Hazardous voltage protection circuitry

Details Hazardous voltage protection circuitry Hazardous voltage protection circuitry

1978-09-11

1980-03-18

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

179 78A, 307129, 328138, 361113, 361182, H02H 304, H02H 726

Patent

active

041942302

ABSTRACT:
A safety circuit for protective operation at the interface between certain customer premises telephone installations and the external telephone distribution lines. The protection circuit includes a means for discriminating any voltages of sufficient magnitude having a frequency at or near 60 Hz., and upon such detection, a reactance means is responsive to open the connection between the premises telephone installation and the external telephone distribution line.

REFERENCES:
patent: 1377573 (1921-05-01), Fortescue
patent: 3940698 (1976-02-01), Itoh
"A Circuit for Protecting Transister Amplifiers from Extraneous Currents," _Khrennikova, Telecommunication & Radio Eng., vol. 27, No. 2, pp. 36-39, 2/1973.

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