2. Electrical Safety

2013 alexander ganago page 18 of 28 last printed 2013

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Unformatted text preview: ། Know how to turn off the voltage that powers household appliances and equipment at work: learn where the circuit breakers are and how to operate them Ø། Always to turn off the voltage before trying to repair appliances or replace their parts Ø། Never touch a bare wire which can be under voltage, especially, with your palm; if absolutely necessary, touch it with the outer side of your hand Ø། Never try to plug a bare wire into a power outlet Ø། Do not replace a light bulb until you make sure the socket is not powered Ø། Do not attempt to repair an appliance, which can be under voltage Ø། Do not open covers of any electronic equipment: it may contain charged capacitors at high voltage, even if the unit had been disconnected from the power grid Ø། Before working with electricity, make sure that your hands are clean and dry; ensure good insulation of your feet from the ground, and be alert to any possible danger Ø། Be especially careful with appliances that can get wet – in the kitchen, bathroom, etc. Ø། Never use a hair dryer in the bathtub Ø། Be especially careful when your hands can get wet or moist – and you have to work with electricity Ø། Do not operate power tools such as electric drills when you stand on a wet floor in wet footwear. Ø། Do not attempt to plug a 3- prong power cable to a receptacle or extension cord that connects only 2 wires. Ø། Ensure that every power receptacle located where electricity is near water is equipped with GFCI. <Sidebar> The rules of electrical safety are based on the scientific data and common sense; as many other safety rules, they are written with somebody’s blood. Follow them at workplace and at home: remember the hazards of electricity and avoid the danger. © 2013 Alexander Ganago Page 21 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 Example: Electric shock from a power tool Consider a worker who operates an electric drill, which is plugged into a 120- V power outlet and has faulty insulation (Figure 2- 5) so that the hot wire touches the inside of the aluminum handle. 1. Determine the path of current through the worker’s body. 2. Assume that the worker’s hands and feet are dry, and the electric resistance of dry shoes is 100 kΩ. Use the data in Figures 2- 1 and 2- 3: determine the current through the worker’s body and its harmful effects on the human body. Predict what happens as a result of electric shock. 3. Compare your...
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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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