In all-copper homes, copper conductors are used in circuit breaker panels, branch circuit wiring ( to outlets, switches, lighting fixtures and the like ), and in dedicated branches serving heavy-load appliances ( such as ranges, ovens, clothes dryers and air conditioners ).
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Insulation thickness or type also has no audible effect as long as the insulation is of good quality and does not chemically react with the wire itself ( poor-quality insulation has occasionally been found to accelerate oxidation of the copper conductor, increasing resistance over time ).
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For example, at 60 Hz, a 2000 MCM ( 1000 square millimetre ) copper conductor has 23 % more resistance than it does at DC . The same size conductor in aluminum has only 10 % more resistance with 60 Hz AC than it does with DC.
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So a 1 / 3 inch piece of small diameter low melting point alloy, like fine solder, will carry an amount of current without melting which an insulated copper conductor can carry without exceeding the rating of the copper ( say 15 amps for number 14 copper ).
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Even though an aluminum conductor must have about a 50 % greater cross-sectional area than a copper conductor to carry the same current, aluminum wire has half the unit weight of copper, resulting in cables with aluminum wires having a lower weight per foot than cables with copper wires.
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The thickness of the barrier film is also quite important; with too thin a layer, the copper contacts poison the very devices that they connect to; with too thick a layer, the stack of two barrier metal films and a copper conductor have a greater total resistance than aluminium interconnects, eliminating any benefit.
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"' Hybrid fibre-optic "'is the connection used by some television studio and field production video cameras that combine all video, audio, data, control, power, and other signals onto two single mode optical fibres and a few copper conductors in one jacket, allowing one cable to provide all the necessary signals a camera needs for the television production environment.
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