2. Electrical Safety

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Unformatted text preview: as well as bracelets and necklaces may short the terminals of a car battery, causing electric arc, which leads to horrible scenarios including burns, etc. (see above). The take- home message is: Remove all jewelry before you start working with electricity! <Sidebar> Remove all jewelry before you start working with electricity! Tools may also become a source of danger: for example, a wrench or screwdriver dropped on the terminals of a car battery may cause electric arc. Hand tools with bad insulation can conduct electric currents to your body. Power tools with poorly insulated cords can directly connect your body to the power grid! Never keep working with a tool that has given you a shock! <Sidebar> Never keep working with a tool that has given you a shock! Mild electric shocks, which do not involve muscle paralysis, present an indirect danger because they may cause the person to jerk, drop a tool, fall from a ladder, etc. For example, working on a car battery, a person may accidentally move an arm into the rotating fan! © 2013 Alexander Ganago Page 10 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 <Sidebar> Mild electric shocks, which do not involve muscle paralysis, present an indirect danger because they may cause the person to jerk, drop a tool, fall from a ladder, etc. The electric resistance of the human skin also depends on the voltage! If the voltage applied to the skin exceeds 240 V, it may puncture the skin, literally burning a hole. Thus high voltages eliminate the main protection of the human body and present a special danger compared to household 120 or 240 V. <Sidebar> High voltages eliminate the main protection of the human body against electric shock because they may puncture the skin. © 2013 Alexander Ganago Page 11 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 The path of electric current through the human body In Unit 1, we discussed grounding as a means for removing static electric charges. Grounding involves only one wire – to the ground. Here we discuss an electric circuit – interconnectio...
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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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