# Division 1 — Certification marks and hazardous-area classifications: cross-market equivalences

For Division 1, market / system is NEC and CEC; stated equivalent is Zone 0 / Zone 20, verified against its source on 2026-08-11.

- **Designation:** Division 1 _(verified: appears in the quote below)_
- **Market / system:** NEC and CEC _(verified: appears in the quote below)_
- **Stated equivalent:** Zone 0 / Zone 20 _(verified: appears in the quote below)_

## What the source says

> Type of Area NEC and CEC* ATEX and IEC Definitions General CA Class II Division 1 & 2 US Class III Division 1 & 2 FM 3600 Con nuos A place in which an explosive atmosphere is Requirements Division 1 Zone 0 / Zone 20

## 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.

### Stated equivalent

euroswitch.com says stated equivalent is **Zone 0 / Zone 20**, as of 2026-08-11.

> Type of Area NEC and CEC* ATEX and IEC Definitions General CA Class II Division 1 & 2 US Class III Division 1 & 2 FM 3600 Con nuos A place in which an explosive atmosphere is Requirements Division 1 Zone 0 / Zone 20

Source: https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf

euroswitch.com says stated equivalent is **Zone 1 / Zone 21**, as of 2026-08-11.

> NEC and CEC* ATEX and IEC Definitions General CA Class II Division 1 & 2 US Class III Division 1 & 2 FM 3600 Con nuos A place in which an explosive atmosphere is Requirements Division 1 Zone 0 / Zone 20 CA Class III Division 1 & 2 hazard con nually present Ex US Zone 20, 21, 22 ISA 60079-0 Dust Igni on Proof (DIP) US Class II Division 1 UL 1203 Intermittent A place in which an explosive atmosphere is Division 1 CSA C22.2 No. 25 Division 1 Zone 1 / Zone 21

Source: https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf


## Source

- https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf

Last verified: 2026-08-11. Review by: 2027-08-11.
Part of [Certification marks and hazardous-area classifications: cross-market equivalences](https://referencesource.org/certification-standards-equivalence/).