# T3B — North American vs IEC/ATEX explosion protection designations

For T3B, category is temperature code; maximum surface temperature (c) is 165; basis or note is Ignition temperature of gas / dust >165-180, recorded from its source on 2026-08-06.

- **Category:** temperature code _(our reading, not quoted from the source)_
- **North American designation:** T3B _(verified: appears in the quote below)_
- **Maximum surface temperature (C):** 165 _(verified: appears in the quote below)_
- **Basis or note:** Ignition temperature of gas / dust >165-180
- **Maximum surface temperature (F):** 329 _(per ldpi-inc.com, not stated by the source above)_

## What the source says

> 165 | T3B | >165-180

## What ldpi-inc.com says

> T3B | | 165 | 329

Source: https://ldpi-inc.com/resources/classification-codes/class-1-locations/

## Source

- https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups
- https://ldpi-inc.com/resources/classification-codes/class-1-locations/

Last verified: 2026-08-06. Review by: 2028-08-05.
Part of [North American vs IEC/ATEX explosion protection designations](https://referencesource.org/ex-classification-system-crosswalk/).