(under the class definition) Systems wherein the distributing system for supplying current to the load device has three or more wires with two wires connected to the source of supply so that a desired voltage is maintained between them, the other wires being connected in the system so that the potential between any of these wires and either of the first mentioned two wires is less than the potential between the first mentioned two wires.
(1) Note. This subclass includes, either as originals or cross references, patents relating to systems wherein a load device of the type which is within the class definition can be connected between the two wires of higher potential or between the intermediate wire and one of the higher potential wires so as to impress either a high or low potential on the load device. Also included are patents for supplying current to a plurality of load devices by means of a three wire distribution system.
SEE OR SEARCH THIS CLASS, SUBCLASS:
137, and indented subclasses, for systems wherein the load device is supplied with polyphase alternating current by means of a three or more wire polyphase alternating current distributing system.
160, and indented subclasses, for systems which are provided with a plurality of sources of current supply for one or more load devices.
184, for systems wherein each side of the current supply is connected to two or more conductors, three or more load devices being connected between the two sides of the line, each load device being connected to a different pair of conductors from the conductors connected to the other load devices.
250, and subclass 265, and indented subclass, for systems having an alternating current supply source for the load device or devices and having the load device or devices connected so as to be operative on each half wave of the alternating current cycle. In many of these systems the wires connecting the load device or devices to the alternating current source are arranged so as to constitute a three wire distribution system or to be closely analogous to a three wire distribution system.
