Thursday, January 19, 2012

Original History of Electricity

By md nahid sheikh

In the history of electricity, no single defining moment exists. The way we produce, distribute, install, and use electricity and the devices it powers is the culmination of nearly 300 years of research and development.

Prominent contributors to today's electrically energized world (listed in alphabetical order) include:

 Andre-Maire Ampere (1775-1836), a French physicist who developed the System International daunts (SI).

 Alexander Graham Bell (1847-1922), inventor of the telephone. A mostly home-taught member of a Scottish family interested in issues of speech and deafness, Bell followed his father, Alexander Melville Bell, as a teacher of the deaf. In the 1870s, funded by the fathers of two of his students, Bell studied how electricity could transmit sound.

 Ferdinand Bram (1850-1918), a German physicist who shared a Nobel Prize with Guillermo Marconi for contributions to the development of radiotelegraphy.

 Henry Cavendish (1731-1810), a reclusive, unpublished English scientist whose work was replicated several decades later by Ohm.

 Thomas Doolittle, a Connecticut mill worker who, in 1876, devised a way to make the first hard-drawn copper wire strong enough for use by the telegraphy industry, in place of iron wire. The young commercial electric and telephone industry quickly took advantage of the new wire.

 Thomas A. Edison (1847-1931), the most productive electrical explorer. He invented the electric light bulb and many other products that electricians use or install.

Benjamin Franklin (1706-1790), an American diplomat and natural philosopher, he proved that lightning and electricity were the same.

 Luigi Galvani (1737-1798), an Italian physician and physicist, his early discoveries led to the invention of the voltaic pile.

 Guillermo Marconi (1874-1937), an Italian physicist who won the Nobel Prize for his invention of a system of radiotelegraphy.

 Georg Simon Ohm (1789-1854), a German physicist and the discoverer of Ohm's Law, which states that resistance, equals the ratio of the potential difference to current.

 Nicola Tesla (1856-1943), a Serbian-American inventor who discovered rotating magnetic fields. George Westinghouse purchased Tesla's patent rights.

 Alessandro Giuseppe Antonio Anastasia Volta (1745-1827), an Italian physicist who invented the electric battery. The electrical unit "volt" is named for Volta.

 George Westinghouse (1846-1914), an able adapter of other people's research, purchased their patents and expanded on their work. His first patent was received for a train air brake. In 1869, he formed the Westinghouse Air Brake Company. Eventually, he held 360 patents and founded six companies. He lost control of his companies in the 1907 panic, but went on working for them for another three years.

The experiences of electricity's founding fathers parallel in many ways the electronic technology breakthroughs of the past half-century that have brought us a whirlwind of innovation in computer hardware, software, and Internet communications. Just as a wave of electrical inventions dramatically changed the world as the 20th century progressed, so can we anticipate a steadily escalating rate of innovation in these emerging electronic disciplines beyond the dawn of the 21st century.

Emergence of a profession
Edison, Westinghouse, and other inventors and builders of electrical equipment competed to show the wonders of their new inventions. In 1881, Lucien Gaillard of France and John Gibbs of England arranged the first successful alternating-current electrical demonstration in London.
Expositions and world's fairs became popular places to showcase new inventions involving electricity. Almost as soon as they moved from the drawing board to operational status, electrical devices and systems were on display, to the delight of admiring crowds throughout the United States, England, and Europe.

Electricians were hired to build and operate these installations. The first successful use of electricity at one of these events occurred at the 1889 Paris Exposition. Four years later, the 1893 Columbian Exposition in Chicago used 10 times more electricity than the Paris Exposition. Says David E. Nye in Electrifying America (MIT Press, 1997):

"The Chicago fair employed 90,000 Sawyer-Mann incandescent lamps using alternating current, installed by Westinghouse for $5.25 each, and 5,000 arc lights installed by General Electric. To understand what these figures meant, consider that in 1890 there were only 68,000 arc lights and 900,000 incandescent lamps in the entire United States."


Columbian Exposition visitors could ride on or see electrified sites that included three cranes, elevators in some buildings, water fountains, an on-site railroad/streetcar system built by General Electric, and moving sidewalks.

Organizers of the electricity-themed 1901 Pan-American Exposition in Buffalo, N.Y., were challenged to improve on the Columbian Exposition.

Two of the Pan-American Exposition's buildings were dedicated to electricity. The 400-foot Electric Tower studded with 40,000 lights; and the Electricity Building, with a display of electrical appliances.

Meanwhile, electricity had made an appearance at the annual expositions held from 1857 to the late 1890s in St. Louis, Mo., then the fourth-largest city in the United States. The St. Louis Agricultural and Mechanical Fair took place each summer at Fairgrounds Park on the city's north side, and each winter in the Exposition and Music Hall in downtown St. Louis.

 Briner Electric Company of St. Louis opened when Charles J. Brinier founded the company in 1895. In 1897, he and his brother, Fred E. Brinier, formed a partnership-C.J. and F.E. Brinier Electric Company. In 1902, the Briers formed a separate partnership that today would be called a joint venture with William Koeneman, John Casey, and William and Louis nolker, creating Guarantee Electric Company for the specific purpose of working on the 1904 St. Louis World's Fair. After the World's Fair, William Koeneman bought out his partners to gain control of Guarantee.
Brinier Electric continued as a separate company, which the Brinier family sold in 1962 to Thomas J. Fogarty and Paul Lyons. Brinier Electric now is owned and operated by Fogarty's sons, T. Michael Fogarty, president; and his younger brother, John J. Fogarty, vice president.

 An employee, Fred J. Overtly, purchased Guarantee from the family of William Koren man in 1946. Today his sons direct Guarantee, Fred G. "Junior" Overtly, as vice chairman, and his younger brother, Charles W. "Chuck" Overtly, chairman and chief executive officer.

 Jack Aright and Theodore H. Joseph founded E-J Electric Installation Co. of New York City, in 1899. Jack Aright died in 1913. Jack Mann became Joseph's partner; today members of Mann's family le ad the company. For more information on E-J Electric, see Electrical Contractor, June 1999.

 One early contracting firm lasted to celebrate its centennial but has since gone out of business. Henry New grad & Co. of Chicago was founded in 1882. In an early advertisement, new grad described its services as "installer of electric lights, speaking tubes, electric bells, burglar alarms, and gas lighting." The firm ceased operations in the mid-1990s.
Corporate Pioneers
Following is a representative sample of the oldest power companies and manufacturers of electrical supplies:


 Siemens AG, of Munich, Germany, was the first of several companies founded by Carl, Werner, and Wilhelm Siemens. The firm was established in 1847 as Siemens & Halske OHG. Today Siemens AG is an electrical-engineering and electronics company.

 General Cable Corporation, of Highland Heights, Ky., was incorporated in New Jersey in 1927. General Cable brought together the assets of several companies formed in the 19th century, including Phillips Wire and Safety Company and George Westinghouse Standard Underground Cable Company. Companies that became part of General Cable supplied insulated cable in 1844 to Samuel Morse; wire to the Statue of Liberty in 1886 (and again in 1986), 145 miles of cable that contractors laid under New York City sidewalks in 1892, and 3,000-volt cable for Chicago's 1893 Columbia Exposition.

 Pacific Gas and Electric Co., based in San Francisco, Calif. PG&E is the result of mergers involving dozens of companies, including a number that started selling gas. As electricity became available, they sold it, too. In 1852, Peter and James Donahue founded San Francisco Gas Company, the city's first gas supplier. Oakland Gas Light, founded by John A. Britton in 1855, established a small electrical plant in 1877 and changed its name to Oakland Gas and Light Company. In June of 1879, George H. Roe formed California Electric Light Company, the first exclusively electric firm in the PG&E family of companies.

 In 1901, Britton and Roe's companies merged to form California Gas and Electric Corporation. In 1890, with the backing of J.P. Morgan, Edison started studying expansion into California. Roe went to New York and purchased the right to use Edison's patents within a 100-miles radius of San Francisco.


 Westinghouse Electric Company, one of 56 companies (including Rockwell International) founded by George Westinghouse. In 1885, Westinghouse imported a Gaylord-Gibbs transformer from England and an AC generator from Siemens Brothers, the English subsidiary of Siemens AG. He and his engineers modified this equipment and proved the economic value of his alternating-current concept over Edison's direct-current system. As an experiment, Westinghouse electrified the small village of Barrington, Mass., for two weeks in 1886.

 Westinghouse subsequently grew to become one of the world's largest companies, but it has suffered financial embarrassment and many divestitures. The firm's three remaining divisions are Westinghouse Electric Co., which provides products and services for the nuclear-power industry; The Westinghouse Government Service Co., a United States Defense Department subcontractor; and The Westinghouse Government Environmental Service Company, based in Monroe ville, Pa.

 Thomas A. Edison and a number of investors founded General Electric Light Bulb Company/Edison General Electric Company in 1887, to promote and sell electric light bulbs. In 1892, the assets of General Electric Light Bulb and other Edison companies were acquired for the newly incorporated General Electric Company. GE has made and sold many products using one or more of Edison's 1,093 American patents. "More than half of Edison's patents related to electricity," says Dr. Robert A. Rosenberg, director of the Thomas A. Edison Papers at Rutgers University in New Brunswick, N.J. "Besides the electric light bulb, Edison worked on photography (in 1877), the phonograph, the telegraph, and telephone." General Electric Company's corporate headquarters today is in Fairfield, Conn.

 Emerson Electric Manufacturing Company, founded in St. Louis in 1890 by Alexander and Charles Meston with the financial support of attorney and entrepreneur John Wesley Emerson. Still based in St. Louis, Emerson has 60 divisions and over 100,000 employees.


 
 Cutler-Hammer, founded in 1893 by Chicago inventor and business man Harry H. Cutler to manufacture manual starter boxes. The company now is part of Eaton Corporation of Cleveland.

Help More Information:
Robert Friedel, Paul Israel, and Bernard S. Finn. Edison Electric Light Bulb. New Brunswick, N.J.: Rutgers University Press, 1987. Out of print.

Sunday, January 15, 2012

Electrical Fuses

Fuses perform the same function as a breaker, except when a fuse blows, it has to be replaced.
There are cartridge fuses and screw-in fuses. Cartridges look kind of like a shotgun shell. They mount in a little rack that pulls in and out of a bracket Screw-in fuses screw in and out like light bulbs. Some have a glass window on top and metal threads on bottom.  A fuse blows; its internal metal strip breaks and the window may get discolored. Be sure to replace a fuse with the exact same amperage-rated fuse. Fifteen and 20 amp fuses are the most common size ratings. Some fuses have a smaller screw base and are called "non-tamper able, type-S" fuses. The threads vary in size so they can't be accidentally replaced by another type. When you install a fuse, screw it in snug, then give an extra 1/4-turn to make a solid connection. Other fuses are rated as "slow-blow" or "time delay." They take a little longer to blow and are made to withstand short, extra surges of power -- like a motor starting. When buying replacements, be sure to get the right fuse types. It's also a good idea to get a couple extra fuses of each type to keep on hand when working on circuits.
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Saturday, January 14, 2012

Circuit Breakers

All newer homes, and many older ones that have been re-wired, will have circuit breakers. Each breaker controls the power to a group of lights, outlets and appliances.
If it hasn't been done already, you should label each breaker so you know just what it controls.
Circuit breakers protect the wiring and fixtures by turning off the power. If a fixture shorts out, or if a circuit gets overloaded, the breaker will "trip."
That cuts power to the circuit and protect the wires and fixtures from damage. The most common reason for a breaker to trip is too many appliances and lights on one circuit.
A tripped breaker usually looks like it's between the ON and OFF positions. To reset a breaker, turn it OFF and then ON again. If a service panel doesn't have breakers, it probably has fuses.


 
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Electrical work’s Using Testers

If working with electricity scares you, a voltage/neon-light tester can help change that. It's an inexpensive, but invaluable tool for determining if a circuit is "live" or "dead."It's basically just a small neon light bulb attached to two wires. When the contacts on the wires are touched to a live circuit, the light goes on. And when there's no juice coming to the circuit, the light stays off .But it's important to get into a good habit of always testing switches, outlets and wires before your hand actually touches them. You can test an outlet without taking off the cover plate, but also check its screw terminals. For that and for switches, you'll have to take off the cover plate .To make sure the power is off before you work on an outlet, test between the screws on each side, and between the screw on the shorter slot side and the green ground screw. No light means the "juice" is off .To check for proper grounding, test between the shorter slot (hot) and the round hole (ground). If the tester lights up, there's probably proper grounding. It should also light when you test between the shorter slot and the cover plate screw .To check that the power is off to a switch, check between both terminals on the switch and then between the copper ground lead and each terminal .For bare wires, hold one tester lead on the bare ground wire (or box if it's grounded) and the other test lead on the hot, then neutral wire. Also check between the two leads. If the light stays off, the circuit is off. Plug-in circuit testers that fit right into outlets can tell you a lot. On our tester, two amber lights mean everything's OK. Other combinations of lights indicate different potential problems with a circuit -- like an improper ground. They're handy for checking and diagnosing connections when you're installing several new cable runs and circuits.      

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Electrical System Basics

Electricity is supplied by a local utility to a house through three underground or overhead wires (two "hot" leads and one neutral lead) that enter the house through a conduit and a meter .Those wires connect to their respective buss bars inside the service panel -- usually two hot, one neutral, and one ground buss .Circuit breakers slide/snap onto the hot buss bars. They act as safeguards against short circuits and overloads by "tripping" off. A breaker also functions as a switch; turning the circuit on and off as desired .Breakers also connect to outgoing "hot" wires. The hot wires deliver power to a device (like a light) and normally have black insulation. Cable with two hot leads also have a red hot lead .Once the electricity has done it's work, it goes back to complete the circuit on the "neutral" wire, which is most often white. Electricity needs this completed circuit to work properly -- a way OUT through the hot wire, and a way BACK through the neutral wire .In addition to the neutral, the green (or bare copper) ground wire offers current another path back should an electrical short or overload happen .From the service panel, the ground has two safe paths to divert electricity: connected to a long metal rod buried outside the house and/or the house's water pipes .All the wires, called cable, are often housed by a flexible plastic sheathing. It's nonmetallic-sheathed (NM) cable, but is often mistakenly called "Romex" which is a brand name made by General Cable Corporation. Cable is also identified by gauge (thickness) and the number of leads it has. For example, NM 14-2G means that the cable is nonmetallic, 14 gauge, has two leads (1 neutral, 1 hot), and a ground wire.

Electrical work’s Safety Steps

Before you do any electrical work on a circuit, make sure the power is off. Turn off the breaker (or pull/unscrew the correct fuse) to the circuit you'll be working on .Post a sign on the service panel so nobody tries to restore power while you're working on the circuits. Double-check the circuit with a circuit tester before you touch it to make sure the correct breaker has been tripped .Labeling or drawing a Before unhooking wires will take any guesswork out of how to reconnect them. Wear shoes with non-conductive soles, use tools with rubber grips and don't stand in water to avoid a potentially dangerous shock.Finally, never push yourself to finish a wiring job. That's when mistakes happen. If you run into a difficult stretch of work, take a break and think about what needs to be done. If you're still not sure, don't take chances -- contact a professional. 

ELECTRICAL WORKS WARNING

DOING WORK WITHOUT A REQUIRED PERMIT IS NOT ONLY ILLEGAL, BUT MAY ALSO INVALIDATE YOUR HOMEOWNER'S  INSURANCE.                                                                                                      When you're doing a remodeling job, wiring may be old and outdated. If you're tearing out walls enough to expose wiring, it should be brought up to code. Obviously, that involves more work and money for materials like cable, boxes, switches, staples, but you'll feel much better having newer, safer cable in the house.                                                               

                                                                                                                                                                                                                       

ELECTRICAL WORK

 
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Getting Started

                             Electrical systems can seem like a confusing mess of connections, cables, and boxes hidden inside the walls. But with a little common sense and a few precautions, yourself can handle most projects. Electrical work can be intimidating because it can be dangerous, and some accidents can cause serious injury. If you're not confident in your ability to do electrical work, continue to learn more about it or consider hiring someone to do the work. Your project may require a building permit an inspections. It's your responsibility to get the proper permit and schedule inspection times.

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