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Technician License Course

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  1. Technician License Course

  2. Technician License Course Chapter 9 Lesson Plan Module – 18 Safety & Amateur Radio

  3. Electrical Injuries

  4. Electrical Injuries • Shocks and burns.

  5. Electrical Injuries • Shocks and burns. • Low voltages can cause enough current to create problems.

  6. Electrical Injuries • Shocks and burns. • Low voltages can cause enough current to create problems. • Equipment today uses lower voltage than tube equipment but it can still cause burns.

  7. Electrical Safety

  8. Electrical Safety • Avoiding contact is the most effective way of practicing electrical safety

  9. Electrical Safety • Avoiding contact is the most effective way of practicing electrical safety • Unplug equipment before working on it

  10. Electrical Safety • Avoiding contact is the most effective way of practicing electrical safety • Unplug equipment before working on it • Keep one hand in your pocket

  11. Electrical Safety • Avoiding contact is the most effective way of practicing electrical safety • Unplug equipment before working on it • Keep one hand in your pocket • Make sure equipment is grounded

  12. Electrical Safety • Avoiding contact is the most effective way of practicing electrical safety • Unplug equipment before working on it • Keep one hand in your pocket • Make sure equipment is grounded • Use power from GFCI-protected circuits

  13. Mitigating Electrical Hazards

  14. Mitigating Electrical Hazards • If working on live equipment is required:

  15. Mitigating Electrical Hazards • If working on live equipment is required: • Remove jewelry

  16. Mitigating Electrical Hazards • If working on live equipment is required: • Remove jewelry • Avoid unintentional touching of circuitry

  17. Mitigating Electrical Hazards • If working on live equipment is required: • Remove jewelry • Avoid unintentional touching of circuitry • Never bypass safety interlocks

  18. Mitigating Electrical Hazards • If working on live equipment is required: • Remove jewelry • Avoid unintentional touching of circuitry • Never bypass safety interlocks • Discharge high-voltage points and components to ground

  19. Mitigating Electrical Hazards • If working on live equipment is required: • Remove jewelry • Avoid unintentional touching of circuitry • Never bypass safety interlocks • Discharge high-voltage points and components to ground • Capacitors can store charge after power is off

  20. Mitigating Electrical Hazards • If working on live equipment is required: • Remove jewelry • Avoid unintentional touching of circuitry • Never bypass safety interlocks • Discharge high-voltage points and components to ground • Capacitors can store charge after power is off • Storage batteries are dangerous when shorted

  21. Responding to Electrical Injury

  22. Responding to Electrical Injury • REMOVE POWER!

  23. Responding to Electrical Injury • REMOVE POWER! • Have ON/OFF switches and circuit breakers clearly marked.

  24. Responding to Electrical Injury • REMOVE POWER! • Have ON/OFF switches and circuit breakers clearly marked. • Install an emergency master power switch and make sure your family knows how to use it.

  25. Responding to Electrical Injury • REMOVE POWER! • Have ON/OFF switches and circuit breakers clearly marked. • Install an emergency master power switch and make sure your family knows how to use it. • Call for help.

  26. Responding to Electrical Injury • REMOVE POWER! • Have ON/OFF switches and circuit breakers clearly marked. • Install an emergency master power switch and make sure your family knows how to use it. • Call for help. • Learn CPR and first aid.

  27. Electrical Grounding and Circuit Protection

  28. Electrical Grounding and Circuit Protection • Make sure your station wiring meets code

  29. Electrical Grounding and Circuit Protection • Make sure your station wiring meets code • Most ham equipment does not require special wiring or circuits

  30. Electrical Grounding and Circuit Protection • Make sure your station wiring meets code • Most ham equipment does not require special wiring or circuits • Use 3-wire power cords

  31. Electrical Grounding and Circuit Protection • Make sure your station wiring meets code • Most ham equipment does not require special wiring or circuits • Use 3-wire power cords • Use circuit breakers, circuit breaker outlets, or Ground Fault Circuit Interrupter (GFCI) circuit breakers or outlets

  32. Electrical Grounding and Circuit Protection • Make sure your station wiring meets code • Most ham equipment does not require special wiring or circuits • Use 3-wire power cords • Use circuit breakers, circuit breaker outlets, or Ground Fault Circuit Interrupter (GFCI) circuit breakers or outlets • Use proper fuse or circuit breaker size

  33. Electrical Grounding and Circuit Protection • Make sure your station wiring meets code • Most ham equipment does not require special wiring or circuits • Use 3-wire power cords • Use circuit breakers, circuit breaker outlets, or Ground Fault Circuit Interrupter (GFCI) circuit breakers or outlets • Use proper fuse or circuit breaker size • Don’t overload single outlets or circuits

  34. Grounding & Bonding at RF

  35. Grounding & Bonding at RF • RF burns from “hot spots” at high RF voltage

  36. Grounding & Bonding at RF • RF burns from “hot spots” at high RF voltage • Do not cause serious injury at ham power level

  37. Grounding & Bonding at RF • RF burns from “hot spots” at high RF voltage • Do not cause serious injury at ham power level • Prevent by bonding (connecting) equipment together with heavy wire or strap – braided strap not recommended at RF

  38. Grounding & Bonding at RF • RF burns from “hot spots” at high RF voltage • Do not cause serious injury at ham power level • Prevent by bonding (connecting) equipment together with heavy wire or strap – braided strap not recommended at RF • Prevent by keeping people away from antennas and radial or counterpoise wires

  39. Grounding & Bonding at RF • RF burns from “hot spots” at high RF voltage • Do not cause serious injury at ham power level • Prevent by bonding (connecting) equipment together with heavy wire or strap – braided strap not recommended at RF • Prevent by keeping people away from antennas and radial or counterpoise wires • Ground equipment for AC safety

  40. Lightning Protection

  41. Lightning Protection • Ground antennas and towers to local code

  42. Lightning Protection • Ground antennas and towers to local code • Use 8-ft ground rod for each tower leg

  43. Lightning Protection • Ground antennas and towers to local code • Use 8-ft ground rod for each tower leg • Bond rods to tower leg and the other rods

  44. Lightning Protection • Ground antennas and towers to local code • Use 8-ft ground rod for each tower leg • Bond rods to tower leg and the other rods • Ground connections should be as short as possible

  45. Lightning Protection • Ground antennas and towers to local code • Use 8-ft ground rod for each tower leg • Bond rods to tower leg and the other rods • Ground connections should be as short as possible • Use lightning arrestors on a single ground plate where cables enter the house

  46. Lightning Protection • Ground antennas and towers to local code • Use 8-ft ground rod for each tower leg • Bond rods to tower leg and the other rods • Ground connections should be as short as possible • Use lightning arrestors on a single ground plate where cables enter the house • Unplug and disconnect equipment (including telephones and computers) and feed lines if lightning is expected

  47. RF Exposure

  48. RF Exposure • Electromagnetic radiation (EMR) is not the same as radioactivity – much lower energy

  49. RF Exposure • Electromagnetic radiation (EMR) is not the same as radioactivity – much lower energy • RF energy heats body tissues

  50. RF Exposure • Electromagnetic radiation (EMR) is not the same as radioactivity – much lower energy • RF energy heats body tissues • Heating depends on the RF intensity and frequency.