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Table 21: Constructional Requirements in Europe, USA, Canada and International Comparison, Part 2 Type of ignition protectionAbbreviationRegionInstallation locationStandardEnergy-limited apparatusAEx nCUSClass I, Zone 2ISA 60079-15Ex nLCAClass I, Zone 2CSA E60079-15 Ex nL (EEx nL)EUZone 2EN 60079-15 Ex nLIECZone 2IEC 60079-15Pressurized enclosureType XUSClass I, Division 1FM 3620Type XCAClass I, Division 1NFPA 496 Type YUSClass I, Division 1FM 3620 Type YCAClass I, Division 1NFPA 496 Type ZUSClass I, Division 2FM 3620 Type ZCAClass I, Division 2NFPA 496 AEx pxUSClass I, Zone 1ISA 60079-2 Ex pxCAClass I, Zone 1CSA E60079-2 Ex px (EEx px)EUZone 1EN 60079-2 Ex pxIECZone 1IEC 60079-2 AEx pyUSClass I, Zone 1ISA 60079-2 Ex pyCAClass I, Zone 1CSA E60079-2 Ex py (EEx py)EUZone 1EN 60079-2 Ex pyIECZone 1IEC 60079-2 AEx pzUSClass I, Zone 2ISA 60079-2 Ex pzCAClass I, Zone 2CSA E60079-2 Ex pz (EEx pz)EUZone 2EN 60079-2 Ex pzIECZone 2IEC 60079-2Purged/pressurizedAEx nRUSClass I, Zone 2ISA 60079-15Ex nRCAClass I, Zone 2CSA E60079-15 Ex nR (EEx nR)EUZone 2EN 60079-15 Ex nRIECZone 2IEC 60079-15EncapsulationEx ma (EEx ma)EUZone 0EN 60079-18Ex maIECZone 0IEC 60079-18 AEx mUSClass I, Zone 1ISA 60079-18 Ex mCAClass I, Zone 1CSA E60079-18 Ex mb (EEx mb)EUZone 1EN 60079-18 Ex mbIECZone 1IEC 60079-18Oil immersionAEx oUSClass I, Zone 1ISA 60079-6Ex oCAClass I, Zone 1CSA E79-6 Ex o (EEx o)EUZone 1EN 50015 Ex oIEC Zone 1IEC 60079-6 R.STAHL explosion protection