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15 The requirements on types of protection for areaswhere combustible dust may occur are specified in the standard series IEC 61241. In Europe, these standards replace the existing series EN 50281.Since many requirements are identical to the stan-dards for explosive gas atmospheres, both stan- dard series will be summarized in the series IEC or EN 60079 (tables 7 and 8).

Table 7: Electrical Apparatus for Explosive Gas Atmospheres EN (old)EN (new)IECGeneral requirementsEN 50 014EN 60079-0IEC 60079-0Flameproof enclosures “d”EN 50 018EN 60079-1IEC 60079-1 Pressurized enclosures “p”EN 50 016EN 60079-2IEC 60079-2 Powder filling “q”EN 50 017EN 60079-5IEC 60079-5 Oil immersion “o”EN 50 015EN 60079-6IEC 60079-6 Increased safety “e"EN 50 019EN 60079-7IEC 60079-7 Intrinsic safety “i”EN 50 020EN 60079-11IEC 60079-11 Type of protection “n”EN 50 021EN 60079-15IEC 60079-15 Encapsulation “m”EN 50 028EN 60079-18IEC 60079-18 Intrinsically safe systemsEN 60079-25IEC 60079-25 Electrical equipment for Zone 0EN 50 284EN 60079-26IEC 60079-26 Intrinsically safe field bus systemsEN 60079-27IEC 60079-27 Optical radiation “op”EN 60079-28IEC 60079-28 Table 8: Electrical Apparatus for Use in the Presence of Combustible Dust EN (old)EN (new)IEC (new)IEC (old)General requirementsEN 61241-0IEC 61241-0IEC 61241-1-1Protected by enclosures “tD”EN 50281-1-1EN 61241-1IEC 61241-1IEC 61241-1-1 Pressurized enclosures “pD”EN 61241-2EN 61241-2EN 61241-4 Intrinsic safety “iD”EN 61241-11IEC 61241-11EN 61241-5 Encapsulation “mD”EN 61241-18IEC 61241-18 R.STAHL explosion protection