Limits for environmental stress to prevent premature mechanical or electrical failure. 2. Rating and Performance Characteristics
Standard requirements apply up to 1,000 meters above sea level. Beyond this, dielectric strength corrections must be applied due to thinner air. iec 618691 pdf
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Downloading copyrighted standards from unauthorized third-party websites is illegal and poses cybersecurity risks (malware embedded in PDFs). For professional engineering and compliance purposes, the official, watermarked PDF from the IEC or a national standards body (like ANSI, BSI, or DIN) should be used. iec 618691 pdf
