Fault detection circuit and method for testing a multiple conduc

Details Fault detection circuit and method for testing a multiple conduc Fault detection circuit and method for testing a multiple conduc

1992-07-27

1993-06-08

Harvey, Jack B.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of individual circuit component or element

324539, 324542, 324509, G01R 3102

Patent

active

052183076

ABSTRACT:
A fault detection circuit for testing conductor-to-conductor and conductor-to-ground faults in multiple conductor shielded cables. The fault detection circuit includes a voltage source that provides a plurality of distinct voltage phases. Each distinct phase from the voltage source is connected through a resistance and a logic circuit to an individual conductor in the cable. The resistance limits the current flowing through the fault detection circuit to reduce the risk of electrical shock to the operator. The logic circuit includes control relays which are responsive to phase-to-phase or phase-to-ground faults in the cable conductors. The logic circuit also provides a visual indication of a fault in the cable.

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patent: 3600673 (1971-08-01), Kohke
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patent: 3736503 (1973-05-01), Coleman et al.
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U.L. Specification #1569, pp. 34-35 The Underwriters Laboratories, Inc., Jul. 1983.

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