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Electrical Safety

Learn about factors involved in electrical shock, including current levels, voltage, body resistance, and safe working habits. Discover the dangers of DC vs. AC, typical electrostatic shocks, and how to protect equipment. Explore real-life scenarios, safe practices, and the phases of electrical safety. Stay informed to prevent accidents and ensure safety in commercial, industrial, medical, and military settings.

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Electrical Safety

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  1. Electrical Safety Understanding and Protecting Yourself from Electrical Shock Humbly Presented By Prof. Bitar

  2. Factors Involved in Electrical Shock • The Amount of Current (amps) • The Current Path • The Duration Q. So what about the Voltage?

  3. What Does the Amount of Current Depend On? • The amount of current that flows depends on the voltage applied as well as the body resistance. (ie. Ohm’s Law: I = V / R )

  4. Dangerous Current Levels( Based on a Body Weight of 150 Lbs. ) Source: Environment, Safety, and Health Manual, Volume II, Part 16.1, U.S. Dept. of Energy at University of California Lawrence Livermore National Laboratory, Contract W-7405-ENG-48, Feb 1996.

  5. Body Resistance (Ohms) Source: Environment, Safety, and Health Manual, Volume II, Part 16.1, U.S. Dept. of Energy at University of California Lawrence Livermore National Laboratory, Contract W-7405-ENG-48, Feb 1996.

  6. Scenario #1 • An electrician with sweaty hands picks up a live 120VAC 60Hz circuit (finger-thumb grasp)… Q1: How much current will flow? Q2: Is this amount of current fatal?

  7. Scenario #2 • A lab power supply is set to +/- 30V DC with wires all over the bench. A coke is accidentally spilled, and a student wipes up the mess with paper towels… Q1: How much current will flow? Q2: Is this amount of current fatal?

  8. Where is the Danger? • How many volts are involved in a typical electrostatic shock? Isn’t this dangerous? • If I grab the terminals of a 12V car battery, will I be electrocuted? What is the danger? • Which is more dangerous, DC or AC?

  9. Safe Working Habits • One Hand... • Never Alone… • Safety Glasses… • Shut Power Off… • Unplug Equipment… • Remove Obstacles… • Be Neat… • Discharge Capacitors…

  10. Four Phases of Electrical SafetyBased on Electrical Safety Training at Massachusetts Electric Co. • Unconsciously Unsafe • Consciously Unsafe • Consciously Safe • Unconsciously Safe

  11. What About Protecting Components and Equipment? • Do Not Exceed… • Voltage Ratings (Volts) • Current Ratings (Amps) • Power Ratings (Watts) • Use a Reasonable Safety Margin • Commercial • Industrial • Medical • Military / Aerospace

  12. A Remarkable Story… • 20,000 Volts 60Hz AC • Estimated Current (50-100mA) • Grabbing with Both Hands • A Critical Path • Longer than 3 Seconds “It is good to learn from one’s mistakes… but it is better to learn from the mistakes of others.” “There, but for the grace of God go I !” George Whitefield (1714-1770)

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