PUE 7, Chapter 7.3 Explosive zones — clause by clause

PUE 7.3: zone classes B-I…B-IIa, gas groups IIA/IIC, temperature classes T1–T6, Ex equipment.

Document

Document	PUE 7, Chapter 7.3 Explosive zones
Edition	2003 (ПУЭ-7, гл. 7.3)
Status	Current
Issued by	Ministry of Energy of Russia
Applies to	Explosive zones: classes B-I…B-IIa, Ex equipment selection

Document structure

№	Chapter / section
7.3.1–7.3.20	General, definitions
7.3.38–7.3.53	Zone classification
7.3.54–7.3.90	Ex equipment selection
7.3.97–7.3.130	Luminaires, cables, earthing

Zones (7.3.38–7.3.53)

B-I — gases in normal operation; B-Ia — only under faults; B-Ig — outdoor; B-II/B-IIa — dust.

Equipment (7.3.54–7.3.90)

Ex equipment by gas group (I, IIA, IIB, IIC) and temperature class (T1–T6); protection types: flameproof "d", intrinsic safety "i", increased safety "e".

Cables and earthing (7.3.97–7.3.130)

Flame-retardant cables, sealed glands; all metal parts earthed.

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