Regulatory requirements are contained in 29 CFR 1910.135.
A. When Required: Each affected employee shall wear approved head protection when working in areas where there is a possibility of injury from falling objects.
B. Areas Near Electrical Conductors: Each affected employee shall wear approved head protection when working in areas near exposed electrical conductors which could contact the head.
C. Maintenance, Inspection: Protective helmets shall be regularly cleaned by the affected employee and inspected for defects, such as cracks and dents. Any helmet with damage or defects sufficient to effect its structural integrity, shall be replaced.
D. Storing; Nonapproved Decorations: Protective helmets shall be stored out of direct sunlight, and application of nonapproved decorations, logos or other markings is prohibited. (2019 Compilation)