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ELECTRIC SHOCK

ELECTRIC SHOCK 300-2.1.2.1.3. > 30 volts can KILLBody resistance can be as low as 300 ohms1 mAmp - shock felt10 mAmp - may cause muscle contraction ? person can't let go100 mAmp - may cause ventricular fibrillation - and death if longer than 1 second. ELECTRIC SHOCK RESCUE 300-2.1.2.2. Do not t

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ELECTRIC SHOCK

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    2. ELECTRIC SHOCK Nationwide - 30,000 work-related non-fatal shocks/year Nationwide - 1,000 deaths/year Navy 2 deaths (sailors) in two years (2009 & 2010) Navy 3 deaths (civilians) in three years (2009, 2010, 2011)

    3. ELECTRIC SHOCK 300-2.1.2.1.3 > 30 volts can KILL Body resistance can be as low as 300 ohms 1 mAmp - shock felt 10 mAmp - may cause muscle contraction person cant let go 100 mAmp - may cause ventricular fibrillation - and death if longer than 1 second

    4. ELECTRIC SHOCK RESCUE 300-2.1.2.2 Do not touch someone being shocked Call for help Secure power immediately Remove them from source with non-conducting material

    5. SHOCK VICTIM RESCUE

    6. ELECTRIC SHOCK RESCUE 300-2.1.2.2 Start CPR See your medical or safety department for training Refer to the Red Cross website http://www.redcross.org

    7. ARC FLASH 300-2.1.2.3 Electric current passing through air gaps between ungrounded conductors or between conductors and grounded components Caused by insulation breakdown or improper spacing between conductors, workers, tools Air temperature can reach 35,000 0F

    8. ARC FLASH 300-2.1.2.3 Cause skin burns and clothing to catch on fire Can kill at distances of 10 feet Nationwide more than 2000 severe burns and hospitalizations/year

    9. ARC BLAST 300-2.1.2.4 Extreme temperature of an arc can cause an explosive expansion of both air and material Copper can expand 67,000 times its volume when changing from solid to a vapor Noise from a blast can exceed 160 dB

    10. ARC BLAST VIDEOS The arc in the first video is less than 4 cal/cm2, 480 volts, 30 amps The arc in the second video is less than 4 cal/cm2, 480 volts, 30 amps, the uniform is not arc rated, similar to dungarees or NWU The arc in the third video is approximately 35 cal/cm2, 600 volts, 200 amps, the suit is a 40 cal/cm2 arc flash suit similar to navy PPE

    11. ARC FLASH EXPLOSIONS

    12. FLASH PROTECTION BOUNDARY (FPB) 300-2.1.2.5 Unobstructed distance from energized circuits to exposed skin Inside FPB can get 2nd degree burns from arcs if no PPE All personnel inside FPB wear same PPE Solid structures part of boundary

    13. FLASH PROTECTION BOUNDARY (FPB) 300-2.1.2.5 Personnel protection from arc Air is good insulator Heat from a short circuit can ionize air Ionized air has low resistance Can lead to current flow, arc, until current flow is eliminated

    14. FLASH PROTECTION BOUNDARY (FPB) 300-2.1.2.5 Navy uses standard FPB for voltage ranges Less than 1000 volts FPB = 4 feet 1000 volts to 5000 volts FPB = 11 feet Greater than 5000 volts FPB = 13 feet For maintenance the electrical safety and FPB are the same distance

    15. QUESTIONS What is the minimum voltage that can kill? What is the minimum amperage that can kill? What is an arc flash? What is an arc blast? What are the required flash protection boundaries?

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