
Flameproof
Flameproof ‘‘d’’ equipment protection techniques involve enclosures so designed to withstand
the internal ignition of flammable or combustible air mixtures without sustaining damage or
allowing the propagation of the flames, burning gases, or debris through enclosure seams,
TABLE 9.12 IEC combustible dust and fibers equipment protection techniques [39–41]
Protection
technique/
Marking
Suitable hazardous
(classified) area locations Standard No. Title
General Requirements
Ex Zone 20, 21, or 22 IEC 61241-0 Electrical Apparatus for Use in the Presence of
Combustible Dust – Part 0: General
Requirements
Ex ELP Ga, Gb, or Gc IEC 60079-0 Explosive Atmospheres ...