Which organization requires the use of approved crane and hoist signals?

The requirement for using approved crane and hoist signals is primarily established by the American National Standards Institute (ANSI). ANSI is responsible for overseeing the development of voluntary consensus standards for various industries, including those related to construction and rigging. The ANSI standards regarding crane and hoist operations outline specific signals designed to ensure clear communication between the operator and the signal person. These signals are crucial for maintaining safety during lifting operations and minimizing the risk of accidents.

In contrast, other organizations listed in the question, such as NIOSH (National Institute for Occupational Safety and Health), EPA (Environmental Protection Agency), and DOT (Department of Transportation), do not specifically focus on crane and hoist signal standards. NIOSH is involved in research and recommendations regarding workplace safety and health, the EPA regulates environmental protection, and the DOT oversees transportation policies. While all these organizations play important roles in safety and regulations, ANSI specifically addresses the standards related to lifting equipment signals used in the rigging and construction industry.