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hard hats, or protective helmets, must consist of a shell and suspension system. The shell is the outside of a hard hat. It is rounded in shape to protect the crown of the head. A suspension system is used to prevent the hat from falling off and is usually in the form of a head band placed inside the hard hat. When used properly, the shell and suspension system work symbiotically to absorb the force from a strike to the head. Hard hats must be made out of water-resistant and slow burning material.
Types
There are two types of hard hats:
Type 1: reduces impact from a blow to the top of the head.
Type 2: protects from blows to the top of the head and the sides of the head.
Classes
Class A helmets provide electrical protection from low-voltage conductors (less than 2,200 volts).
Class B helmets provide electrical protection from high voltage conductors (less than 20,000 volts).
Class C helmets provide only impact and penetration protection and since they are usually made of aluminum, which conducts electricity, that should not be used around electrical hazards.
Regulation
In the US, Protective helmets must comply with ANSI Z89.1. [29 CFR 1915.155(b)(1)and (b)(2)]
Maintenance & disposal
Storage
limited exposure to extreme temperatures and UV rays
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