Apparatus for detecting arcing faults and ground faults in multi

Details Apparatus for detecting arcing faults and ground faults in multi Apparatus for detecting arcing faults and ground faults in multi

1997-09-29

1999-03-30

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361115, H02H 300

Patent

active

058896430

ABSTRACT:
A multiwire branch circuit including two line conductors and a grounded, common neutral conductor is protected by a two pole circuit breaker connected to interrupt current flow in the two ungrounded line conductors. Three separate protection circuits provide arc fault protection for each of the ungrounded line conductors and ground fault protection for all three conductors. The arc fault detectors use the bimetal of the thermal-magnetic trip device for the associated line conductor, and therefore, are individually referenced to the associated line voltage. Hence, the outputs of the arc fault detectors are electrically isolated from each other and from the output of the ground fault detector, but operate a common trip circuit to open the two pole circuit breaker. The arc fault detectors have separate isolated power supplies. The ground fault detector is powered by a supply which is energized if either of the ungrounded line conductors is energized.

REFERENCES:
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5307230 (1994-04-01), MacKenzie
patent: 5459630 (1995-10-01), MacKenzie et al.
patent: 5519561 (1996-05-01), Mrenna et al.
patent: 5546266 (1996-08-01), MacKenzie
National Electrical Code Handbook, 1996, Article 210.4 Multiwire Branch Circuits, pp. 54-55.

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