NEN EN 13463-2 : 2004

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General
  4.1 General requirements
  4.2 Determination of suitability
5 Specific requirements and limitations
  5.1 Nature of ignition source
  5.2 Test requirements
  5.3 Enclosures without the provision for carrying out
      checks after installation
  5.4 Enclosures with provisions for carrying out checks
      after installation
  5.5 Resilient gaskets
  5.6 Poured seals and encapsulating compounds
  5.7 Internal fans or similar devices
  5.8 Limits of operation
6 Verifications and tests
  6.1 Preconditioning for seals and gaskets used to maintain
      the flow restricting effect
  6.2 Tests
      6.2.1 Equipment with provisions for checking of flow
            restricting properties
      6.2.2 Equipment without provisions for checking of flow
            restricting properties
      6.2.3 Equipment where the nominal volume of the enclosure
            changes due to pressure
      6.2.4 Routine production test
7 Instructions for use
8 Marking
Annex ZA (informative) Clauses of this European Standard
                       addressing essential requirements or
                       other provisions of EU Directives
Bibliography

Define the construction and testing of flow restricting enclosures for nonelectrical equipment intended for use in potentially explosive atmospheres if the atmosphere outside the enclosure becomes explosive rarely and for short durations only.