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

This European Standard specifies the requirements for the construction and testing of flow restricting enclosures for non-electrical equipment intended for use in potentially explosive atmospheres if the atmosphere outside the enclosure becomes explosive rarely and for short durations only.This standard supplements the requirements in EN 13463-1 the contents of which apply in full to equipment constructed in accordance with this standard.Equipment complying with this standard meets the requirements of Group II - Category 3 equipment. The type of ignition protection described in this standard is unsuitable for use in combination with another type of protection to produce equipment of any other category than category 3.