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I NTRODUCT I ON HAZARDOUS LOCATION DATA

To simplify the marking, the IEC 60079 Standards added “Equipment Protection Levels” (EPL) which includes a “Level of Protection” to identify which Zone the equipment is suitable for. EPL uses “G” for Explosive Gas Atmospheres and “D” for Explosive Dust Atmospheres. There are three Levels of Protection that define the Zone suitability (a, b, c). (Unlike the material classification where “C” is the highest level of protection, with EPL “a” is the highest level of protection). NOTE: IEC 60079 Standards also identify an EPL equipment for use in Explosive Atmospheres in Mines Susceptible to Firedamp as “M”. Mining installations are not included in the NEC or CEC. • EPL Ga — equipment for Explosive gas Atmospheres, having a “very high” level of protection, which is not a source of ignition in normal operation, during expected malfunctions or during rare malfunctions • EPL Gb — equipment for Explosive gas Atmospheres, having a “high” level of protection, which is not a source of ignition in normal operation or during expected malfunctions • EPL Gc — equipment for Explosive gas Atmospheres, having an “enhanced” level of protection, which is not a source of ignition in normal operation, and which may have some additional protection to ensure that it remains inactive as an ignition source in the case of regular expected occurrences (for example failure of a lamp) • EPL Da — equipment for Explosive dust Atmospheres, having a “very high” level of protection, which is not a source of ignition in normal operation, during expected malfunctions, or during rare malfunctions • EPL Db — equipment for Explosive dust Atmospheres, having a “high” level of protection, which is not a source of ignition in normal operation or during expected malfunctions • EPL Dc — equipment for Explosive dust Atmospheres, having an “enhanced” level of protection, which is not a source of ignition in normal operation, and which may have some additional protection to ensure that it remains inactive as an ignition source in the case of regular expected occurrences (for example failure of a lamp)

EPL

ZONE SUITABILITY

Ga Gb Gc Da Db

Zone 0 Zone 1 Zone 2 Zone 20 Zone 21 Zone 22

Dc

Levels of Protection for Ex Equipment To align with the EPL marking system, current IEC 60079 Series Standards have added “Levels of Protection” in addition to each “Type of Protection”. At this time, the addition of this to all IEC 60079 Series Standards may not be complete and products approved to earlier versions of a standard might not be marked with a Level of Protection or EPL. As products evolve and certifications are updated this will be corrected.

Original Marking Ex e

Type of Protection

New Marking Ex eb

Type of Protection Level of Protection

ATEX Zone Equipment Category of Use Unlike the IEC System that identifies the Type and Level of protection to indicate the area in which a product may be installed (e.g., Gb or Db), ATEX uses the term “Category of Use”. There are three Category of Use designations

• 1 = Zone 0 or 20 • 2 = Zone 1 or 21 • 3 = Zone 2 or 22

The Category of Use is prefaced by the same industry/ area designation used in IEC • I = Mines susceptible to fire damp • II = Surface areas where explosive gas may be present • III = Surface areas where explosive dust may be present

EPL G a

Protection Level a – Highest (Zone 0, 20) b – High (Zone 1, 21) c – Enhanced (Zone 2, 22) Material G – Explosive Gas Atmosphere D – Explosive Dust Atmosphere

Equipment Protection Level

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