: You can purchase and download the IEC 60099-5:2018 PDF directly from the International Electrotechnical Commission.
Specific to units with series/parallel gaps (52 kV and below), referenced in IEC 60099-6. Externally Gapped Line Arresters (EGLA):
Understanding IEC 60099-5: The Definitive Guide to Surge Arrester Selection and Application
You can verify the latest edition on the IEC website.
: Focusing on units rated 52 kV and below, featuring internal series or parallel gaps.
Older gapped versions are discussed in Annex J. Important Technical Sections
The newest version of IEC 60099-5 includes major revisions to align with the thermal stress and energy evaluation updates found in newer grid components. Shift from Line Discharge Classes to Charge Ratings
The importance of IEC 60099-5 cannot be overstated. Surge arresters play a crucial role in maintaining the reliability and stability of electrical power systems. By standardizing the design and testing of surge arresters, IEC 60099-5 helps ensure that these devices can effectively protect electrical equipment from voltage surges and overvoltages.
Together, these standards define how surge arresters are manufactured, tested, and applied, ensuring uniform safety and performance globally.
The standard has evolved over time. Here are the key editions you should be aware of:
All Rights Reserved © 2026 Sanctuary Group
