Abstract: A rack mounting system for securing electrical apparatus to a pair of telescopic slides or the like, comprising a pair of rigid elongated support plates forming part of or attached to the sliding members of the telescopic slides, said support plates being provided with a plurality of slots and notches opening into the upper edge of the plate, and positioned in such a way as to simultaneously receive and locate two out of a plurality of pins, pulleys or rollers carried by said electrical apparatus and said notches, slots and pins, pulleys or rollers being positioned so as to allow the said apparatus to be positioned in a plurality of orientations on said support plates once the telescopic slides have been extended, and maintained in these orientations through the action of gravity so that the apparatus can only be moved from the selected orientation by a deliberate lifting action, thereby improving access to the apparatus while it remains on the telescopic slides, but allowing the easy removal of the apparatus