According to OSHA: 29 CFR 1910.135(a)(1) states, "Each affected employee shall wear hard hats when working in areas where there is a potential for injury to the head from falling objects." The standard also covers conditions where electrical hazards are present. 1910.135(a)(2) states, "Protective helmets designed to reduce electrical shock hazard shall be worn by each such affected employee when near exposed electrical conductors which could contact the head." "Affected Employees" are defined by OSHA as "those employees who are exposed to the hazard(s) identified as violation(s) in a citation." This definition has been added to clarify that the term, as used in this regulation, applies specifically to those employees who are put at risk by the safety or health hazard cited by the OSHA Compliance Officer.
Some examples of occupations for which hard hats should be routinely considered are: carpenters, electricians, lineman, mechanics and repairers, plumbers and pipe fitters, assemblers, packers, wrappers, sawyers, welders, laborers, freight handlers, timber cutting and logging, stock handlers, and warehouse laborers.