What is the minimum height for lettering on an emergency disconnecting button for fuel dispensers?

The minimum height for lettering on an emergency disconnecting button for fuel dispensers is established to ensure maximum visibility and accessibility in emergency situations. One inch is considered the minimum height because it allows for clear identification from a reasonable distance, reducing the chance of confusion during critical moments when quick action is needed. This standard is important because emergency procedures must be easily understood, even under stressful conditions, and the size of the lettering plays a significant role in that clarity. Larger lettering, while beneficial, is not always practical or necessary, making one inch a balanced requirement for safety and functionality in the design of fuel dispensing systems.