Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-07-05
1993-11-02
Ng, Jin F.
Communications: electrical
Condition responsive indicating system
Specific condition
340644, G08B 1314
Patent
active
052587444
ABSTRACT:
An annunciator for indicating the removal of an electrical plug from an electrical receptacle. The electrical receptacle includes neutral switching contacts actuated in response to the insertion of a plug into the receptacle. An input circuit in the annunciator apparatus monitors the state of the neutral switching contacts and couples signals produced when a plug is removed to a latching circuit thereby to produce an audible or electrical indication of plug removal. The annunciator circuit does not provide an alarm in response to the insertion of a plug or to an absence of a plug.
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Ng Jin F.
Oda Christine K.
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