This International Standard specifies requirements for a performance-related classification system for safety signs according to expected service environment, principal materials, photometric properties, means of illumination, fixing methods and surface. Performance criteria and test methods are specified in this International Standard so that properties related to durability and expected service life can be characterized and specified at the time of the product’s delivery to the purchaser. This International Standard does not cover electrical power supplies, their components or electrically powered elements. It also does not cover properties of illuminating components, but the photometric properties for the particular types of safety signs are covered.