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2. Copper conductor - Wikipedia

   en.wikipedia.org/wiki/Copper_conductor

   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).

3. Overhead line - Wikipedia

   en.wikipedia.org/wiki/Overhead_line

   For the contact wire, cold drawn solid copper was used to ensure good conductivity. The wire is not round but has grooves at the sides to allow the hangers to attach to it. Sizes were (in cross-sectional area) 85, 100, or 150 mm 2. To make the wire stronger, 0.04% tin might be added.

4. Wire - Wikipedia

   en.wikipedia.org/wiki/Wire

   Stranded copper wire. Stranded wire is composed of a number of small wires bundled or wrapped together to form a larger conductor. Stranded wire is more flexible than solid wire of the same total cross-sectional area. Stranded wire is used when higher resistance to metal fatigue is required.

5. AT&T to eliminate copper wire phone lines to most users. Who ...

   www.aol.com/t-eliminate-copper-wire-phone...

   The AT&T copper wire network is 70 years old and it's becoming increasingly unreliable, said Johnson. It doesn't do well in water or during storms and "copper value is up, so we are experiencing a ...

6. Aluminum building wiring - Wikipedia

   en.wikipedia.org/wiki/Aluminum_building_wiring

   Most of the problems related to aluminum wire are typically associated with older (pre-1972) AA-1350 alloy solid aluminum wire, sometimes referred to as "old technology" aluminum wiring, as the properties of that wire result in significantly more expansion and contraction than copper wire or modern day AA-8000 series aluminum wire. Older solid ...

7. Twin-lead - Wikipedia

   en.wikipedia.org/wiki/Twin-lead

   It is constructed of two, stranded copper wires, or solid copper-clad steel wires. The wires are held a fixed distance apart by a plastic ribbon that is a good insulator at radio frequencies (usually polyethylene). It is also called (two wire) ribbon cable. The uniform spacing of the wires is the key to the cable's function as a transmission ...