US PATENT SUBCLASS 361 / 46
.~.~.~ With more than two wires

Current as of: June, 1999
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361 /   HD   ELECTRICITY: ELECTRICAL SYSTEMS AND DEVICES

1  DF  SAFETY AND PROTECTION OF SYSTEMS AND DEVICES {32}
42  DF  .~ Ground fault protection {5}
45  DF  .~.~ With differential sensing in a single phase system {1}
46.~.~.~ With more than two wires

DEFINITION

Classification: 361/46

With more than two wires:

(under subclass 45) Subject matter wherein the current going to and returning from the load in a single phase system with more than two wires is compared by a sensing means and a sensed difference activates the protective circuit.