# (NI) — Certification marks and hazardous-area classifications: cross-market equivalences

For (NI), market / system is US; stated equivalent is Division 2; meaning is Non-Incendive; applies to is Class I; governing standard / law is ISA 12.12.01/FM 3611, verified against its source on 2026-08-11.

- **Designation:** (NI) _(verified: appears in the quote below)_
- **Market / system:** US _(verified: appears in the quote below)_
- **Stated equivalent:** Division 2 _(verified: appears in the quote below)_
- **Meaning:** Non-Incendive _(verified: appears in the quote below)_
- **Applies to:** Class I _(verified: appears in the quote below)_
- **Governing standard / law:** ISA 12.12.01/FM 3611 _(verified: appears in the quote below)_

## What the source says

> Non-Incendive (NI) US Class I Division 2 ISA 12.12.01/FM 3611

## 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 **Non-Incendive**, as of 2026-08-11.

> Non-Incendive (NI) US Class I Division 2 ISA 12.12.01/FM 3611

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

euroswitch.com says meaning is **Dust Protected**, as of 2026-08-11.

> Dust Protected (NI) US Class II Division 2 ISA 12.12.01 / FM 3611

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


### Applies to

euroswitch.com says applies to is **Class I**, as of 2026-08-11.

> Non-Incendive (NI) US Class I Division 2 ISA 12.12.01/FM 3611

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

euroswitch.com says applies to is **Class II**, as of 2026-08-11.

> Dust Protected (NI) US Class II Division 2 ISA 12.12.01 / FM 3611

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


### Governing standard / law

euroswitch.com says governing standard / law is **ISA 12.12.01/FM 3611**, as of 2026-08-11.

> Non-Incendive (NI) US Class I Division 2 ISA 12.12.01/FM 3611

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

euroswitch.com says governing standard / law is **ISA 12.12.01 / FM 3611**, as of 2026-08-11.

> Dust Protected (NI) US Class II Division 2 ISA 12.12.01 / FM 3611

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/).