(under the class definition) Systems provided with at least two sources of electrical energy and at least one load device, and provided with means for supplying energy to operate a load device from one of the sources of electrical energy while the other source of electrical energy is maintained in a nonsupplying condition, and having means which operate automatically in response to some condition affecting the operation of the system to connect the nonsupplying source of energy in the system so that it can become operative to supply energy to either the same load device or a different load device than the load device supplied by the first operated source of electrical energy.
(1) Note. The condition which causes the second operated source of energy to be connected in the system may be any one or any combination of (1) the failure of the first operated source of energy to deliver sufficient energy to a load device, (2) an abnormal rise in voltage or current output of the first operated source of energy, (3) when the second operated source of energy has attained a sufficient voltage and current output to supply the load device with energy, (4) any other condition affecting the operation of the system which makes it desirable that a source of energy other than the first operated source of energy be used to supply a load device.
(2) Note. This and the indented subclass are not restricted to gas or vapor discharge devices or electric lamps as the load device, but includes all discharge device systems provided with means to automatically substitute another source of current supply for the source of current supply which is first used to supply current, excepting such systems in which the discharge device load is a discharge control type gas or vapor discharge device and the system includes means to supply current and/or potential to the discharge control means.
(3) Note. This subclass does not include systems wherein the one source of energy is a storage battery designed to be charged from the other source of energy, and to be connected to supply the load device when the other source of energy becomes inactive. Such systems are considered to be systems which include the battery as a load device and will be found for the most part in Class 307, Electrical Transmission or Interconnection Systems, subclasses 46, 48+ and 66+, and Class 320, Electricity: Battery or Capacitor Charging or Discharging, having a battery charging and/or discharging,
per se, many patents disclosing, but not claiming an additional lamp or discharge device load.
SEE OR SEARCH THIS CLASS, SUBCLASS:
119, and indented subclasses for systems under the class definition provided with means automatically operating to either complete a shunt circuit about the load device or to open the circuit of the load device, the automatically operating means being operated in response to some condition which prevents further normal operation of the load device. 160, and indented subclasses for other systems under the class definition provided with two or more sources of current supply.
SEE OR SEARCH CLASS
307, Electrical Transmission or Interconnection Systems, see (3) Note.
