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

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1 CHAPTER NINE
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2
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3 Electrical Injuries There are four main types of electrical injuries: Direct: Electrocution or death due to electrical shock Electrical shock Burns Indirect: Falls
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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)
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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
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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
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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 Unsafe work
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8 Hazard – Exposed Electrical Parts Cover removed from wiring or breaker box
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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
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10 Control – Isolate Electrical Parts - Cabinets, Boxes & Fittings Conductors going into them must be protected, and unused openings must be closed
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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)
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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 extension cord Wire Gauge WIRE Wire gauge measures wires ranging in size from number 36 to 0 American wire gauge (AWG)
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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 extension cord Must be 3-wire type and designed for hard or extra-hard use
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14 Hazard – Defective Cords & Wires Plastic or rubber covering is missing Damaged extension cords & tools
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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
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16 Control – Cords & Wires
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