He wanted to avoid low voltage bulbs, because the cost of the enormous copper conductors would have made it financially non-competitive with gas lighting . ( Matthew Josephson, " Edison : a biography . " McGraw Hill.
32.
The copper conductors would have had to be larger in cross section to supply the same watts, resulting in higher cooper costs to wire a building, unless multiple transformers were used, which could result in high transformer costs.
33.
Solid aluminum conductors were originally made in the 1960s from a utility grade aluminum alloy that had undesirable properties for a building wire, and were indiscriminately used with wiring devices intended for copper conductors and often poorly installed.
34.
Aside from PVC insulation that is only rated to operate to about 60 �C, therefore, the current in such wires must be limited so that it never heats the copper conductor above 60 �C, causing a risk of fire.
35.
As the name implies, a barrier metal must have high electrical conductivity in order to maintain a good electronic contact, while maintaining a low enough copper diffusivity to sufficiently chemically isolate these copper conductor films from underlying device silicon.
36.
Telecommunications power cable products, as described in Telcordia GR-347, consist of a stranded copper conductor used in AC / DC circuits up to 600 V that are insulated with non-halogen, limited smoke, polyolefin materials that are heat-resistant, moisture-resistant, and flame-retardant.
37.
The 1880 vintage Edison lamp was suitable for operation from a generating plant a mile or so away, without having an impractically high cost for the copper conductors to get the current from the generator to the lamps in the district.
38.
When welding copper conductors, the process employs a semi-permanent graphite crucible mould, in which the molten copper, produced by the reaction, flows through the mould and over and around the conductors to be welded, forming an electrically conductive weld between them.
39.
Now there is more interest in superconducting rotor ( rotating member ) use superconductors but the alternating current multiphase winding set on the stator ( stationary members ), which have no practical support by superconductors, uses conventional, normal conduction copper conductors.
40.
A short link of it would melt and interrupt the current when there was a short or a sever overload, before the copper conductors could overheat and start a fire . talk ) 04 : 18, 19 December 2010 ( UTC)
