NASA NTRS · 19800000002
Simple circuit monitors "third wire" in ac lines
Abstract
Device detects interruption of ground connection in three-wire electrical equipment and shuts off ac power to prevent shock hazard. Silicon-controlled rectifiers detect floating ground, and deenergize optoelectric relays thereby breaking power connections. Circuit could be incorporated into hand tools, appliances, and other electrical equipment.
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Kojima, T. T., Stuck, D. E.. 1980-08-01. Simple circuit monitors "third wire" in ac lines. https://ntrs.nasa.gov/citations/19800000002
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