Safety circuit for electrical equipment

Details Safety circuit for electrical equipment Safety circuit for electrical equipment

1975-11-07

1977-06-07

Miller, J D

Electrical transmission or interconnection systems

Personnel safety or limit control features

361 49, 361 77, H02H 314

Patent

active

040285944

ABSTRACT:
An electrical control positioned between the power cord and the electrically energized appliance to require a proper ground for the electrical appliance before said apliance can be energized by the actuating switch. A test circuit actuated by the presence of current between the B+ line and ground line prior to actuation of the circuit from the B+ line to the load and to the neutral line requires that the ground line be properly installed before the circuit is closed to the load of the electrical appliance to energize the same and maintain it energized.

REFERENCES:
patent: 2628999 (1953-02-01), Bruyne
patent: 2922925 (1960-01-01), Gerrard
patent: 2999189 (1961-09-01), Gerrard
patent: 3176219 (1965-03-01), Behr
patent: 3413487 (1968-11-01), Gershen
patent: 3426342 (1969-02-01), Langis
patent: 3659152 (1972-04-01), Langis
patent: 3944891 (1976-03-01), McDonald et al.
patent: 3946282 (1976-03-01), Weiss et al.

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