Explosion Protection Methods

Protection Method Market Ex Code Application Standard Protection Principle
General Requirements US Class I, Division 1 & 2 NEC 500
US AEx Class I, Zone 0, 1 & 2 NEC 505
CA Class I, Division 1 & 2 CSA 22.2 No. 0
CA Ex Class I, Zone 1 & 2 CSA E60079-0
EU Ex Category 1G, 2G, 3G EN 60079-0
IEC Ex EPL Ga, Gb, Gc IEC 60079-0
Zone 0
Intrinsic Safety US AEx ia Class I, Zone 0 NEC 505 Energy Limited
CA Ex ia Class I, Zone 0 CSA E60079-11
EU Ex ia Category 1G EN 60079-11
IEC Ex ia EPL Ga IEC 60070-11
Encapsulation US AEx ma Class I, Zone 0 NEC 505 Keep Flammable Gas out
CA Ex ma Class I, Zone 0 NEC 505
EU Ex ma Category 1G EN 60070-18
IEC Ex ma EPL Ga IEC 60079-18
Zone 1 / Division 1
Intrinsic Safety US (IS) Class I, Division 1 NEC 500/504 Energy Limited
US AEx ib Class I, Zone 1 NEC 505
CA (IS) Class I, Division 1 CSA 22.2 No. 157
CA Ex ib Class I, Zone 1 CSA E60079-11
EU Ex ib Category 2G EN 60079-11
IEC Ex ib EPL Gb IEC 60079-11
Explosion Proof US XP Class I, Division 1 NEC 500 Containment
CA XP Class I, Zone 1 CSA 22.2 No. 30
Flameproof US AEx d Class I, Zone 1 NEC 505
CA Ex d Class I, Zone 1 CSA E60079-1
EU Ex d Category 2G EN 60079-1
IEC Ex d EPL Gb IEC 60079-1
Increased Safety US AEx e Class I, Zone 1 NEC 505 No arcs, sparks or hot surfaces
CA Ex e Class I, Zone 1 CSA E600790-7
EU Ex e Category 2G EN 60079-7
IEC Ex e EPL Gb IEC 60079-7
Pressurization US Type X Class I, Division 1 NFPA 496 Keep flammable gas out
US Type Y Class I, Division 1 NFPA 496
US AEx px Class I, Zone 1 ANSI/ISA 60079-2
US AEx py Class I, Zone 1 ANSI/ISA 60079-2
CA Type X Class I, Zone 1 NFPA 496
CA Type Y Class I, Zone 1 NFPA 496
CA Ex px Class I, Zone 1 CSA E60079-2
CA Ex py Class I, Zone 1 CSA E60079-2
EU Ex px Category 2G EN 60079-2
EU Ex py Category 2G EN 60079-2
IEC Ex px EPL Gb IEC 60079-2
IEC Ex py EPL Gb IEC 60079-2
Encapsulation US AEx mb Class I, Zone 1 NEC 505
CA Ex mb Class I, Zone 1 NEC 505
EU Ex mb Category 2G EN 60070-18
IEC Ex mb EPL Gb IEC 60079-18
Powder Filled US AEx q Class I, Zone 1 NEC 505 Contain the Explosion and Extinguish the Flame
CA Ex q Class I, Zone 1 CSA E60079-5
EU Ex q Category 2G EN 60079-5
IEC Ex q EPL Gb
Zone 2 / Division 2
Intrinsic Safety US AEx ic Division 2 NEC 500/504
CA Ex ic Class I, Zone 2 CEC Section 18
EU Ex ic Category 3G EN 60079-11 Energy Limited
IEC Ex ic EPL Gc IEC 60079-11
Energy Limited CA Ex nL Class I, Zone 2 CSA E60079-15
EU Ex nL Category 3G EN 60079-15
IEC Ex nL EPL Gc IEC 60079-15
Pressurization US Type Z Class I, Division 2 NFPA 496 Keep Flammable Gas out
US AEx pz Class I, Zone 2 ANSI/ISA 60079-2
CA Type Z Class I, Zone 2 ANSI/ISA 60079-2
CA Ex pz Class I, Zone 2 CSA E60079-2
EU Ex pz Category 3G EN 60079-2
IEC Ex pz EPL Gc IEC 60079-2
Encapsulation US AEx mc Class I, Zone 2 NEC 505
CA Ex mc Class I, Zone 2 NEC 505
EU Ex mc Category 3G EN 60070-18
IEC Ex mc EPL Gc IEC 60079-18
Restricted Breathing US AEx nR Class I, Zone 2 NEC 505
CA Ex nR Class I, Zone 2 CSA E60079-15
EU Ex nR Category 3G EN 60079-15
IEC Ex nR EPL Gc IEC 60079-15
Non-Incendive US NI Class I, Division 2 NEC 500 No arcs, sparks or hot surfaces
CA NI Class I, Division 2 C22.2 No. 213
Non-Sparking US AEx nA Class I, Zone 2 ANSI/ISA 60079-15
CA Ex nA Class I, Zone 2 CSA E60079-15
EU Ex nA Category 3G EN 60079-15
IEC Ex nA EPL Gc IEC 60079-15
Enclosed Break US AEx nC Class I, Zone 2 ANSI/ISA 60079-15 Contain the Explosion
CA Ex nC Class I, Zone 2 CSA E60079-15
EU Ex nC Category 3G EN 60079-15
IEC Ex nC EPL Gc IEC 60079-15