BS EN 50411-3-4:2019 pdf free.Fibre management systems and protective housings to be used in optical fibre communication systems - Product specifications. 1.2 Operating environment The tests selected, combined with the severity and duration, are representative of indoor and outside plants for above ground environments defined by EN IEC 61753-1: category C: Controlled (indoor) environment; -category A: Aerial (above ground) environment....
