Abstract: A demand controller for connecting and disconnecting loads from a power source has a plurality of control elements in two priority groups, an equal priority group and a set priority group. Loads are controlled by the control elements to be connected and disconnected. A control means directs signals for restoring and shedding the loads and for the priority between the two groups of control elements.

Abstract: The material consists of a mixture of silver and 1.0 to 20 weight per cent of lanthanum, strontium chromite of the formula La.sub.1.sub.-x Sr.sub.x CrO.sub.3, where the values of x lie between 0 and 1.0. The addition of 2.5 to 20 weight per cent of cadmium oxide further improves the electrical contact material by providing anti-weld properties to the contact interface. The electrical contacts are formed from the contact material by powder metallurgy techniques.

Abstract: The fitting is mountable on a cellular steel floor or deck prior to pouring of the concrete of a completed floor and comprises a separable flat base plate, a box-like housing, and a cover plate. Two self-grommeted openings in the base plate are axially aligned with respective openings of substantially equal size leading to adjacent cells of the deck, and a tab on the base plate at one of the grommeted openings interlocks with the deck to hold the base plate in position. Horizontally directed slots formed in the base plate along one longitudinal edge thereof cooperate selectively with tabs on the lower longitudinal edges of the housing to lock the housing on the base plate selectively in either of two positions. Screws or rivets may be used as additional fastening means for the base plate and housing.