Which requirement is essential for shirts that are selected as part of protective clothing?

The requirement for shirts to be fastened at the wrists is essential for protective clothing because this measure helps to minimize the risk of exposure to electrical hazards. When sleeves are secured at the wrist, it prevents them from riding up during work or when moving, which could expose the skin to potential arc flash or other electrical hazards. This secure fit ensures a better barrier against debris, sparks, or thermal hazards that may arise in an electrical environment.

In contrast, shirts that are brightly colored, loose-fitting, or equipped with pockets do not directly contribute to the protective functionality required in hazardous situations. While visibility and comfort are important in various work settings, those factors do not specifically address the critical concern of safeguarding against electrical risks. Therefore, the requirement that shirts must be fastened at the wrists stands out as an important safety feature in the context of protective clothing intended for electrical safety.