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Ground wires are metallic wires used in overhead power lines to protect the line conductors against lightning. An optical ground wire (OPGW) is composed of an envelope of one or two layers of metallic helical strands wound around a core containing optical fibers. In most OPGW constructions, the fibers are designed to be stress free or to experience only low stresses under normal operation loads. A...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.