Electrical ground fault detecting device

Details Electrical ground fault detecting device Electrical ground fault detecting device

1974-08-23

1977-02-01

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 725, 324133, G01R 3102, G01R 1916

Patent

active

040064093

ABSTRACT:
A self-contained, hand-held device for detecting ground fault to the housing or casing of AC energized electrical equipment, appliances, tools or building wiring is described. A metal probe at one end of the device held against the conductive housing or casing of the equipment to be tested for ground fault applies, under ground fault conditions, a capacitively induced signal voltage to the conductive equipment housing in contact with the input circuit of the device operative to energize an output circuit including an indicator presenting a visual indication of ground fault.

REFERENCES:
patent: 2109189 (1938-02-01), Bly
patent: 2156319 (1939-05-01), Steele
patent: 2164148 (1939-06-01), Swanson
patent: 2942189 (1960-06-01), Shea et al.
patent: 3009099 (1961-11-01), Muller
patent: 3183439 (1965-05-01), Rosinek
patent: 3204183 (1965-08-01), Hasenzahl
patent: 3437928 (1969-04-01), Baker et al.
patent: 3774110 (1973-11-01), Roveti
patent: 3828256 (1974-08-01), Liu
patent: 3863149 (1975-01-01), Johnson
patent: 3878459 (1975-04-01), Hanna
patent: 3919631 (1975-11-01), Brown
Plummer, J. W., Probe for Quickly Checking `0` and " 1" States in a Logic Circuit, Electronic Engineering, p. 614, Nov. 1968.

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