Where equipment for head protection is combined with equipment for eye and/or face protection, the individual items of PPE must be compatible. Industrial safety helmet accessories for protection of the eyes must satisfy additional requirements, such as those described in EN 166 governing eye protection (DGUV Regel 112-192 (to date: BGR 192) governing the use of eye and face protection, July 2001, current version February 2006, Section 3.3.2 at www.dguv.de/fb-psa, in German).