Final answer:
Safety nets should be installed as close as possible under the working surface, with OSHA allowing a maximum distance of up to 30 feet below the working level to prevent accidents.
Step-by-step explanation:
The question pertains to workplace safety and specifically the installation of safety nets. According to OSHA (Occupational Safety and Health Administration) guidelines, safety nets should be installed as close as possible under the working surface to catch falling workers or objects and prevent accidents. Safety nets can be installed up to 30 feet below the level where the work is being done.