Classification of ATEX zones - Petzl Denmark
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Classification of ATEX zones

ATEX zones are classified according to two parameters: - the types of combustibles that may be encountered (dust or gas) - the frequency or duration during which an explosive atmosphere is likely to occur.

Warnings

  • Carefully read the Instructions for Use used in this technical advice before consulting the advice itself. You must have already read and understood the information in the Instructions for Use to be able to understand this supplementary information.
  • Mastering these techniques requires specific training. Work with a professional to confirm your ability to perform these techniques safely and independently before attempting them unsupervised.
  • We provide examples of techniques related to your activity. There may be others that we do not describe here.

Classification of ATEX zones

Explosive atmosphere Gas type combustible substance Dust type combustible
Present permanently or for long periods

(more than 1000 h per year)
ZONE 0 ZONE 20
Present occasionally

(more than 10 h and less than 1000 h per year)
ZONE 1 ZONE 21
Present accidentally

(less than 10 h per year)
ZONE 2 ZONE 22

ATEX zoning example:

ATEX zoning example:
ATEX zoning example:

The zones must be marked with clear and visible warning signs:

ATEX zoning warning signs