PUE 7, Section 1.3 Conductor selection — clause by clause

PUE section 1.3: ampacity tables (1.3.4–1.3.7), economic current density, voltage drop check.

Document

Document	PUE 7, Section 1.3 Conductor selection
Edition	2002 (ПУЭ-7, разд. 1.3)
Status	Current
Issued by	Ministry of Energy of Russia
Applies to	Conductor selection: heating, ampacity (tables 1.3.4–1.3.7), economic density

Document structure

№	Chapter / section
1.3.1–1.3.9	General, heating
1.3.10–1.3.21	Ampacity tables
1.3.22–1.3.33	Economic density, voltage drop

General (1.3.1–1.3.9)

Conductors must satisfy heating limits: normal, emergency, post-emergency modes.

Ampacity (1.3.10–1.3.21)

3-core copper cable in conduit: 1.5 mm² — 14–19 A; 2.5 mm² — 21–27 A; 4 mm² — 28–38 A; 6 mm² — 36–46 A; 10 mm² — 50–70 A. Open — ~20–30% higher. Aluminium — ~25–30% lower. Ambient correction per table 1.3.3.

Economic density (1.3.22–1.3.33)

Copper 2.0–2.5 A/mm² (table 1.3.36); voltage drop check per 1.3.28.

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