In areas where the occurrence of an explosive mixture of flammable materials and air cannot be prevented by applying primary explosion protection, special measures for the prevention of ignition sources are to be taken. For example: separation (o, q, m), exclusion (p), special mech. construction (d, e), limitation of energy (ia, ib) or other methods (s). Type of protection:

Ex designation

Temperature Class: Group II electrical operating devided are split into temperature classes according to the maxi- mum surface temperatures at which the Ex-atmosphere can be achieved. Equipment is tempe- rature classified as follows:
T6 IIA to IIC for the ignition protection classes ”personal safety”, ”pressure resistant casing” and ”sand casing” CENELEC marking Type of Gas ignition energy/µJ I methane 280 IIA propane › 180 IIB ethylene 60 … 180 IIC hydrogen ‹ 60 Maximum permitted housing or component temperature of the operating devices T1 T2 T3 T4 T5 T6 450°C 300°C 200°C 135°C 100°C 85°C Explosion groups: The equipment group, amongst other items, appears again in this Designation Section. Group 1 comprises operating devices for coal mining where coal dust and methane atmospheres prevail. Group II applies to the „aboveground“ areas such as chemistry, petrochemistry, mills (dusts) etc. Due to the different minimum ignition energies of the various gases, there is a further division into the categories
IICiaEEx Application in zone 2/22, atmosphere G/D* (*non-conductive dusts)Mark identifying explosion prevention (G) as and (D) ust.For category II, the following classification applies: sufficient safety in cases of failure-free operation Protection against explosions certified in accordance with CENELEC Standard EN 50 and EN 60 Use in hazardous areas:

*

Application in zones 1, 2 or 21, 22, atmosphere G/D / Category 3 normal degree of safety conformity mark: this product complies with applicable standards. *With the introduction of EN 60079-0, the „E“ is within the scope of harmonization with the IEC International Standardization System no longer required for European systems providing protection against explosions. Equipment which are certified according to Directive 94/9/EC (ATEX 95 – replacing: ATEX 100a) regulations carries a special marking. The device group appears first, then the device category and finally the atmosphere reference: sufficient safety in cases of frequent machine errors/ in cases of 1 error (required in accordance with Directive 94/9 EC) Category 1 very high degree of safety Application in zones 0, 1, 2 or 20, 21, 22, atmosphere G/D / Category 2 high degree of safety / Safety is provided by 2 protective measures – even in cases of rarely occurring machine errors or 2 independent machine errors.
II 1 G 6