2. Electrical Safety

In industry any voltage above 30 v is considered as

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Unformatted text preview: n of electrical elements linked together in a closed path to ensure that electric current can flow continuously. <Sidebar> An electric circuit is an interconnection of electrical elements linked together in a closed path to ensure that electric current can flow continuously. Usually, a circuit includes one or more sources of voltage/current, conducting wires, and various loads – lamps, motors, etc. By touching such a circuit so that a part of the current flows through your body, you change the original circuit and create a shock circuit, which, as the name suggests, may cause an electric shock. <Sidebar> A shock circuit involves the human body and may cause an electric shock. Depending on the circumstances, the shock circuit may include connections: Ø། From finger to thumb Ø། From hand to hand Ø། From hand to foot Ø། From foot to foot, etc. Some connections are more dangerous than the others, because they allow electric currents to flow through the vital organs – heart, lungs, etc. Evidently, the hand- to- hand and hand- to- foot connections belong to the most dangerous. By comparison, the finger- to- thumb connection limits the path of currents to one hand and protects the rest of the body: see Figure 2- 4. To ensure the safe connection, use only one hand when working on a live circuit (which is or may be connected same scenario” [1]. <Sidebar> Hand- to- foot electric shock may take place due to operating power tools with faulty insulation. If the current exceeds the Let- Go threshold, the danger is mortal. The shock circuit due to foot- to- foot connection, which is also dangerous because the current flows through the vital organs, may take place during a thunderstorm © 2013 Alexander Ganago Page 14 of 28 Last printed 2013- 07- 07 12:28 AM File: 2013 EEW 1- 02 Electrical safety.docx Engineering in the Electrical World (EEW) Part 1 Unit 2: Electrical safety when lightning strikes in the ground near you, as sketched in Figure 2- 6. At the site of the thunderbolt strike, the electric potential may reach megavolts; the farther from this site, the lower the potential becomes. Figure 2- 6. At the site where the lightning bolt strikes, the electric potential is extremely high; the farther from the site, the lower it becomes....
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This note was uploaded on 12/06/2013 for the course EECS 314 taught by Professor Ganago during the Fall '07 term at University of Michigan.

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