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Sunday, May 19, 2013

Classification of Fire


Dear Readers,

Fires are classified into 5 groups:
CLASS A: Class A fires involve common combustibles such as wood, paper, cloth, rubber, trash and plastics.
 
CLASS B: Class B fires involve flammable liquids' gases, solvents, oil, gasoline, paint, lacquers, tars and other synthetic or oil-based products.
 
CLASS C: Class C fires involve energized electrical equipment, such as wiring, controls, motors, data processing panels or appliances.
 
CLASS D: Class D fires involve combustible metals such as magnesium and sodium.

CLASS K: Class K fires involve combustible cooking media such as oils and grease commonly found in commercial kitchens.
 
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Wednesday, May 1, 2013

Standard Wire Gauge (SWG)

Dear Readers,
 
Wish You a Happy May Day-2013
 
This article let us discuss about Gauge systems. This systems are used to represent the thickness of the wire or diameter of the wire. In Great Britain wire gage has been legalized. This is called the Standard Wire Gage (S.W.G.), formerly called Imperial Wire Gage.
 
 Other main systems for measuring gauge are American Wire Gauge (AWG), Standard Wire Gauge (SWG) and Birmingham Wire Gauge (BWG). However AWG and SWG are widely used throughout the world. In general ferrous metals are using Standard Wire Gauge (SWG) and Non-ferrous metals (meaning those that do not contain iron) are using the American Wire Gauge (AWG).
 
Wire diameter is a premier factor in determining the wire. Different numbering systems are used, depending on the type of metal. Inch and millimetre dimensions are used for Standard Wire Gauge (SWG). No. 7/0 is the largest size (0.50 inch or 12.7 mm) in diameter, and No. 50 is the smallest( 0.001 inch or about 25 µm) in diameter. Overall as the gauge number decreases, the thickness of the wire increases. Wire gauge can refer to both electrical and mechanical.
 
The Dimension details are below
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