Class II

For Class II, stated equivalent is Zone 20/21/22; meaning is NEC separates dust into Class II (Groups E, F, G); IEC integrates dust into the same zone framework (Zone 20/21/22) with dust groups IIIA, IIIB, IIIC, verified against its source on 2026-08-11.

Designation: Class II verified
Stated equivalent: Zone 20/21/22 verified
Meaning: NEC separates dust into Class II (Groups E, F, G); IEC integrates dust into the same zone framework (Zone 20/21/22) with dust groups IIIA, IIIB, IIIC verified

Sourceexknowledge.com

Verified2026-08-11

Review by2027-08-11

DatasetCertification marks and hazardous-area classifications: cross-market equivalences

What the source says

Dust handling: NEC separates dust into Class II (Groups E, F, G); IEC integrates dust into the same zone framework (Zone 20/21/22) with dust groups IIIA, IIIB, IIIC.

— exknowledge.com, retrieved 2026-08-11

Source

exknowledge.comhttps://exknowledge.com/pages/nec-500-vs-atex-iec.html

Last verified against source: 2026-08-11. Due for re-check by 2027-08-11. This page as Markdown · OKF bundle · full dataset as JSON.