Basic Electrical Safety

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Basic Electrical Safety

  1. 1. F u l l Electrical C i r Safety Safety c l Basic Electrical Safety e Basic Electrical Safety H o m e √ Course not designed to teach you I n to work on electrical equipment. s p e c √ t You will not be qualified to work on i o n electrical equipment. s √ If you spot problems with electrical equipment you should report it to your supervisor. Basic Electrical Safety
  2. 2. F u l l Electrical C i r Safety Safety c Objectives l Objectives e H o m • Be familiar with the fundamental e I n concepts of electricity. s p e c t • Be familiar with the effects of electricity i o n s on the human body. • Be able to recognize common electrical hazards. Basic Electrical Safety
  3. 3. F u l l Electrical C i r Safety Safety c Objectives Objectives l e H o m e I • Be familiar with electrical protective n s p devices. e c t i o n s Basic Electrical Safety
  4. 4. F u l l Electrical C i r Safety Safety c Fundamentals of Electrical l e H Hazards o m e • I To flow electricity must have a n s p complete path. e c t • i Electricity flows through conductors o n s – water, metal, the human body • Insulators are non-conductors • The human body is a conductor. Basic Electrical Safety
  5. 5. F u l l Electrical C i r Safety Safety c Fundamentals of Electrical l e H Hazards o m e I n s p Have You Ever Been Shocked? e c t i o n s THE BASICS Basic Electrical Safety
  6. 6. F u l l Electrical C i r Safety Safety c Fundamentals of Electrical Hazards l e H o √ More than 3 ma m e painful shock I n √ More than 10 ma s p muscle contraction “no-let-go” danger e c √ More than 30 ma t i o n lung paralysis- usually temporary s √ More than 50 ma possible ventricular fib. (heart dysfunction, usually fatal) √ 100 ma to 4 amps certain ventricular fibrillation, fatal √ Over 4 amps heart paralysis; severe burns. Usually caused by >600 volts Basic Electrical Safety
  7. 7. F u l l Electrical C i r Safety Safety c Fundamentals of Electrical Hazards l e H o • Hazards of Electricity m e – Electrocution/Shock/Burns/Death I n s p • Minimum distance from overhead lines 10 e c ft. t i o n • Inspect all electrical tools and equipment s Frayed, cut, broken wires grounding prong missing Improper use of cube taps improperly applied or missing strain relief Basic Electrical Safety
  8. 8. F u l l Electrical C i r Safety Safety c Electrical Protection Electrical Protection l e H o • m Circuit Breakers e – Provided to protect EQUIPMENT not people I n – Do not reset breakers with a line voltage higher than 120V s p and only reset if you know why it tripped e c t i o n • GFCI’s s - Provided to protect people - Trip range 4-6ma - Monthly test Basic Electrical Safety
  9. 9. F u l l Electrical C i r Safety Safety c Electrical Protection Electrical Protection l e H o m • Distance e I n – If you sense the presence of an s p e electrical hazard or exposed conductors c t i o that may be energized, keep your n s distance and STAY AWAY Basic Electrical Safety
  10. 10. F u l l Electrical C i r Safety Safety c l Terminology e H o m e I n s p e c t i o n s Basic Electrical Safety
  11. 11. F u l l Electrical C i r Safety Safety c l e Electrical Grounding H o m e I n s p e c t i o n s Basic Electrical Safety
  12. 12. F u l l Electrical C i r Safety Safety c l e H o m e I n s p e c t i o n s Basic Electrical Safety
  13. 13. F u l l Electrical C i r Safety Safety c l e H o m e I n s p e c t i o n s Basic Electrical Safety
  14. 14. F u l l Electrical C i r Safety Safety c l e H o m e I n s p e c t i o n s Basic Electrical Safety
  15. 15. F u l l Electrical C i r Safety Safety c l e H o m e I n s p e c t i o n s Basic Electrical Safety
  16. 16. F u l l Electrical C i r Safety Safety c Fundamentals of Electrical l e H Hazards o m e • I Voltage n s p – electrical pressure (water pressure) e c t • i Amperage o n s – electrical flow rate (gallons/min) • Impedance – restriction to electrical flow (pipe friction) Basic Electrical Safety
  17. 17. F u l l Electrical C i r Safety Safety c Fundamentals of l e H Electrical Hazards o m e • Circuit I n s p – path of flow of electricity e c t • Circuit Element i o n s – objects which are part of a circuit and through which current flows. • Fault – current flow through an unintended path. Basic Electrical Safety
  18. 18. F u l l Electrical C i r Safety Safety c Fundamentals of Electrical l e H Hazards o m e • What is Grounding? I n s – Protection from electric shock p e c t • normally a secondary protection measure i o n • A ground is a conductive connection s – between electrical circuit or equipment and earth or ground plane – creates a low resistance to the earth. Basic Electrical Safety
  19. 19. F u l l Electrical C i r Safety Safety c l Basic Rules of Electrical Action e Basic Rules of Electrical Action H o m e I n • Electricity isn’t live until current flows s p e c t i o n • Electrical current won’t flow until there is s a complete loop, out from and back to the power source. Basic Electrical Safety
  20. 20. F u l l Electrical C i r Safety Safety c l e Preventing Accidental Electrical Contact Preventing Accidental Electrical Contact H o m e Electrocution Prevention I n s p e c y t ay icit i o Pa Gr n Aw ctr s th ou Ele ep nd Ke Time GFCI Basic Electrical Safety
  21. 21. F u l l Electrical C i r Safety Safety c l e Do’s and Don'ts Do’s and Don'ts H o m e • Do plug power equipment into wall I n receptacles with power switches in the Off s p e position. c t i • o Do unplug electrical equipment by grasping n s the plug and pulling. Do not pull or jerk the cord to unplug the equipment. • Do not drape power cords over hot pipes, radiators or sharp objects. Basic Electrical Safety
  22. 22. F u l l Electrical C i r Safety Safety c l Do’s and Don'ts e Do’s and Don'ts H o m e I • n Do check the receptacle for missing or s p e damaged parts. c t i o • Do not plug equipment into defective n s receptacles. • Do check for frayed, cracked, or exposed wiring on equipment cords. Basic Electrical Safety
  23. 23. F u l l Electrical C i r Safety Safety c l e Do’s and Don'ts Do’s and Don'ts H o m • Do check for defective cords clamps at e I n locations where the power cord enters s p e the equipment or the attachment plug. c t i o n s • Extension cords should not be used in office areas. Generally, extension cords should be limited to use by maintenance personnel Basic Electrical Safety
  24. 24. F u l l Electrical C i r Safety Safety c l e Do’s and Don'ts Do’s and Don'ts H o m e I n • “Cheater plugs”, extension cords with s p e junction box receptacle ends or other c t i o jury-rigged equipment should not be n s used. Basic Electrical Safety
  25. 25. F u l l Electrical C i r Safety Safety c l e Do’s and Don'ts Do’s and Don'ts H o m e I n • s Consumer electrical equipment or p e c appliances should not be used if not t i o n properly grounded. (Look for the UL s Label) Basic Electrical Safety
  26. 26. F u l l Electrical C i r Safety Safety c l e Do’s and Don'ts Do’s and Don'ts H o m e I n • s Employees should know the location of p e c electrical circuit breaker panels that t i o n control equipment and lighting in their s respective areas. Circuits and equipment disconnects must be identified Basic Electrical Safety
  27. 27. F u l l Electrical C i r Safety Safety c Do’s and Don'ts l Do’s and Don'ts e H o m • Temporary or permanent storage of any e I n materials must not be allowed within 3 s p e feet of any electrical panel or electrical c t i o equipment. n s • Any electrical equipment causing shocks or with high leakage potential must be tagged with a Danger tag or equivalent. Basic Electrical Safety
  28. 28. F u l l Electrical C i r Safety Safety c Myths and Misconceptions l Myths and Misconceptions e H o m e • Electricity takes the path of least I n s resistance. p e c t i o n • s Electricity wants to go to ground. • If an electric tools falls into a sink or tub of water, the item will short out. Basic Electrical Safety
  29. 29. F u l l Electrical C i r Safety Safety c l Myths and Misconceptions e Myths and Misconceptions H o m e I • AC reverse polarity is not hazardous. n s p • e It takes high voltage to kill; 120 volts is c t i o not dangerous. n s • Double insulated power tools are doubly safe and can be used in wet and damp locations. Basic Electrical Safety
  30. 30. F u l l Electrical C i r Safety Safety c l e H o m e I n s p e c t i o n s Basic Electrical Safety

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