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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This note was uploaded on 08/17/2009 for the course CEE 698 taught by Professor Dabdoub during the Spring '09 term at University of Cincinnati.

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

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