Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1997-06-18
1998-08-11
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 45, 361 49, 361107, 333206, H02H 318
Patent
active
057935904
ABSTRACT:
A coaxial drop cable safety device is used for cable television, data and telephony applications. The device is used on buried drop cable where 60 Hz powering voltages applied to the drop cable exceed low voltage safety limits and where the drop cable is buried at depths which is less than the minimum required to meet electrical safety codes. Tap end and premise end units are connected to the drop cable. The tap end unit applies a DC voltage to the center conductor of the drop cable. A monitoring circuit in the tap end unit monitors the center conductor DC voltage to a fault from the center conductor to ground along the drop cable. The tap unit will immediately remove the powering voltage In the event of either an open or faulted condition on the center conductor along the entire length of the drop cable. Additionally, while providing fault protection for the low frequency powering circuit due to tampering or damage to the cable, the fault monitoring circuit allows the high frequency television, data and telephony signals to pass with little or no impediment.
REFERENCES:
patent: 3576469 (1971-04-01), McNitt et al.
patent: 4099217 (1978-07-01), Fitchew
patent: 4987391 (1991-01-01), Kusiak, Jr.
patent: 5053910 (1991-10-01), Goldstein
Chamberlain John C.
Sniezko Oleh J.
Sontag Kenneth N.
Vokey David E.
Gaffin Jeffrey A.
Norscan Instruments Ltd.
Sherry Michael J.
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