Chapter 9 - 1 CHAPTER NINE 2 3 Electrical Injuries There...

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Unformatted text preview: 1 CHAPTER NINE 2 3 Electrical Injuries There are four main types of electrical injuries: Direct: Electrocution or death due to electrical shock Electrical shock Burns Indirect: Falls 4 Electrical Shock An electrical shock is received when electrical current passes through the body. You will get an electrical shock if a part of your body completes an electrical circuit by Touching a live wire and an electrical ground, or Touching a live wire and another wire at a different voltage. Shock Severity: Severity of the shock depends on: Path of current through the body Amount of current flowing through the body (amps) 5 Burns Most common shock-related injury Occurs when you touch electrical wiring or equipment that is improperly used or maintained Typically occurs on hands Very serious injury that needs immediate attention 6 Falls Electric shock can also cause indirect injuries Workers in elevated locations who experience a shock may fall, resulting in serious injury or death 7 Electrical Hazards and How to Control Them Electrical accidents are caused by a combination of three factors: Unsafe equipment and/or installation, Workplaces made unsafe by the environment, and 8 Hazard Exposed Electrical Parts Cover removed from wiring or breaker box 9 Control Isolate Electrical Parts Use guards or barriers Replace covers Guard live parts of electric equipment operating at 50 volts or more against accidental contact 10 Control Isolate Electrical Parts - Cabinets, Boxes & Fittings Conductors going into them must be protected, and unused openings must be closed 11 Control Close Openings Junction boxes, pull boxes and fittings must have approved covers Unused openings in cabinets, boxes and fittings must be closed (no missing knockouts) 12 Hazard - Inadequate Wiring Hazard - wire too small for the current Example- portable tool with an extension cord that has a wire too small for the tool The tool will draw more current than the cord can handle, causing overheating and a possible fire without tripping the circuit breaker The circuit breaker could be the right size for the circuit but not for the smaller-wire Wire Gauge WIRE Wire gauge measures wires ranging in size from number 36 to 0 American wire gauge (AWG) 13 Control Use the Correct Wire Wire used depends on operation, building materials, electrical load, and environmental factors Use fixed cords rather than flexible cords Use the correct Must be 3-wire type and designed for hard or extra-hard use 14 Hazard Defective Cords & Wires Plastic or rubber covering is missing Damaged extension cords & tools 15 Hazard Damaged Cords Cords can be damaged by: Aging Door or window edges Staples or fastenings Abrasion from adjacent materials Activity in the area Improper use can cause shocks, burns or fire 16 Control Cords & Wires Insulate live wires...
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Chapter 9 - 1 CHAPTER NINE 2 3 Electrical Injuries There...

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