Electric Blasting

Electric Blasting

 

blasting with an electric blasting cap connected in a blasting circuit. Electric blasting was proposed in Russia in 1812 by P. L. Shilling as a means for exploding powder charges with the aid of carbon fuzes developed by Shilling. In 1839 the carbon fuzes were replaced by electric fuzes equipped with a bridge wire. Primary batteries for electric blasting were developed in 1840, and the first shot exploder, of magnetoelectric design, was introduced in 1843.

In electric blasting, conductors are used to connect the blasting caps together and to the current source. Series, parallel, and combination connections are used, depending on the blasting conditions.

Electric blasting is widely used in mining, construction, and military engineering work. Modern blasting equipment and instruments ensure the necessary work safety when stray currents or static electricity may be present and when blasting is conducted near high-voltage lines, radio transmitters, or radar equipment. The use of capacitor-discharge shot exploders makes it possible to trigger blasting circuits with as many as 1,500 electric blasting caps.

REFERENCE

Lur’e, A. I. Elektricheskoe vzryvanie zariadov, 2nd ed. Moscow, 1963.
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The responding police force found in the reported area 21 improvised hand grenades, 5 pieces improvised anti-personnel clamor mines, three PVC pipes, 52-meter long electrical wire, 3 kilograms of soluble fertilizer, 200 grams of sulfur, chemical substances, a kilogram of ANFO (ammonium nitrite, fuel oil), 4 pieces dynamite; 60 pieces improvised electric blasting cap; 240 kilograms steel cut fragments (round bars), 370-meter safety fuse, gun powder, steel pipes and other bomb-making materials.
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A brief history of initiating systems development (not exclusively Orica's) Decade Key Developments 1740s Electric Ignition of Gunpowder [*] 1830s Safety Fuse [**] 1860s Fuse Blasting Detonator [**] 1870s Electric Blasting Dynamo [**] 1870s Electric Blasting Machine [*] 1880s Electric Blasting Cap [*] 1900s Lead Sheathed Detonating Cord [*] 1900s Regular Delay Blasting Cap [*] 1930s Textile Sheathed Detonating Cord [***] 1940s Millisecond Delay Blasting Cap [*] 1970s Signal Tube Detonator [***] 970s 1st Generation Electronic Detonator [***] 1980s Indirectly Coupled, Induced Current Detonator [***] 1990s 2nd Generation Electronic Detonator [***] 2000 i-kon Source: (*.
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