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 flling “q”，intended for use in explosive gas atmospheres.
NOTE 1 Electrical equipment and Ex components protected by powder flling “q” can contain electronic circuits,transformers，protection fuses, relays。 intrinsically safe electrical apparatus, associated electrical apparatus,switches, etc.
NOTE 2 Type of protection powder flling“q” provides Equipment Protection Level (EPL) Gb or Mb.
