: The 2018 (3rd) edition replaces the 2013 version to align with the new surge arrester classifications introduced in IEC 60099-4:2014. Target Audience
There is of in-copyright IEC standards.
The IEC 60099-5 standard, titled provides critical guidelines for engineers and utility providers. It covers the selection and coordination of surge arresters used in three-phase systems with nominal voltages above 1 kV . iec 600995 pdf link
BSI Standard Publication Sample : A detailed preview of the British adoption of this international report. Notable Features of the Report : The 2018 (3rd) edition replaces the 2013
: The primary source for IEC 60099-5:2018 . It covers the selection and coordination of surge
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Since IEC standards are copyrighted, official full versions are typically paid documents. You can find them at the following authoritative repositories: