Ground assurance circuit

Details Ground assurance circuit Ground assurance circuit

1982-03-15

1985-03-19

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340651, 340652, 361 49, 361 50, G08B 2100

Patent

active

045062609

ABSTRACT:
A bi-directional system for ensuring that a ground connection is made in a three-wire conductor system including a line "hot" conductor, a line neutral conductor, and a ground conductor includes a circuit for generating direct current potential related to the potential difference between the line "hot" conductor and ground and a second circuit for generating a direct current potential related to the potential difference between the line "hot" conductor and ground. A circuit including a male plug for insertion into a female receptacle includes a first prong for coupling alternatively to the line "hot" conductor or the line neutral conductor, a second prong for coupling alternatively to the line "hot" conductor or the line neutral conductor, and a third prong for coupling to the line ground conductor. Coupling of the first prong to the line "hot" conductor causes the second prong to be coupled to the line neutral conductor and coupling of the first prong to the line neutral conductor causes the second prong to be coupled to the line "hot" conductor. Conductors are provided for coupling the first circuit to the first and third prongs and for coupling the second circuit to the second and third prongs. Each of the first and second circuits includes a Zener diode for sensing the potential across the "hot" and ground conductors and for switching in response to the presence of potential difference, which tends to indicate the presence of ground potential on the ground conductor.

REFERENCES:
patent: 3386004 (1968-05-01), Dwyer
patent: 3419756 (1968-12-01), Philibert et al.
patent: 3914656 (1975-10-01), Hirschhorn et al.

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