Fail-safe electrical-ground indicator

Details Fail-safe electrical-ground indicator Fail-safe electrical-ground indicator

1985-01-25

1987-02-10

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

340649, G01R 3102

Patent

active

046425543

ABSTRACT:
A fail-safe electrical ground indicator is described which includes apparatus for testing whether a vessel or piece or equipment is adequately grounded. The indicator further includes grounded parallel resistors for checking the integrity of the test apparatus, means for making electrical contact between the test apparatus and each of the resistors one at a time, means for making electrical contact between the test apparatus and both resistors at the same time, means for determining whether an electrical current passing through the test apparatus and each of the resistors separately exceeds a specified value, and means for determining whether an electrical current passing through the test apparatus and all of the resistors exceeds the specified value.

REFERENCES:
patent: 3290668 (1966-12-01), Perretta
patent: 3343154 (1967-09-01), Seesselberg
patent: 3769577 (1973-10-01), Schnur et al.
patent: 3798540 (1974-03-01), Darden et al.
patent: 3825915 (1974-07-01), Dow
patent: 3878458 (1975-04-01), Muska
patent: 3961319 (1976-06-01), Asberry
patent: 4111516 (1978-09-01), Wireman
patent: 4118690 (1978-10-01), Paynton
patent: 4394615 (1983-07-01), Rocci, Jr.

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