical mechanism mounting plate being attachable to the inner frame, as well as being attachable to boxes containing the electrical mechanisms or to the electrical mechanisms themselves and with a retaining device to an outer frame. The latter is attachable to the inner frame which it completely covers and also is attachable to the grooves of the base section.

Abstract: Ducting for electrical conductors with a stiffening arrangement formed by stiffening clamps, each of which comprises two or more parts between which there are transverse gaps separating aligned mutually inserted engaging members of both parts; each pair of adjacent parts are connected by lateral flaps attached to each part across a weakened area.The ducting is of the type having a base wall, two side walls having top ends provided with coupling formations, and intermediate longitudinal partition members each provided with an upper terminal formation. The engaging members of the stiffening clamps engage the upper terminal formations of the intermediate partition members; and coupling parts on the ends of the stiffening clamps connect to the coupling formations on the top ends of the side walls.