WILLIAM G CLARK
Funeral Home and Crematory in Bedford, MA
License number
Massachusetts 5006
Expiration Date
Oct 31, 1995
Type
Type 3 Funeral Director and Embalmer
Address
Address
Bedford, MA 01730
Professional information
Selective Tripping Of Two-Pole Ground Fault Interrupter
US Patent:
3944888, Mar 16, 1976
Filed:
Oct 4, 1974
Appl. No.:
5/512106
Inventors:
William R. Clark - Bedford MA
Assignee:
I-T-E Imperial Corporation - Spring House PA
International Classification:
H02H 328
US Classification:
317 18D
Abstract:
A ground fault detector-interrupter for a single phase three wire electrical system includes a polarity sensitive fault detector controlling a gate in a manner such that only the hot line that has a ground fault will be interrupted.
False Triggering Protection For Ground Fault Sensor
US Patent:
3976918, Aug 24, 1976
Filed:
Oct 4, 1974
Appl. No.:
5/512211
Inventors:
William R. Clark - Bedford MA
Assignee:
I-T-E Imperial Corporation - Spring House PA
International Classification:
H02H 328
US Classification:
317 18D
Abstract:
A ground fault detector-interrupter, including a differential transformer for detecting the difference between currents in the hot and neutral conductors connecting a load to an a. c. source, is provided with a resistor shunting the differential transformer primary winding in series with the hot conductor. By shunting part of the current in the hot primary around the differential transformer, the transformer is effectively desensitized under high in-rush current conditions to protect against false triggering that would normally be caused by non-uniformity in the transformer windings and/or less than precise placement of transformer leads.