Which label indicates a shirt safe for electrical work?

The correct label indicating a shirt safe for electrical work is the one that specifies it is made from 100% cotton and states it can be machine washed in cold water. This is significant because cotton is a natural fiber that does not melt or ignite easily, making it safer for electricians who may be exposed to electrical hazards and potential arcing or sparking.

Additionally, the care instructions suggest that the garment is durable enough for typical laundering practices. Shirts made from synthetic materials, such as polyester or wool, may pose a greater risk, as they can melt upon contact with heat or flames, creating additional hazards during electrical work. Thus, a shirt that is 100% cotton and machine washable provides the right type of material and usability expected for such environments.