Hard hats fit into three industrial classes:
- Class A hard hats resist impact and penetration and protect against electric shocks (up to 2,200 volts)
- Class B hard hats offer the greatest protection against high voltage shocks and burns (up to 20,000 volts). They also save workers from penetration and impact hazards caused by falling/flying objects.
- Class C hard hats offer only impact protection and lightweight comfort but do not provide any protection against electrical hazards.