“Class” for hardhats is a measure of the hat’s ability to resist electrical current and is also determined by standards provided by ANSI/ISEA in the United States. Hardhat classes include Class E (Electrical), Class G (General), and Class C (Conductive). Class E is the highest electrical rating and the hats are tested to 20,000 volts. Class G is tested to 2,200 volts. Finally, Class C does not provide for any electrical protection.