Every Line of Defense 2015 NFPA 70E and arc flash risk assessment

摘要

The long'awaited arc flash study has been completed, and the results indicate the prospective incident energy at the main switchgear is 34 calories per centimeter squared (cal/cm~2). That means the 40 cal/cm~2 "moon suit" will be required if energized work is to be performed there. Sound familiar? An arc flash study should be more than just incident-energy calculations and recommendations for personal protective equipment (PPE) including protective clothing. The study should also include recommendations for reducing or eliminating the hazard and risk.