1. ©2008 2 - 1 Module 2 ELECTROCUTIONS

2. ©2008 2 - 2 What You Will Learn ►Important facts about electricity ►Important terms relating to electricity ►OSHA regulations relating to working with electricity

3. ©2008 2 - 3 What You Will Learn—continued ►How to identify practices that protect you from electrical injuries ►How to find hazards at work that could cause electrocutions ►How to identify behaviors at work that could cause electrocutions

4. ©2008 2 - 4 Find the Electricity-Related Hazards

5. ©2008 2 - 5 Did You Know? ►About 700 workers get hurt by electricity every year. ►About 350 people die each year in electrical incidents.

6. ©2008 2 - 6 Did You Know? ►Electrical safety is important for all construction workers, not just electricians. ►Construction has more electrocutions than any other industry. ►When an electrocution occurs, there are often no emergency response plans.

7. ©2008 2 - 7 Did You Know? ►About 30% of electrical deaths involve cranes and power lines. ►Overhead power lines are not insulated. They carry tens of thousands of volts. They are dangerous to people working near them.

8. ©2008 2 - 8 1 milliamp (mA)-Barely perceptible 16 mA-Maximum current an average person can grasp and “let go” 20-30 mA-Paralysis of respiratory muscles 100 mA-Ventricular fibrillation threshold 2 Amps-Cardiac standstill and internal organ damage 15/20/30 Amps-Common U.S. household breakers (U.S. Standard 60 Hz) Estimated Effects of AC Currents PATH Harm is related to the path by which current passes through the body. Chart and diagram courtesy of Associated General Contractors of America

9. ©2008 2 - 9 Terms Ground Fault Insulation Ground Fault Circuit Interrupter (GFCI) Lockout/Tagout Grounding Circuit Breaker

10. ©2008 2 - 10 Quiz Question #1 TRUE OR FALSE? It is acceptable not to comply with the manufacturer’s instructions when installing electrical equipment as long as a qualified person does the work.

11. ©2008 2 - 11 Quiz Question #1 Equipment must be installed and used in accordance with instructions included in the listing, labeling or certification. FALSE OSHA 29 CFR 1926.403(b)(2)

12. ©2008 2 - 12 Quiz Question #2 TRUE OR FALSE? Live parts of electrical equipment operating at 50 volts or more must be guarded.

13. ©2008 2 - 13 Quiz Question #2 Live parts of equipment operating at 50 volts or more shall be guarded against accidental contact. TRUE OSHA 29 CFR 1926.403(i)(2)(i)

14. ©2008 2 - 14 Quiz Question #3 TRUE OR FALSE? A temporary worksite has a 120-volt single phase 15-ampere receptacle outlet that’s not a permanent part of the building under construction. Because it is temporary, it is not necessary to use a ground-fault circuit interrupter in that outlet.

15. ©2008 2 - 15 Quiz Question #3 All 120-volt, single-phase 15- and 20- ampere outlets on construction sites, which are not part of the permanent wiring of the structure, shall have approved ground-fault circuit interrupters. FALSE OSHA 29 CFR 1926.404(b)(1)(ii)

16. ©2008 2 - 16 Quiz Question #4 TRUE OR FALSE? If a switch is installed in a wet location, it doesn’t need a weather-proof enclosure as long as people using the switch wear insulated gloves.

17. ©2008 2 - 17 Quiz Question #4 All switches in wet locations must have weatherproof enclosures. FALSE OSHA 29 CFR 1926.405(e)(2)

18. ©2008 2 - 18 Quiz Question #5 TRUE OR FALSE? It is acceptable to use a flexible cord as a substitute for the fixed wiring of a structure.

19. ©2008 2 - 19 Quiz Question #5 Flexible cords and cables shall not be used as a substitute for the fixed wiring of a structure. FALSE OSHA 29 CFR 1926.405(g)(1)(iii)(A)

20. ©2008 2 - 20 What are Your Best Practices? When you use power tools When you work with electricity When you operate equipment around high electric wires

21. ©2008 2 - 21 The Worksite Analysis 1. Identify your work space. 2. Look for hazards. 3.Use a checklist to identify hazards. 4.Discuss problems and corrections with supervisor.

22. ©2008 2 - 22 Electricity-Related Hazards—Case #1

23. ©2008 2 - 23 Electricity-Related Hazards—Case #2 Photo courtesy of Associated General Contractors of America

24. ©2008 2 - 24 Electricity-Related Hazards—Case #3 Photo courtesy of Associated General Contractors of America

25. ©2008 2 - 25 Electricity-Related Hazards—Case #4 Photo courtesy of Associated General Contractors of America

26. ©2008 2 - 26 Concerns at Your Worksite Give examples of how a worker’s behavior could create an electrocution hazard.