Final answer:
Pull cords are required on conveyor installations for safety reasons. They provide a quick way for workers to stop the conveyor in case of an emergency. Regulations and standards ensure proper use, maintenance, and testing of pull cords.
Step-by-step explanation:
In conveyor installations, the use of pull cords is required for safety purposes. Pull cords are emergency stop devices that are installed along the length of a conveyor belt, and they provide a quick and easy way for workers to stop the conveyor in case of an emergency or a hazardous situation. Pull cords are typically positioned within easy reach and are easily identifiable, usually through their bright colors.
When a pull cord is activated by pulling it, it triggers the conveyor to stop immediately, shutting off power to the motor and bringing the conveyor to a halt. This ensures the safety of workers and prevents potential accidents or injuries.
Regulations and standards, such as the Occupational Safety and Health Administration (OSHA) requirements in the United States, specify the use of pull cords on conveyor installations to ensure worker safety. These requirements ensure that pull cords are properly positioned, well-maintained, and tested regularly to guarantee their effectiveness in emergency situations.