BS EN IEC 60099-5:2018

What is BS EN IEC 60099-5 on Surge arresters about?  

BS EN IEC 60099-5 is an international standard that covers guidelines for surge arresters.   
BS EN IEC 60099-5 provides information, guidance, and recommendations for the selection and application of surge arresters to be used in three-phase systems with nominal voltages above 1kV.   
BS EN IEC 60099-5 applies to gapless metal-oxide surge arresters as defined in IEC 60099-4, to surge arresters containing both series and parallel gapped structures, rated 52 kV. Metal-oxide surge arresters with the external series gap for overhead transmission and distribution lines (EGLA) as defined in IEC 60099-8. It also discusses some aspects regarding the old type...