![]() ![]() This Electrical Safety Program applies to all OSHA employees covered by the OSHA Field Safety and Health Manual.Ģ9 Code of Federal Regulations 1910 Subpart S, ElectricalĢ9 Code of Federal Regulations 1926 Subpart K, ElectricalĢ9 Code of Federal Regulations 1926 Subpart V, Electric Power Transmission and DistributionĢ9 Code of Federal Regulations Section 1910.147, The Control of Hazardous Energy (Lockout/Tagout)Ģ9 Code of Federal Regulations Section 1910.269, Electric Power Generation, Transmission, and Distribution It also describes electrical safety training requirements for all OSHA employees covered by the OSHA Field Safety and Health Manual. It is supplemented by Chapter 13, Control of Hazardous Energy Sources (Lockout/Tagout) and pertinent electrical safety work practices required by. This Program provides specific guidance to OSHA employees who may perform work on or near energized and deenergized electrical equipment operating at 50 or more volts. Safe work practice guidance in this Program is based on OSHA employees’ work activities and the potential for exposure to electrical hazards. OSHA employees may encounter equipment and circuits that are energized or have the potential for energization while performing expected work activities. OSHA expects Regions, DTSEM, and DTE to develop specific procedures that align with this Program as needed. The policies and procedures in this Program are intended to set broad expectations for preventing employee injury or death from electrical hazards. As with approach boundary formulas, use of the IEEE spreadsheet should be the responsibility of an electrical engineer.This chapter establishes the OSHA Field Safety and Health Management System (SHMS) Electrical Safety Program. Using the IEEE spreadsheet-based calculator.Human error is a potential factor when using such formulas. Note these formulas are complex, require detailed information, and should only be performed by qualified electrical engineers. Using approach boundary formulas available in IEEE Standard 1584 or NFPA 70e ®.Using software designed to calculate arc flash boundaries and create one-line diagrams and approach boundaries required by NFPA 70e.Several ways to do this exist, including: Additionally, an employee who has received on-the-job training and has the ability to perform such duties safely may work within the limited approach boundary under the direct supervision of qualified personnel.ĭetermining Arc Flash Approach BoundariesĪpproach boundaries must be calculated for equipment representing an arc flash hazard. To be qualified to work within arc flash boundaries an employee must have proper electrical safety training, be able to demonstrate the skills needed for safely operating equipment, and an understanding of the hazards involved. 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. 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. ![]()
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