If we check the history of electric cables, the real demand for wires and Cables to conduct electric power began in 1871, with the invention of the first dependable dynamo. The telegraph and telephone swelled demand for efficient methods of transmitting electric current and signals over long distances. The insulation back in the days was paper coated. Just imagine Paper-coated pitch wrapped each individual wire, insulating it from the others. The whole batch was then wrapped in paper. Some even suggested laying these batches in tubes coated in resin and placing them underground to keep curious young boys away from them. In the case of cables, factors like resistance, capacitance and impedance all play a role. There's also a great many more electrical sources , magnetic sources and broadcast radio frequencies today than there were in the days of paper and pitch insulation. All of these factors can affect a cable's transmission. As a result, shielding is another impo...
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