Searching for "iec 6193612021 link" will likely lead you to illegal, outdated, or virus-infected PDFs. Here is the safe path:
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Understanding what the standard covers is as important as knowing its limitations. IEC 61936-1:2021 serves as the guiding link for a vast array of electrical assets commonly found in industrial plants, utility substations, and commercial buildings. iec 6193612021 link
Why is the title so specific? "Exceeding 1 kV." Searching for "iec 6193612021 link" will likely lead
IEC 61936-1:2021 was developed by – "Insulation co-ordination and system engineering of high voltage electrical power installations above 1.0 kV AC and 1.5 kV DC". iec 6193612021 link