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| | | European Union | North America | |
| | Classification of hazards | Explosive mixture in Group I: mines susceptible to firedamp Group II; other areas outside of | Explosive mixtures of air and CLASS I: Gases and vapours CLASS II: Dusts CLASS III; Fibres | |
| | Ignition due to sparks | Grouping of the ignition protection methods ot intrinsic safety/flame proof enclosure, as well as ignition protection method "u", in respect of the minimum ignition current/limit gap and in accordance with the minimum ignition energy of representative gases: Group 1 Methane Group IIA Propane IIB Ethylene IIC Hydrogen. Acetylene | Sub-division of the class according to ignition energy: CLASS I Group A Acetylene B Hydrogen C Ethylene D Methane CLASS II Group E Metal dusts F Coal dusts G Grain dusts CLASS III No grouping | |
| | Ignition hazards due to hot surfaces | Division into temperature classes in accordance with IEC 60079-8 for maximum surface temperatures with an ambient temperature of 40 "C, under fault conditions: T1 < 450 "C T2 < 300 °C T3 < 200 °C T4 <136 °C T5 < 100 "C T6 < 85 °C | |
| | Division of | The following are subdivided according to the probability of the occurrence of a dangerous explosive atmosphere: | |
| | | For gases, vapours, mists: (EN 1127-1) Zone 0 constant or long term Zone 1 occasionally Zone 2 seldom and short term for dusts: (EN 1127-1) Zone 20 constant or long term or frequently 21 occasionally 22 short term or accumulation or layers of dust | Division 1 Division 1 Division 2 | |
| | | Note (see IEC 60079-10): constant or long term corresponds to > 1000 h/year, occasionally corresponds to 10...1000 h/year, seldom or short term corresp. to < 10 h/year | |
| | Safety characteristics | The characteristics of flammable gases and vapours as a basis for classification in respect of ignition energy and temperature/flashpoint are contained in: | |
| | | DIN EN 50014: 1997 appendix A BS 5345. part 1 | NFPA 497 M CSA No. C22-1 | |
| | Approval authorities (named locations in accordance with Directive 94/9/EC) | PTB Physikalisch-Technische Bundesanstalt DMT (old) Deutsche Montan Technologie EXAM (new] BBG PrOf- und Zertifizier- GmbH BASEEFA British Approvals Service for Electrical Equipment in TUV TUV Nord Cert GmbH & Co. KG | UL Underwriters Laboratories, USA FM Factory Mutual Research, USA CSA CanadianStandards | |
| | Installation requirements | EN 60079-14 (VDE 0165. part 1) EN 50281-1-2 (VDE 0165. part 2) for environments with flammable dust and other EC-wide and national (for example ExVo) requirements | NFPA 70 National Electrical Code Art. 500 NFPA 70 National Electrical Code Art. 505 NFPA 493 Standard for Intrinsically safe operations... | |
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