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History of power cables
Early telegraph systems used the first forms of electrical cabling, transmitting tiny amounts of power. Gutta-percha insulation used on the first submarine cables was, however, unsuitable for building wiring use since it deteriorated rapidly when exposed to air.
The first power distribution system developed by Thomas Edison in 1882 in New York City used copper rods, wrapped in jute and placed in rigid pipes filled with a bituminous compound. Although vulcanized rubber had been patented by Charles Goodyear in 1844, it was not applied to cable insulation until the 1880s, when it was used for lighting circuits. Rubber-insulated cable was used for 11,000 volt circuits in 1897 installed for the Niagara Falls power project.
Mass-impregnated paper-insulated medium voltage cables were commercially practical by 1895. During World War II several varieties of synthetic rubber and polyethylene insulation were applied to cables.
Typical residential and office construction in North America has gone through several technologies:
Early bare and cloth-covered wires installed with staples
Knob and tube wiring, 1880s-1930s, using asphalt-saturated cloth or later rubber insulation
Armored cable, known by the genericized trademark "Bx" - flexible steel sheath with two cloth-covered, rubber-insulated conductors - introduced in 1906 but more expensive
Rubber-insulated wires with jackets of woven cotton cloth (usually impregnated with tar), waxed paper filler - introduced in 1922
Early two-wire PVC-insulated cable, known by the genericized trademark "Romex", 1950s
Aluminum wire was used in the 1960s and 1970s as a cheap replacement for copper, but this is now considered unsafe due to corrosion
Asbestos was used as an Insulator (electricity) in some cloth wires from the 1920s to 1970s.
Modern three-wire PVC-insulated cable, also known as "Romex" - see thermoplastic-sheathed cable
Electrician - increasingly also computer science
Electrical installations, especially those which will be installed in buildings with complicated structures often require the creation of a very difficult project. Special computer programs enable electricians much easier to plan where and how they will run the wire, where will be located branch and so on. In this way, more and more electricians may remind us of specialists, because the design of electrical networks at the present time is done properly only through the computer. Special programs also allow control of parameters during operation of the installation.
Where to find help regarding problems with electricity?
The virtual network is a source of information of all kinds, and this is primarily due to the fact that anyone who has access to the Internet, you can actually write anything there. When it comes to electrical services, this issue looks the same. The Internet is full of advice relating to self-repair minor faults. If they do not come from a known source, however, we should not make major repairs on their own. Websites specific electricians also contain different advice, but here they concern primarily the need to call an electrician. It may turn out that insufficiently tightened the fuse will make that we will be deprived of light, and for such a trifle is not worth it to call professional help.