Which Annex in NFPA 70E offers guidance on calculation methods to determine the arc flash boundary and incident energy?

Annex D of NFPA 70E specifically provides guidance on calculation methods to determine the arc flash boundary and incident energy levels. This annex includes detailed methodologies for performing arc flash calculations, which are essential for assessing the potential hazards associated with electrical work. Understanding these calculations helps ensure that workers are adequately protected by determining the appropriate personal protective equipment (PPE) and safe working distances when dealing with electrical equipment.

By following the guidance in Annex D, practitioners can evaluate the risks associated with arc flash incidents and establish proper safety parameters, making it critical for effective safety management in electrical environments. This guidance supports the overall objectives of NFPA 70E, which is to create a safer workplace for those who work with or around electrical systems.