Older iterations graded arresters on a strict Line Discharge Class (Classes 1 through 5). The updated framework aligns explicitly with mechanical and physical realities, switching to energy stress criteria based on: Thermal Charge Rating ( Qthcap Q sub t h end-sub
A: The stability date for the 2018 edition is 2027 . This means the technical content is expected to remain valid until at least 2027, though it could be amended or revised sooner if technology changes rapidly.
: The standard covers various types of surge arresters, including gapless and gapped arresters, and their application in different power systems. iec 600995 pdf link
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The standard is named Surge arresters – Part 5: Selection and application recommendations . It is published by the International Electrotechnical Commission (IEC) . The standard applies to three-phase power systems. These systems operate at voltages above 1 kV . Older iterations graded arresters on a strict Line
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Technical Excerpt (2013 Edition) : Covers critical selection criteria for lightning and switching impulse protection. : The standard covers various types of surge
The primary purpose of the standard is to assist system engineers in selecting the correct arrester characteristics to ensure optimal equipment protection while avoiding premature failure of the arrester itself. Key Content in IEC 60099-5 Ed 3.0