The latest major update to IEC 60099-5 (Part 5: Selection and application recommendations) is the third edition (2018)
Surge arresters with series and parallel gapped structures rated at 52 kV or less (IEC 60099-6). iec 600995 pdf upd
Obtaining official standards requires adherence to copyright laws. Here is how to legally access the document: The latest major update to IEC 60099-5 (Part
A major selection parameter typically found in Annex F. It determines the level of protection provided to the equipment. Improved communication : Consistent use of letter symbols
It provides recommendations for the selection and application of surge arresters for the protection of AC electrical systems against overvoltages (typically caused by lightning or switching operations).