Final answer:
Class G hard hats are rated for 2,200 volts and designed for general work, providing protection from impact, penetration, and electrical hazards.
Step-by-step explanation:
The student is asking about the classification of hard hats used for general work purposes, specifically in relation to their electrical insulation properties. Class G hard hats are the ones rated for 2,200 volts. These hard hats are designed to provide both impact and penetration protection while also offering a degree of protection against electrical hazards. This classification system is placed to ensure the safety of individuals working in environments where they might be exposed to high voltage equipment or live wires.