Employees who interact with electrical equipment and electrical installations may be exposed to electrical shock and arc flash hazards. A previous two-part article titled “Arc Flash Considerations for Utility and Construction Activities” (see https://incident-prevention.com/ip-articles/arc-flash-considerations-for-utility-and-construction-activities and https://incident-prevention.com/ip-articles/arc-flash-considerations-for-utility-and-construction-activities-part-ii) discussed the electrical hazard identification and risk assessment. If the employer has taken steps to reduce the risk of injury or death from electrical hazards but is unable to eliminate the hazard, then OSHA requires the provision of adequate personal protective equipment (PPE). For electrical hazards, both dielectric (insulating) and arc-rated (thermal) PPE is required. This article discusses some of the ASTM International and National Fire Protection Association (NFPA) standards for arc flash-related PPE. Many ASTM standards have equivalent International Electrotechnical Commission (IEC) standards. These standards reference the International Organization for Standardization (ISO), American National Standards Institute (ANSI), American Association of Textile Chemists and Colorists, and so forth. While no one standard may claim superiority over another, it is a best practice to ensure that products meet the local performance specifications. Nearly all North American labs that work with arc-rated (AR) PPE are geared toward performing both local and international testing.