SIMPLE DESIGN (CATEGORY I) : For areas of ‘minimal risk’ which are not suitable to
protect against any form of hazard. Such products are self-certified.

INTERMEDIATE DESIGN (CATEGORY II) : For areas of specific risk i.e. mechanical risks. Such products will have been EC type tested against European test methods and certified by a notified body.

COMPLEX DESIGN (CATEGORY III) : For areas/applications than can seriously or irreversibly harm the health. Such products, in addition to the CE type test, will also have to be either produced under an approved quality system OR be type tested on an annual basis.