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Arc Blast Hazards

机译：电弧爆炸危险

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While metal-clad enclosures often provide excellent protection from the devastating potential of electrical arc blasts, electrical workers and engineers need to understand the limitations of such enclosures to protect the workers on the job. Several circumstances can compromise the integrity of metal-clad enclosures, although most are predictable, meaning arc blast hazards can be effectively controlled. The most effective means to control arc blast hazards is to either eliminate or mitigate incident energy levels through engineering interventions such as AFHA plus proper equipment design, installation and proper periodic preventive maintenance. PPE such as FR clothing should always be viewed as a last resort and used only to control residual hazards that remain after all reasonable efforts to mitigate incident energy have been exhausted. NEC 110.16 requires proper AFHA labeling at each facility. Workers must also be trained to properly interpret AFHA labels and know appropriate safe work procedures. Several instances occur where effectively protecting workers will require that workers exceed minimum standards as set forth by OSHA and the NFPA 70E. It is critical to understand that safe work practices set minimum standards and that proper training and good judgment are necessary to work safely with electrical energy. Additional research in equipment enclosure development and methods of reducing incident energy exposures is needed to more effectively protect electrical workers. The integrity of electrical enclosures must be tested with specific emphasis on deriving methods for predicting when arc blast events will exceed the design limitations of electrical enclosures.
机译：虽然金属外壳通常可提供出色的保护，防止遭受巨大的电弧爆炸，但电气工人和工程师需要了解此类外壳的局限性，以保护工作中的工人。尽管大多数情况都是可以预见的，但在多种情况下都可能损害覆金属外壳的完整性，这意味着可以有效控制爆炸危险。控制电弧爆炸危险的最有效方法是通过AFHA等工程干预措施加上适当的设备设计，安装和适当的定期预防性维护，消除或减轻入射能级。诸如FR服装之类的PPE应始终被视为不得已而为之，仅用于控制在尽一切努力减少入射能量后仍然存在的残留危险。 NEC 110.16要求每个工厂都贴有正确的AFHA标签。还必须培训工人正确解释AFHA标签并了解适当的安全工作程序。在有效保护工人的几种情况下，要求工人超过OSHA和NFPA 70E规定的最低标准。至关重要的是要了解安全的工作规范设定了最低标准，并且正确的培训和良好的判断对于使用电能安全地工作是必需的。需要对设备外壳开发和减少入射能量暴露的方法进行更多研究，以更有效地保护电气工人。必须对电气外壳的完整性进行测试，并特别侧重于推导方法，以预测何时爆炸事件将超出电气外壳的设计限制。

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