What are the three key requirements when refueling a machine?

The requirement that encompasses all vital safety measures when refueling a machine includes having no open flames within 25 feet, ensuring a fire extinguisher is nearby, and grounding the nozzle before refueling. Each of these measures is crucial in preventing accidents and promoting safety during the refueling process.

Maintaining a distance of 25 feet from open flames minimizes the risk of fire hazards, as flammable vapors can ignite easily. Having a fire extinguisher within reach ensures a swift response in case of an emergency. Grounding the nozzle helps prevent static electricity build-up, which can also lead to fires or explosions when transferring fuel.

Overall, all of these steps help create a safer environment, making them key requirements to follow during the refueling of machines.