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The way copper wires are twisted around one another also has an effect on data rates. Category 3 cable (Cat3), has three to four twists per foot and can support speeds of 10 Mbit/s. [1] Category 5 cable (Cat5) is newer and has three to four twists per inch, which results in a maximum data rate of 100 Mbit/s. [1]
Above-ground lines cost around $10 per 1-foot (0.30 m) and underground lines cost in the range of $20 to $40 per 1-foot (0.30 m). [10] In highly urbanized areas, the cost of underground transmission can be 10–14 times as expensive as overhead. [11] However, these calculations may neglect the cost of power interruptions.
An example of a copper alloy conductor is cadmium copper wire, which is used for railroad electrification in North America. [5] In Britain the BPO (later Post Office Telecommunications ) used cadmium copper aerial lines with 1% cadmium for extra strength; for local lines 40 lb/mile (1.3 mm dia) and for toll lines 70 lb/mile (1.7 mm dia).
A 189 strand count wire has a cross-sectional area of 1.5 mm 2 which equates to 126.7 strands per ... cost C10200 Oxygen-Free (OF) copper wire in speaker cable ...
In land-based wind farms, copper intensity can range between 5,600 and 14,900 pounds per MW, depending on whether the step-up transformers have copper or aluminium conductors. In the off-shore environment, copper intensity is much higher: approximately 21,000 pounds per MW, which includes submarine cables to shore. [ 47 ]
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