Module 2: Recognizing Electrical Risk Factors

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1. Slide 1

   Module

   • Recognizing
   • Electrical Risk
   • Factors
2. Slide 2

   Recogni ze

   • Evaluate
   • Control
3. Slide 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. Slide 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. Slide 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. Slide 6

   Four Risk Factor Categories

   • Environmen
   • Equipment
   • Work
   • Practices
   • Individual
7. Slide 7

   Environmental Risk

   • Factors
   • Electrical risks that are in the work environme nt
8. Slide 8

   Equipment Risk Factors

   • Electrical risks in the equipmen t at a worksite
9. Slide 9

   Work Practices Risk

   • Factors
   • Electrical risks caused by work requirement s, processes or procedures
10. Slide 10

    Individual Risk Factors

    • Risks that are unique to and caused by the individual
11. Slide 11

    Identifying Electrical

    • Hazards
    • Tailgate
    • meetings
    • and job briefings Checklists
    • Job safety analysis Safety inspections OSHA log analysis Incident investigation logs
12. Slide 12

    Arc Flash

    • Luminous electrical discharge (bright, electrical sparking) through the air that occurs when high voltages exist across a gap between conductors
13. Slide 13

    Arc Blast

    • An explosive release of molten materials from equipment caused by high-amperage arcs
14. Slide 14

    What Happens in an Arc

    • 1. Heat builds to 35,000º Blast?
    • 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. Slide 15

    Arc Blast

16. Slide 16

    Consequences of Arc Blast

    • Skin burns
    • Ignition of clothing Damage of eyesight Hearing loss/ruptured eardrums
    • Lung collapse Concussion/loss of memory
17. Slide 17

    Consequences of Arc Blast— continued

    • Shrapnel wounds
    • Physical wounds
    • Loss of life
    • Lost work time
    • Loss or damage of equipment
18. Slide 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. Slide 19

    Where Does Arc Blast Occur?

    • Panel boards Switchboards Motors Transformers Motor starters Drive cabinets Fused disconnects
20. Slide 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. Slide 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. Slide 22

    Accidental Contact—

    • Example
    • Photo courtesy of Schneider Electric
23. Slide 23

    Accidental Contact—A Better View

    • Photo courtesy of Schneider Electric
24. Slide 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. Slide 25

    Electrical Hazards—Case 1

    • Photo courtesy of Schneider Electric
26. Slide 26

    Electrical Hazards—Case 2

    • Photo courtesy of Schneider Electric
27. Slide 27

    Electrical Hazards—Case 3

    • Photo courtesy of Schneider Electric
28. Slide 28

    Electrical Hazards—Case 4

    • Photos courtesy of Schneider Electric
29. Slide 29

    Planning for Your Small

    • Action
    • Potential
    • Overcoming the
    • Business
    • Barriers
    • Barriers