Group C
For Group C, category is gas group; iec / atex designation is IIB; basis or note is MESG 0.50–0.90 mm, recorded from its source on 2026-08-06.
- Category
- gas group our reading
- North American designation
- Group C
- IEC / ATEX designation
- IIB verified
- Basis or note
- MESG 0.50–0.90 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.
What the source says
C | IIB | Ethylene, ethyl ether | 0.50–0.90 mm
— exknowledge.com, retrieved 2026-08-06
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
Basis or note
exknowledge.com says basis or note is MESG 0.50–0.90 mm, as of 2026-08-06.
C | IIB | Ethylene, ethyl ether | 0.50–0.90 mm
https://exknowledge.com/pages/nec-500-vs-atex-iec.html
ldpi-inc.com says basis or note is Ethylene, as of 2026-08-06.
Ethylene | C | 450 | 842 | 1,200 PSI | IIB
https://ldpi-inc.com/resources/classification-codes/class-1-locations/
Sources
- exknowledge.comhttps://exknowledge.com/pages/nec-500-vs-atex-iec.html
- ldpi-inc.comhttps://ldpi-inc.com/resources/classification-codes/class-1-locations/