Because the PUE is not a single document but a collection of chapters, you can find the most accurate and "official" versions on government-linked databases:
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: Updates to Chapter 2.5 regarding the design and requirements for overhead power lines above 1 kV. Where to Access Official Documents Because the PUE is not a single document
: Amendments to Chapter 7.1 (Section 7) now permit the use of aluminum alloys for wiring in residential and public buildings under specific conditions. : What is frequently marketed as "PUE 2017"
: The Ministry of Energy of the Russian Federation has clarified that all sections of the 6th and 7th editions are currently in force.
: What is frequently marketed as "PUE 2017" or "PUE 8" is typically a collection of the 6th and 7th editions updated with specific amendments made in December 2017, such as those introduced by Ministry of Energy Orders No. 1196 and No. 1197.
While no new edition was released, several critical changes were enacted in late 2017 that appear in modern PDFs: