: While primarily focused on systems above 1 kV, it provides the mathematical and logical framework used throughout the IEC 60099 series 3. Core Technical Principles Non-Linearity
The third edition, released in 2018, introduced a significant technical revision to align with changes in the manufacturing and testing of modern arresters: IEC Webstore New Charge Classification iec 600995 pdf upd
: Including those with series and parallel gaps rated 52 kV and less, as defined by IEC 60099-6. : While primarily focused on systems above 1
While IEC 60099-5 itself has not been updated since 2018, several supporting documents have recently been released: Here's a report based on the standard: Instead
IEC 60027 (not 600995, I assume that's a typo) is a standard for "Letter symbols to be used in electrical technology". Here's a report based on the standard:
Instead of chasing a ghost file, consider these professional routes to get the legitimate "UPD" version:
Provides recommendations for insulation coordination and protecting equipment like transformers and shunt capacitor banks. :