Group B
What is the category for Group B?
For Group B, category is gas group; iec / atex designation is IIC (partially IIB+H₂); basis or note is MESG <0.50 mm, recorded from its source on 2026-08-06.
B | IIC (partially IIB+H₂) | Hydrogen, butadiene | <0.50 mm
— exknowledge.com, retrieved 2026-08-06
- Category
- gas group our reading
- North American designation
- Group B
- IEC / ATEX designation
- IIC (partially IIB+H₂) verified
- Basis or note
- MESG <0.50 mm
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
Source
- exknowledge.comhttps://exknowledge.com/pages/nec-500-vs-atex-iec.html