초록 ▼

A circuit is disclosed for disconnecting a power source upon the detection of a leakage current comprising a power cable having an insulated first and a second wire. The power cable has a conductive shield surrounding the first and second wires with a drain wire electrically contacting the conductiv

A circuit is disclosed for disconnecting a power source upon the detection of a leakage current comprising a power cable having an insulated first and a second wire. The power cable has a conductive shield surrounding the first and second wires with a drain wire electrically contacting the conductive shield. A disconnect switch is interposed between the power source and the power cable. A primary circuit controls the disconnect switch. A secondary circuit is connected to the drain wire for sensing a leakage current between the conductive shield and one of the first and second wires. An optical switch interconnects the primary circuit and the secondary circuit for opening the disconnect switch upon the secondary circuit sensing a leakage current.

대표청구항 ▼

What is claimed is: 1. A circuit for disconnecting a power source upon the detection of a leakage current, comprising:a leakage current circuit comprising a disconnect switch;a power cable connected to the power source though said disconnect switch;said power cable consisting of:a. a first insulated

What is claimed is: 1. A circuit for disconnecting a power source upon the detection of a leakage current, comprising:a leakage current circuit comprising a disconnect switch;a power cable connected to the power source though said disconnect switch;said power cable consisting of:a. a first insulated wire and a second insulated wire;b. an insulated ground wire;c. a conductive shield surrounding all of said first and second insulated wires and said insulated ground wire;d. a drain wire having a first and a second portion with said first portion of said drain wire being in contact with said conductive shield; ande. an outer insulating layer disposed about said conductive shield and said first portion of said drain wire; anda conductor connecting said second portion of said drain wire to said leakage current circuit for opening said disconnect switch upon said leakage current circuit sensing a leakage current between said conductive shield and one of said first and second insulated wires and said insulated ground wire to disconnect said power cable from the power source.