(under subclass 276) Systems wherein the transformer is of the type having three or more coils or windings.
(1) Note. This subclass does not include systems provided with transformers having only a primary and secondary coil with one or both of the coils tapped, but the transformer used in the system must have three or more separate coils, although two or more of the coils may be connected in series, usually so that the current flow through one of the series connected coils flows in the opposite direction to the current flow through the other series connected coil.
SEE OR SEARCH THIS CLASS, SUBCLASS:
257, for plural load device systems under the class definition having a plural secondary or tapped secondary transformer in the supply circuit.
282, for such systems having tapped coils.
SEE OR SEARCH CLASS
323, Electricity: Power Supply or Regulation Systems, 249, 302, 310, 329, and 355, for miscellaneous transformer systems and for transformer systems for controlling the magnitude of the current and/or voltage in a single circuit where the transformer has an auxiliary saturating winding.
336, Inductor Devices, appropriate subclasses for the structure of transformers and inductive reactors including those with three or more coils or windings.
