An article covering the basics of arc flash protection and electrical safety including NFPA 70E
OSHA requires safe work practices, but it is the NFPA 70E®: Standard for Electrical Safety in the Workplace® that specifies safe work practices for arc flash. NFPA 70E Article 130.5(C) requires arc...
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NFPA 70E Arc Flash and Shock Hazard Boundaries Explained
Descripción: ArcFlash-Practical Solution Guide to Arc Flash Hazards
• Short-circuit Calculations for Arc Flash Analysis • Protection and Coordination Principles • Arc Flash Analysis and Mitigation • Upcoming Arc Flash Analysis Standards/Guidelines Changes • DC...Full description
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Flash distillation notes
Arc Flash Awareness NFPA 70E
Michael White Shermco Industries, Inc.
Hazards of Electricity
An Illustrative Story
A 400 Amp, 480-volt Automatic Transfer Switch A Critical Hospital Life-Safety Circuit A Simple Task to Modify the Controls An Experienced Electrical Worker July 18, 1984
Typical Transfer Switch
Electrical Safety Statistics Average of 4,000 non-disabling and 3,600 disabling electrical contact injuries annually in the United States One person is electrocuted in the workplace every day Electrocutions are the 4th leading cause of fatalities. Over 2,000 workers are sent to burn centers each year with electrical-related burn injuries
250 600, 45%
Costs Of An Electrical Fatality
$1,300,000 estimated direct costs
3RD INT’L CONFERENCE ON ELECTRICAL INJURY
Lost production Cost of personnel away from job Increases in Workman ’s Comp Increases in insurance costs OSHA fines Litigation
Costs Of An Electrical Fatality
Pain and suffering of employee Loss to family dependents • Financial and emotional
Total direct and indirect costs estimated at $3,900,00 to $10,400,00 per incident • DR. MARY CAPPELLI-SCHELLPFEFFER
Injury Costs Can Last A Lifetime A study of one utility revealed these costs of a survivable serious electrical injury Immediate direct costs…… $250,000 Direct costs after year 1 ….. $1.3 million Indirect costs ……………… $11.24 million Total ….. $12.8 million*
*1991 dollars. Equivalent in 2003 dollars is $17.4 million – “Facts on Electrical Incident & Injury Costs”, Lanny Floyd II, 11th Annual IEEE Electrical Safety Workshop
On Nov. 24, 1997, employees removed safety guards from energized electrical conductors in the cubicle. Physical evidence indicates that it was likely that part of one of the safety guards touched the energized conductors, causing an electrical explosion with a 26- foot fireball.
After The Arc
Proposed penalties of $455,000 against Western Resources at its Lawrence, Kan., Energy Center
“Management showed a lack of concern about taking the required safety precautions that might have prevented this triple tragedy,” said OSHA Administrator Charles N. Jeffress.
Hazards of an Arc Flash
Rapidly Expanding Vaporized Metal and Air Visible and Invisible Light
Heat Data Curable burn Skin cell death Tin Gasoline Aluminum Copper Carbon steel Sun’s surface Arc flash
145o F 200o F 450o F 800o F 1,200o F 1,981o F 2,700o F 9,000o F 35,000o F
Hot Enough? • 1.0 cal/cm2 is amount of heat produce by a cigarette lighter on finger tip for 1 second
This hazard risk category represents tasks that pose the greatest risk. Use when incident energy is between 25.1 and 40 cal/cm2 .
Would you use this on a class 0,1,2,3?
Knowing how to use your PPE
Mark Your Equipment
Effect on Workers Two workers had 2nd and 3rd degree burns on +60% of their bodies. One of the workers was placed in a druginduced coma for over 60 days. The supervisor initially had minor injuries. He has suffered long-term effects including neurological problems. Three families will never be the same again.
Optional Equipment Marking
Michael White Shermco Industries Phone: 888-SHERMCO