Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1999-03-16
2000-01-11
Gaffin, Jeffrey
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 45, 361 931, 361115, H02H 300
Patent
active
060142979
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 independently interrupt overcurrent conditions 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 for current detection, 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 simultaneously open both poles of 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.
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Clarey Robert J.
Elms Robert Tracy
Sabol Richard P.
Eaton Corporation
Gaffin Jeffrey
Jackson Stephen
Moran Martin J.
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