No-one should be within this boundary while equipment is energized. The NFPA 70e ® considers the inner arc flash boundary-the prohibited approach boundary-as the distance from an exposed energized component where the effects of an electric arc would be the same as actually touching the live part. Only qualified individuals with energized electrical work permits can work within the restricted approach boundary. The closer an employee is to exposed electrical components the greater the risk of serious arc flash injuries. An unqualified person wearing appropriate PPE can also enter the boundary, but only if escorted at all times by a qualified individual, and then only if informed of arc flash hazards. Qualified workers wearing appropriate personal protective equipment (PPE) can enter the limited approach boundary. The exact dimensions of the limited approach boundary are determined by the equipment’s incident energy risk assessment. Should an arc flash occur, people in the limited approach boundary would be exposed to curable second degree burns of 1.2 calories/cm2. NFPA 70e ® defines the limited approach boundary (also known as the flash protection boundary) as the farthest point at which a shock hazard exists. The NFPA 703 ® recognizes three arc flash boundary levels: the limited approach boundary, the restricted area, and the prohibited area boundary. To lower the risk of arc flash injuries, the National Fire Protection Association ® developed a set of arc flash boundary limits to guide decisions on both equipment operation and personal protective equipment. The results of an arc flash are explosive and violent, and can leave anyone in its path with serious injuries or death. It should be required for all electricians.Arc flash describes a dangerous event which occurs when electric current leaves its intended path and arcs through the air until making contact with another conductor or the ground. It also reminds qualified electrical workers about the steps they can take to ensure co-workers remain safe while electrical work is ongoing. This important training helps electrical workers become familiar with the updates in the 2015 NFPA 70E standards and how to apply them when performing electrical work. The NFPA Hazard risk categories are addressed and the types of personal protective equipment required for each hazard risk category is explained. A thorough discussion of arc-rated clothing and equipment is provided, along with the risks of failing to use appropriate arc-rated clothing. Learn about the boundary necessary to protect against injury from an arc flash and where to find the defined boundaries in the standard. Qualified electrical workers learn about limited, restricted and prohibited approach boundaries to provide protection from electric shock and arc flashes. It explains when energized work is allowed, and what is required to obtain an energized electrical work permit. It discusses the dual hazards of electricity, defines an electrically safe work condition through a de-energized state, and how to test to verify no voltage exists. This course provides an overview of the National Fire Prevention Association (NFPA) 70E standards that facilitate electrical worker safety.
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