A multichannel data network comprising: a cable television device configured to be operatively coupled to a coaxial cable at a point of demarcation, wherein the cable television device is configured to provide a bonded ground path from a ground path conductor element of the coaxial cable to a neutral conductor of an electrical service ground connection ; and a neutral fault voltage detection device (72, 172 372, 472) configured to detect a voltage potential in a ground path conductor element of a coaxial cable in a multichannel data network, the neutral fault voltage detection device comprising: a coupling element configured to be coupled to the ground path conductor element of the coaxial cable ; a passive voltage sensing circuit configured to be coupled to the coupling element, and detect a neutral fault voltage potential in the ground path conductor element of the coaxial cable when the coupling element is positioned to engage the ground path conductor element; and a passive neutral fault alert device configured to be coupled to the voltage sensing circuit, and generate a neutral fault condition alert when the voltage sensing circuit detects the neutral fault voltage potential in the ground path conductor element of the coaxial cable; characterized in that the passive voltage sensing circuit is powered only by the detected neutral fault voltage potential in the ground path conductor element of the coaxial cable; the neutral fault alert device is powered only by the detected neutral fault voltage potential in the ground path conductor element of the coaxial cable, and only after the passive voltage sensing circuit detects the neutral fault voltage potential; the ground path comprises a ground wire connecting an outer conductor of the coaxial cable to an electrical service ground connection , the coupling element configured to couple with the ground path conductor element at a location on the ground path; and the coupling element comprises a secondary transformer coil configured to be coupled to a primary transformer coil, wherein the primary transformer coil is the outer conductor sheath of the coaxial cable . a coupling element configured to be coupled to the ground path conductor element of the coaxial cable ; a passive voltage sensing circuit configured to be coupled to the coupling element, and detect a neutral fault voltage potential in the ground path conductor element of the coaxial cable when the coupling element is positioned to engage the ground path conductor element; and a passive neutral fault alert device configured to be coupled to the voltage sensing circuit, and generate a neutral fault condition alert when the voltage sensing circuit detects the neutral fault voltage potential in the ground path conductor element of the coaxial cable; characterized in that the passive voltage sensing circuit is powered only by the detected neutral fault voltage potential in the ground path conductor element of the coaxial cable; the neutral fault alert device is powered only by the detected neutral fault voltage potential in the ground path conductor element of the coaxial cable, and only after the passive voltage sensing circuit detects the neutral fault voltage potential; the ground path comprises a ground wire connecting an outer conductor of the coaxial cable to an electrical service ground connection , the coupling element configured to couple with the ground path conductor element at a location on the ground path; and the coupling element comprises a secondary transformer coil configured to be coupled to a primary transformer coil, wherein the primary transformer coil is the outer conductor sheath of the coaxial cable . <EOS>