2. Electrical Safety

Working with electricity make sure that your hands

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Unformatted text preview: result with the scenario described above (in the text accompanying Figure 2- 5). Explain which component of the total electric resistance made the greatest difference between the two scenarios. Reasoning: 1. The current enters the worker’s body through the palm of the hand electricity! v༇ Never keep working with a tool that has given you a shock! v༇ 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. v༇ High voltages eliminate the main protection of the human body against electric shock because they may puncture the skin. v༇ An electric circuit is an interconnection of electrical elements linked together in a closed path to ensure that electric current can flow continuously. v༇ A shock circuit involves the human body and may cause an electric shock. v༇ When working on a circuit that can be connected to a source of voltage or current, use only one hand and keep the other hand in a pocket or behind your back. © 2013 Alexander Ganago Page 24 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 v༇ 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. v༇ The electric potentials created on the surface of the ground by a thunderbolt or a fallen high- voltage wire may cause a lethal electric shock due to the foot- to- foot connection. The best survival strategy is to minimize the potential difference between the feet. v༇ An electric appliance with faulty insulation may deliver a deadly shock to the user. v༇ Polarized plugs, which have the two blades of different widths and can be plugged into the receptacle only one way, provide an additional protection against electric shock. v༇ The third wire, which connects the metal case of an electric appliance to the ground, protects the user from electric shock. v༇ Ground Fault Circuit Interrupter (GFCI) measures the difference between the input and output currents to/from the appliance; it automatically and promptly opens the circuit if...
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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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