When was armored cable invented? Armored Cable, or BX, first appeared in the 1903 NEC, but didn’t start becoming popular until around 1930, and is still a popular wiring method today. AC cable is described in Art. 320 of the NEC. The armor of AC cable systems is tested for grounding and can provide a suitable equipment grounding path.
When was Armoured cable first used? BX wiring (also known as armored cable) is the 2nd generation of wiring used in homes. It first appeared in the 1903 National Electrical Code (NEC) book. It became popular in the 1920s, and it was the main wiring type by 1932.
When was metal clad cable invented? Armored cable was first listed with Underwriters Laboratories Inc. in 1899 for the Sprague Electric Co. of New York. It was originally called “Greenfield Flexible Steel-Armored Conductors,” after one of its inventors, Harry Greenfield.
When did NM cable come out? Nonmetallic-sheathed cable, or NM for short, was first Listed and described in the NEC in 1926, but it was invented a few years earlier by Rome Wire Company in 1922 in Rome, NY, and marketed under the trade name “Romex®.” Romex® is now a registered trademark of Southwire Company of Carrollton, GA.
When was armored cable invented? – Related Questions
Who invented the cantilever bridge?
The first cantilever bridge was built in 1867 by Heinrich Gerber. He created two bridges: one over the Regnitz river in Bamberg, and the Main Bridge over the Main river in Haßfurt. Because Gerber invented it, the cantilever bridge was also known as the Gerber Beam.
Why math is invented?
The only reason mathematics is admirably suited describing the physical world is that we invented it to do just that. … If the universe disappeared, there would be no mathematics in the same way that there would be no football, tennis, chess or any other set of rules with relational structures that we contrived.
What did lisa gelobter invented?
Lisa has worked on several pioneering Internet technologies and created products that have been used by billions of people including: Shockwave, Hulu, and the ascent of online video. Most recently, she worked at the White House, serving as the Chief Digital Service Officer for the Department of Education.
What year was the enigma machine invented?
Similar machines were first made in the early 20th century, and the first ‘Enigma’ was invented by German engineer Arthur Scherbius in 1918, who sought to sell it for commercial, rather than military, purposes.
How were steam engines invented?
In 1698 Thomas Savery patented a pump with hand-operated valves to raise water from mines by suction produced by condensing steam. In about 1712 another Englishman, Thomas Newcomen, developed a more efficient steam engine with a piston separating the condensing steam from the water.
What year was the pellet gun invented?
The gun was developed in 1768 or 1769 by the Tyrolean watchmaker, mechanic and gunsmith Bartholomäus Girandoni (1744–1799) and is sometimes referred to as the Girandoni air rifle or Girandoni air gun in literature (the name is also spelled “Girandony,” “Giradoni” or “Girardoni”.)
How was factoring invented?
Factorization was first considered by ancient Greek mathematicians in the case of integers. They proved the fundamental theorem of arithmetic, which asserts that every positive integer may be factored into a product of prime numbers, which cannot be further factored into integers greater than 1.
When did down jackets get invented?
In 1936, Eddie Bauer invented a quilted jacket insulated by goose down after contracting hypothermia on a winter fishing trip in Washington, setting the template for technicalwear. Two years later, the couturier Charles James designed an evening jacket that resembled a cropped quilt.
Who invented the world wide web internet?
Tim Berners-Lee, a British scientist, invented the World Wide Web (WWW) in 1989, while working at CERN.
What was nobel’s most famous invention?
Alfred Nobel is best known for his invention of dynamite and an explosive device called a blasting cap, which inaugurated the modern use of high explosives. He also founded the Nobel Prizes.
Why was bgp invented?
BGP is still a path vector protocol like its predecessor EGP, but it was conceived foreseeing a peer-to-peer environment where AS’s could exchange routing information without relying either on a priori topology knowledge or on a core AS.
Who invented whatsapp application?
Our Team. WhatsApp was founded by Jan Koum and Brian Acton who had previously spent 20 years combined at Yahoo. WhatsApp joined Facebook in 2014, but continues to operate as a separate app with a laser focus on building a messaging service that works fast and reliably anywhere in the world.
When was the paddle wheel invented?
As invented in 1685 by French physicist Denis Papin, the paddle wheel (driven by compressed steam from wood- or coal-fired boilers) was affixed to the boat hull either laterally (side-wheeler) or at the rear of the boat (sternwheeler) and provided forward and reverse propulsion.
Where are most inventions coming from?
Once again, Switzerland remains the global leader in innovation, followed by the United Kingdom, Sweden, the Netherlands and the United States.
When was crochet invented?
A great many sources state that crochet has been known as far back as the 1500s in Italy under the name of ‘nun’s work’ or ‘nun’s lace,’ where it was worked by nuns for church textiles,” she says.
Who invented the kids meal?
In 1967, Burger Chef was purchased by General Foods for $16 million. By 1969, it had 1,000 restaurants. While Burger Chef was at its peak, it introduced a concept most people associate with McDonald’s: the kids’ meal. In 1973, the “Fun Meal” was the first fast-food meal to bundle burgers with a dessert and a toy.
When was the chinese compass invented?
Appearing in China around the 4th century BC, primitive compasses showed people the way not literally, but figuratively, helping them order and harmonize their environments and lives. served as designators of direction that the Chinese primarily used to order and harmonize their environments and lives.
How did willem einthoven invent the electrocardiogram?
In 1903 he devised the first string galvanometer, known as the Einthoven galvanometer; with this instrument he was able to measure the changes of electrical potential caused by contractions of the heart muscle and to record them graphically. … He coined the term electrocardiogram for this process.
What day was the first typewriter invented?
The first machine known as the typewriter was patented on 23rd June 1868, by printer and journalist Christopher Latham Sholes of Wisconsin.
How did thomas jefferson invented macaroni and cheese?
Jefferson was not the first to introduce macaroni (with or without cheese) to America, nor did he invent the recipe as some have claimed. It is possible that he helped to popularize it by serving it to dinner guests during his presidency. A recipe for macaroni in Jefferson’s own hand survives: … dress them as maccaroni.
When were inhalers for asthma invented?
English physician and astronomer John Mudge created the first inhaler in 1778. Based on a pewter tankard, the inhaler allowed people to breathe in an opium vapor to treat what was called a “catarrhous cough,” a cough with a lot of mucus.