Introduction to Arc Flash.ppt

Introduction to Arc Flash Worker Training of Electrical Hazards Including Arc Flash SH-16614-07 This material was produced under grant number SH-16614-07 from the Occupational Safety and Health Administration, U.S. Department of Labor. It does not necessarily reflect the views or policies of the U.S. Department of Labor, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government. Overview Introduction Revisions to the NFPA 70E Electrically Safe Work Conditions Energized Electrical Work Permit Flash Protection Boundary and Limits of Approach NFPA 70E Boundaries and Spaces Flash Protection Calculations Choosing Correct PPE Reducing the Arc Flash Hazard Introduction What is Arc Flash? Arc flash results from an arcing fault, where the electric arcs and resulting radiation and shrapnel cause severe skin burns, hearing damage, and eye injuries. Introduction Why are we so interested in Arc Flash now? Numerous workers are injured and/or killed each year while working on energized equipment. Many of these casualties are a result of arc flash. Working on energized equipment has become commonplace in many industries. Introduction Injuries that can result from an arc flash: Burns Respiratory system damage Hearing damage Skin penetration from flying debris Eye and face injuries Introduction Introduction A First Degree Burn is red and sensitive to touch. There is minimal skin damage and only the skin surface is involved. Example: Sunburn Introduction A Second Degree Burn involves the first and second layers of skin. The skin reddens intensely and blisters develop. Severe pain and swelling occur and chance for infection is present. Introduction A Third Degree Burn causes charring of skin and coagulation of blood vessels just below the skin surface. All three layers of skin are affected. Extensive scarring usually results. Introduction Skin damage will occur based on the intensity of the heat generated by an electrical ar