# AEx nC — Certification marks and hazardous-area classifications: cross-market equivalences

For AEx nC, market / system is US; stated equivalent is Zone 2; meaning is Enclosed Break; applies to is Class I; governing standard / law is ISA 60079-15, verified against its source on 2026-08-11.

- **Designation:** AEx nC _(verified: appears in the quote below)_
- **Market / system:** US _(verified: appears in the quote below)_
- **Stated equivalent:** Zone 2 _(verified: appears in the quote below)_
- **Meaning:** Enclosed Break _(verified: appears in the quote below)_
- **Applies to:** Class I _(verified: appears in the quote below)_
- **Governing standard / law:** ISA 60079-15 _(verified: appears in the quote below)_

## What the source says

> Enclosed Break AEx nC US Class I Zone 2 ISA 60079-15

## 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.

### Meaning

euroswitch.com says meaning is **Enclosed Break**, as of 2026-08-11.

> Enclosed Break AEx nC US Class I Zone 2 ISA 60079-15

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

euroswitch.com says meaning is **Limited Energy**, as of 2026-08-11.

> Limited Energy AEx nC US Class I Zone 2 ISA 60079-15

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/).