US PATENT SUBCLASS 700 / 294
.~.~.~ Abnormal phase, waveform, or polarity condition


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700 /   HD   DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS

90  DD  SPECIFIC APPLICATION, APPARATUS OR PROCESS {16}
286  DD  .~ Electrical power generation or distribution system {5}
292  DD  .~.~ System protection (e.g., circuit interrupter, circuit limiter, voltage suppressor, etc.) {2}
294.~.~.~ Abnormal phase, waveform, or polarity condition