Annex J provides guidance on the end-of-life and replacement of older Silicon Carbide (SiC) gapped arresters. Critical Changes in the 2018 Edition
The modern industry standard utilizing Zinc Oxide (ZnO) varistors, governed structurally by IEC 60099-4 .
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Understanding the context of IEC 60099-5 is easier when you see how it fits into the broader series of standards. The IEC 60099 family is a comprehensive suite of documents that defines the requirements and tests for almost every type of surge arrester:
standard, published by the International Electrotechnical Commission, serves as the primary global guide for the selection and application of surge arresters in three-phase systems with nominal voltages above 1 kV. Scope and Technical Application Annex J provides guidance on the end-of-life and
Surge arresters do not just face electrical stress; they must also withstand harsh environmental conditions. The standard dedicates sections to:
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The Definitive Guide to IEC 60099-5: Selection and Application Principles for Surge Arresters
The arrester must handle the normal system voltage indefinitely without aging. Check Temporary Overvoltages (TOV):