PUE 7, Chapter 2.1 Wiring — clause by clause

Clause-by-clause review of PUE chapter 2.1: open and concealed wiring, conduit and trunking, joints, earthing of metal enclosures, wooden houses.

Document

Document	PUE 7, Chapter 2.1 Wiring
Edition	2002 (ПУЭ-7, гл. 2.1)
Status	Current
Issued by	Ministry of Energy of Russia
Applies to	Wiring up to 1 kV: open, concealed, in conduit and trunking

Document structure

№	Chapter / section
2.1.1–2.1.15	Scope, terms
2.1.16–2.1.20	Selection of wiring type
2.1.21–2.1.30	Open and concealed wiring
2.1.31–2.1.44	Conduit and trunking installation
2.1.45–2.1.64	Joints, branches, earthing

General (2.1.1–2.1.15)

2.1.1 Applies to power, lighting and secondary circuits up to 1 kV.

2.1.5 Open wiring — on surfaces; concealed — inside structures.

Selection (2.1.16–2.1.20)

2.1.19 Sections by current, strength and heating; copper from 1.5 mm².

Open and concealed (2.1.21–2.1.30)

2.1.21–22 Heights: unprotected 2 m, protected/cables 0.5 m.

2.1.23 Concealed in walls — in conduit/chases with protection.

2.1.28 Wall/floor penetrations — in sealed conduit.

Conduit and trunking (2.1.31–2.1.44)

2.1.37 All conductors of a circuit in one conduit.

2.1.38 Conduit ID ≥ 1.5 × cable diameter.

2.1.44 Joints only in junction boxes; no welding hidden in walls.

Joints and earthing (2.1.45–2.1.64)

2.1.45 Joints: welding, crimping, soldering, screw/spring terminals.

2.1.52 Metallic conduits — continuous earthing path.

2.1.58–59 Wooden houses: metal conduits or flame-retardant cable (NYM, VVGng).

Practical takeaways

Chapter 2.1 is the technical basis of any wiring job: sections, conduit sizing 1.5×, joints in boxes (2.1.44), conduit earthing (2.1.52), wooden-house rules (2.1.58–59).

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