What essential feature must safety gloves have when working with high voltage systems?

When working with high voltage systems, safety gloves must possess an insulation rating, which is critical for protecting the wearer from electrical shocks and hazards. The insulation rating indicates the gloves' ability to withstand voltages without conducting electricity, thereby preventing potentially severe injuries or fatalities.

The insulation material used in these gloves is specifically designed to resist the flow of electrical current, ensuring that the hands remain safe while working with or near high voltage equipment. Certifications and standards, such as those from the American Society for Testing and Materials (ASTM), help in identifying gloves capable of providing adequate protection.

While features like waterproofing, flexibility, and grip material can enhance the functionality and usability of gloves in various work environments, they do not directly address the paramount concern of electrical safety. Thus, the insulation rating is the most critical feature for anyone operating in environments where high voltage is present.