If equipped with an overfill alarm it must be located _____.

The requirement for the overfill alarm to be located so that it can be seen and/or heard from the delivery location ensures that personnel involved in refueling operations can easily monitor the status of the tank during delivery. This visibility and audibility are crucial for preventing overfills, which can pose significant safety and environmental hazards. By having the alarm in a location where it is clearly detectable, the risks associated with potential spills can be mitigated effectively.

Placing the alarm in a central control room, underneath the tank, or next to the main entrance would not provide the necessary immediate awareness needed for the delivery personnel, hence reducing their ability to respond promptly to the alarm. The positioning of safety equipment is vital to ensure operational effectiveness and compliance with safety regulations.