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

For AEx maD, stated equivalent is Zone 20; governing standard / law is ISA 61241-18, verified against its source on 2026-08-11.

- **Designation:** AEx maD _(verified: appears in the quote below)_
- **Stated equivalent:** Zone 20 _(verified: appears in the quote below)_
- **Governing standard / law:** ISA 61241-18 _(verified: appears in the quote below)_

## What the source says

> AEx maD Zone 20 ISA 61241-18

## 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/).