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Section 4 of the standard details TOV capabilities. It provides formulas and curves to calculate the TOV capability of an arrester.
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Trade associations sometimes publish summaries or application guides (e.g., Battery Council International for IEC 60095). These are free but non-normative.
If your budget is tight but you need the technical content of IEC 60099-5, consider these legitimate alternatives: Purchase or borrow:
Platforms like IEC Navigator, IHS Markit (now part of S&P Global), Techstreet, or Perinorm offer annual subscriptions. For a few thousand dollars per year, you get unlimited access to all IEC standards in PDF format. This is the most cost-effective option for companies.