PUE 7, Section 1.2 Power supply — clause by clause

PUE section 1.2: reliability categories (1.2.17–1.2.21), special group of category 1, voltages.

Document

Document	PUE 7, Section 1.2 Power supply
Edition	2002 (ПУЭ-7, разд. 1.2)
Status	Current
Issued by	Ministry of Energy of Russia
Applies to	Power supply and networks: reliability categories

Document structure

№	Chapter / section
1.2.1–1.2.16	General supply requirements
1.2.17–1.2.21	Reliability categories
1.2.22–1.2.33	Voltages, network schemes

Categories (1.2.17–1.2.21)

1.2.17 Category 1: life-threatening consumers — two independent sources, interruption only for ATS time.

1.2.18 Special group: operating theatres, fire pumps, emergency lighting — three independent sources (2 intakes + DG/battery).

1.2.19 Category 2: two sources, interruption for manual transfer time.

1.2.20 Category 3: one source, repair-time interruption.

1.2.21 Residential buildings — no higher than category 2.

Voltages (1.2.22)

127/220/380 V single-phase; 220/380 V three-phase; new networks — 230/400 V.

Data is for reference. Final design decisions must follow current regulations and a qualified engineer.
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