Few product certification standards are
CE Marking
EU Directives
Certificate of Conformity
ATEX
Technical File Approval
A potentially explosive atmosphere is composed by air mixtures of gases, vapours, mists or dusts, which can ignite under certain operating conditions.
Equipment and protective systems intended for use in potentially explosive atmospheres cover a quite large range of products, including equipment used on fixed offshore platforms, in petrochemical plants, mines, flour mills and other areas where a potentially explosive atmosphere may be present.
The Equipment and Protective systems intended for use in Potentially Explosive Atmospheres (ATEX) Directive 94/9/EC provides the technical requirements to be applied and the relevant conformity assessment procedures before placing this equipment on the European market. These requirements are given technical expression by "Harmonised Standards", developed by the European Standardisation Organisations.
CEN (for non-electrical equipment) and CENELEC (for electrical equipment) - develop standards which references are presented to and published by the European Commission in the Official Journal of the European Union (OJEU).