Classification of ATEX zones - Petzl USA
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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

  • Read the technical notice before viewing the following techniques.
  • It is important to fully understand the information provided in the technical notice before using this complementary information
  • Mastering these techniques requires training.
  • Consult a professional before attempting to perform these techniques on your own.

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