Importance

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Abstract

Safety apparatus for indicating a live voltage condition in an insulated electrical conductor having insulation surrounding a central conductor wire, comprises: a layer of semi-conducting tape on the outer surface of the insulation; an electrically conductive sheath consisting of a plurality of turns of wire on the outer surface of the semi-conducting tape; a layer of stress-relieving tape wrapped about each end of the semi-conducting tape and an adjacent portion of the insulation; and an outer layer of electrical insulating tape covering all the previously-described tape layers and the turns of wire which are connected to ground through a fluorescent tube. When the insulated electrical conductor is subjected to live alternating current energization at 7000 volts or more, a capacitive alternating current path is established across the insulation, between the central conductor wire and the turns of wire acting as capacitor plates, to light the fluorescent tube.

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First Claim