This part of IEC 60079 contains specific requirements for the construction, testing and
marking of electrical equipment, parts of electrical equipment and Ex components in the type
of protection powder filling “q”, intended for use in explosive gas atmospheres.
NOTE 1 Electrical equipment and Ex components protected by powder filling “q” may contain electronic circuits,
transformers, protection fuses, relays, intrinsically safe electrical apparatus, associated electrical apparatus,
switches, etc.
NOTE 2 Type of protection powder filling “q” provides equipment protection level (EPL) Gb. For further
information, see Annex A.
This standard supplements and modifies the general requirements of IEC 60079-0. Where a
requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of
this standard will take precedence.
This standard applies to electrical equipment, parts of electrical equipment and Ex
components with:
– a rated supply current less than or equal to 16 A;
– a rated supply voltage less than or equal to 1 000 V;
– a rated power consumption less than or equal to 1 000 W.