Potential indicating device

Details Potential indicating device Potential indicating device

1988-02-25

1989-03-21

Tolin, Gerald P.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 88, 324133, 340660, 340663, G01R 1914

Patent

active

048149330

ABSTRACT:
A potential indicating device for indicating the presence of a voltage on a connector in a high voltage electrical distribution system, the connector including a conductor, a semiconductive shield and a test point terminal. The device comprises two separate indicator circuits, each energized by a different voltage capacitively coupled to the conductor. When a voltage is present in the conductor, first circuit means transmits a voltage capacitively coupled to the test point terminal to a visible indicator which flashes intermittently, and second circuit means transmits a voltage capacitively coupled to the semiconductive shield to an audible indicator when switching means closes the second circuit means. Preferably switching means comprises a photosensitive transistor normally shielded from light by a removable plug.

REFERENCES:
patent: 3513394 (1970-05-01), Tachick
patent: 4251770 (1981-02-01), Schweitzer, Jr.
patent: 4263550 (1981-04-01), Schweitzer, Jr.
patent: 4321543 (1982-03-01), Tuska
patent: 4375617 (1983-03-01), Schweitzer, Jr.
patent: 4438403 (1984-03-01), Schweitzer, Jr.
patent: 4458198 (1984-07-01), Schweitzer, Jr.
patent: 4550282 (1985-10-01), Schweitzer, Jr.

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