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Electrical Safety

Electrical Safety. Introduction. Rural and domestic electrical systems cause many injuries and electrocutions each year. Electrocutions are 5% of worker deaths. 40% of deaths caused by contact with overhead power lines. It is important to know how to work with and around electricity safely.

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Electrical Safety

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  1. Electrical Safety

  2. Introduction • Rural and domestic electrical systems cause many injuries and electrocutions each year. • Electrocutions are 5% of worker deaths. • 40% of deaths caused by contact with overhead power lines. • It is important to know how to work with and around electricity safely.

  3. Electrical Safety Conclusion: Humans are always at risk. How do we prevent electrical accidents. Safety is freedom from accidents. Accidents are caused by hazards. Whenever humans are exposed to hazards there is a potential (risk) that the hazard will cause an accident. Humans are always exposed to hazards.

  4. Electrical Hazards • Four (4) primary electrical hazards • Burns • Shock • Ventricular fibrillation • Electrocution

  5. Electrical Burns What principles of safety does this equation demonstrate? Electricity passing through resistance generates heat. Human tissue has resistance. Electricity passing through human tissue can generate sufficient heat to destroy the tissue.

  6. Electrical shock • 1. An electrical shock is defined as sufficient current to be detected, but insufficient current to cause tissue or nerve damage. • Injuries are usually secondary because the electrical shock causes the muscles to contract. • Knock off ladder • Strike against objects

  7. Ventricular fibrillation 120V, 60 hertz currents as low as 60 mA passing through the chest can stop the heart from working effectively. Currents over 200mA cause the heart muscles to seize.

  8. Electrocution • The lethality of an electrical shock is influenced by six factors. • Magnitude of Current • Duration • Frequency of current • Pathway • Phase of heart cycle • Body mass

  9. Managing Electrical Risk Electrical risk is manage by following best management practices for electricity. What are the best management practices for electricity?

  10. Codes and Safety • The source of information for the safest installation of electrical service and components is the National Electric Code (NEC). • Published by the National Fire Protection Association (NFPA). • Note: many rural areas do not have local or state agencies to enforce NEC regulations. But: • The NEC should be used for safety reasons and because insurance companies may deny coverage or charge a higher rate for buildings that do not met NEC standards. • Example: Minimum clearance distance for grain storage bins or buildings (Table 1-1.)

  11. Resources http://www.osha.gov/SLTC/electrical/index.html http://ehs.okstate.edu/modules/electric/index.htm

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