This European Standard specifies the following points regarding the minimum requirements for an overfill prevention system:- functions;- major components;- characteristics;- test methods.This European Standard is applicable to overfill prevention systems for liquid fuels having a flash point up to but not exceeding 100 °C, excluding liquefied petroleum gas (LPG). The requirements apply to overfill prevention systems suitable for use at ambient temperatures in the range from - 20 °C to + 50 °C, subjected to normal operational pressure variations.