EN 50020:2002

1. Scope
2. Normative references
3. Definitions
4. Grouping and classification of intrinsically safe
    apparatus and associated apparatus
5. Intrinsically safe levels of protection of electrical
    apparatus
6. Apparatus construction
7. Components on which intrinsic safety depends
8. Infallible components, infallible assemblies of
    components and infallible connections
9. Diode safety barriers
10. Type verifications and type tests
11. Routine verifications and tests
12. Marking
13. Documentation
Annex A (normative) Assessment of intrinsically safe circuits
Annex B (normative) Spark test apparatus for intrinsically safe
        circuits
Annex C (informative) Measurement of creepage distances,
        clearances and separation distances through casting
        compound and through solid insulation
Annex D (normative) Encapsulation
Annex E (normative) Certification requirements for torches

Specifies the construction and testing of intrinsically safe apparatus, meant for use in potentially explosive atmospheres and for associated apparatus, which is meant for connection to intrinsically safe circuits which enter such atmospheres. Coverage includes: documentation, marking, and diode safety barriers. Also gives detailed definitions and annexes.