Where must industrial trucks with permanently mounted fuel tanks be refueled?

The correct answer indicates that industrial trucks with permanently mounted fuel tanks must be refueled outside the building. This requirement is primarily due to safety considerations. Refueling inside a structure poses a significant risk of fire or explosion, particularly with flammable materials like propane.

When refueling outdoors, adequate ventilation is ensured, reducing the concentration of flammable gases and fumes that could accumulate in a confined space. Additionally, outdoor refueling minimizes the risk to personnel in case of a spill or an accidental ignition. It is a critical safety protocol designed to protect both employees and property.

In contrast, refueling inside a building, at a designated refueling station, or at a remote location may not adequately address the safety hazards associated with the flammable nature of propane and other fuels. The chosen option promotes a safe environment by enforcing distance from ignition sources and allowing for effective emergency response should an incident occur.