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Recognizing Electrical Risk Factors

Module 2. Recognizing Electrical Risk Factors. Recognize. Evaluate. Control. Module Objectives. Define electrical risk factors. List and describe electrical risk factors that may contribute to workplace injuries.

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Recognizing Electrical Risk Factors

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  1. Module 2 Recognizing Electrical Risk Factors

  2. Recognize Evaluate Control

  3. Module Objectives • Define electrical risk factors. • List and describe electrical risk factors that may contribute to workplace injuries. • List the most important electrical risk factors to look for in your workplace.

  4. Module Objectives • Identify methods for identifying electrical hazards. • Identify causes of arc blast and the risk factors that contribute to it. • Presented with a problem, describe how to determine risk factors, then list the risk factors.

  5. Electrical Risk Factor An existing or potential condition that, by itself or interacting with other variables, could create an electrical incident that could result in injury, death, property damage or other loss Also called electrical hazard

  6. Four Risk Factor Categories Environment Equipment Work Practices Individual

  7. Environmental Risk Factors Electrical risks that are in the work environment

  8. Equipment Risk Factors Electrical risks in the equipment at a worksite

  9. Work Practices Risk Factors Electrical risks caused by work requirements, processes or procedures

  10. Individual Risk Factors Risks that are unique to and caused by the individual

  11. Identifying Electrical Hazards • Tailgate meetings and job briefings • Checklists • Job safety analysis • Safety inspections • OSHA log analysis • Incident investigation logs PROACTIVE REACTIVE

  12. Arc Flash Luminous electrical discharge (bright, electrical sparking) through the air that occurs when high voltages exist across a gap between conductors

  13. Arc Blast An explosive release of molten materials from equipment caused by high-amperage arcs

  14. What Happens in an Arc Blast? • Heat builds to 35,000º F 2. Copper expands by a factor of 67,000 3. Metal melts 4. There is intense light 5. There are pressure and sound waves 6. Shrapnel flies

  15. Arc Blast

  16. Consequences of Arc Blast • Skin burns • Ignition of clothing • Damage of eyesight • Hearing loss/ruptured eardrums • Lung collapse • Concussion/loss of memory

  17. Consequences of Arc Blast—continued • Shrapnel wounds • Physical wounds • Loss of life • Lost work time • Loss or damage of equipment

  18. Did You Know? The electrical hazard responsible for 80% of incidents and fatalities is: • Electrocution for unqualified workers. • Arc flash/blast for qualified workers.

  19. Where Does Arc Blast Occur? • Panel boards • Switchboards • Motors • Transformers • Motor starters • Drive cabinets • Fused disconnects

  20. Causes of Arc Blast • Proximity to a high-amp source with a conductive object • Equipment failure from substandard parts • Improper installation of equipment or outlets • Worn or damaged equipment

  21. Causes of Arc Blast—continued • Broken insulation • A dropped tool that causes a spark • Dust, corrosion or other impurities on the surface of the conductor • Accidental contact (by humans or animals) • Improper work procedures

  22. Accidental Contact—Example Photo courtesy of Schneider Electric

  23. Accidental Contact—A Better View Photo courtesy of Schneider Electric

  24. Hazardous Tasks • Removing or installing circuit breakers or fuses • Working on energized control circuits • Racking circuit breakers in and out of switch gear • Applying safety grounds • Removing and replacing panel covers

  25. Electrical Hazards—Case 1 Photo courtesy of Schneider Electric

  26. Electrical Hazards—Case 2 Photo courtesy of Schneider Electric

  27. Electrical Hazards—Case 3 Photo courtesy of Schneider Electric

  28. Electrical Hazards—Case 4 Photos courtesy of Schneider Electric

  29. Planning for Your Small Business

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