PZH R1* is a lightning arrester according to standard EN 61643-11 ed.2 (IEC 61643-11:2011) consisting of multiple non-exhausting spark gaps. Its parameters enable usage in buildings with a considerable level of protection LPL I, such as big industrial complexes and properties of particular importance – hospitals, banks, power plants or buildings with explosion danger. The device is to be installed on the interface of LPZ 0 – LPZ 1 zones according to standard EN 62305 ed.2 (IEC 62305:2010), closest to where the overhead line enters the building i.e. the electric power substation, electrometer or the main distribution boards.