Each year there are thousands of head injuries that could have been prevented. Injuries range from major concussion to death, minor abrasions to trauma, or even electrocution. OSHA has developed regulations governing the use of hard hats which can be found at 29 CFR 1910.135. In addition, consensus standards for head protection are found in ANSI Z89.1 - Protective Headwear for Industrial Workers. ANSI Standard Z89.1-1969 (which is incorporated by reference in 1910.135) places hard hats into three classes: A, B, and C. ANSI Z89.1-1969 also specifies two types of hard hats: 1 (full brim) and 2 (no brim). In 1997, ANSI released ANSI Z89.1-1997. This standard revised the types and classes of hard hats. You may find these new designations when you purchase new hard hats. Under ANSI Z89.1-1997, type 1 helmets reduce the force of impact resulting from a blow only to the top of the head, and type 2 helmets reduce the force of impact resulting from a blow which may be received off center or to the top of the head. In addition, the classes for hard hats under ANSI Z89.1-1997 are: G (General), E (Electrical), and C (Conductive). Helmets for employees exposed to high voltage electrical shock and burns must meet the requirements found in ANSI, Z89.2-1971.