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ELECTRO-TECHNOLOGY FOR INDUSTRYTemperature classes and highest permissible surface temperatures of the equipmentHighest permissiblesurfacetemperatureUSA(NEC 500)Usability of the equipmentT6T5T4T3TIP: This double page can be ordered free of charge from Pfannenberg as a poster (A2). Article number: 075000018T2T1Temperature classes accordingto CENELEC/IEC NEC 505Max. surface temperature of theequipmentT1 450 °C > 450 °CIgnition temperature of thecombustible substances450 °C T1 T2 300 °C > 300 °C < 450 °C300 °C T2 T3 200 °C > 200 °C < 300 °C280 °C T2A T4 135 °C > 135 °C < 200 °C260 °C T2B T5 <strong>100</strong> °C > <strong>100</strong> °C < 135 °C230 °C T2C T6 85 °C > 85 °C < <strong>100</strong> °C215 °C T2D200 °C180 °CT3T3AClassification of gases and vapours into explosion groups and temperature classesClassification into temperature classes / gas groups (extract)165 °C T3BT1 T2 T3 T4 T5 T6160 °C T3CI Methane – – – – –135 °C T4IIA Acetone Ethyl alcohol Petrols Acetaldehyde –Acetic acid n-butane Heating oil Ethyl ether–120 °C<strong>100</strong> °CT4AT5A<strong>mm</strong>oniaPropane *n-butyl alcohol Diesel85 °C T6IIB Town gas Ethylene * – –IIC Hydrogen * Acetylene * – – Carbon bisulphide* typical ignitable gasProtective systemsProtective system Marking Protection principle Zone IEC EN VDE FM / UL Applicationsgeneral requirements – – – 60079-0 60079-0VDE 0171part 1all applicationsfl ame proof enclosure Ex dtransmission of an explosionto the outside is excluded1 or 2 60079-1 60079-1VDE 0171part 5FM 3600UL 2279switchgear, controllers, motors, co<strong>mm</strong>andand alarm devices, power electronicsenhanced safetyEx eavoidance of sparks and hightemperatures1 or 2 60079-7 60079-7VDE 0171part 6FM 3600UL 2279junction and terminal boxes, enclosures,motors, beacons, terminalsintrinsically safetypressurizedenclosureEx iEx plimitation of the energy ofsparks and temperaturesEx atmosphere is kept awayfrom the source of ignition0, 1or 2 3 60079-11 60079-111 or 2 60079-2 60079-2VDE 0171part 7, part 8VDE 0171part 3FM 3610UL 2279FM 3620NFPA 496measurement, control and regulatingequipment, sensors, actuators,instrumentationpower and control cabinets, motors,measurement and analysis devices,computersEncapsulationoil i<strong>mm</strong>ersionPowder fi llingEx mEx oEx qEx atmosphere is kept awayfrom the source of ignitionEx atmosphere is kept awayfrom the source of ignitiontransmission of an explosionto the outside is excluded1 or 2 60079-18 60079-181 or 2 60079-6 60079-61 or 2 60079-5 60079-5VDE 0171part 9VDE 0171part 6VDE 0171part 4FM 3600UL 2279FM 3600UL 2279FM 3600UL 2279relay and motor coils, circuitry, solenoidvalves, connecting systemstransformers, relays, start-up controllers,switching devicestransformers, relays, capacitorsTechnologyvarious protection principlestype ‘n’ protection Ex n 4 for Zone 2Ex atmosphere is kept awayprotective enclosure IPfrom the source of ignition1devices, 2 systems3ia use in Zones 0, 1, 2 / ib use in Zones 1, 2Group A, B, C, D2 60079-15 60079-150/21/22 61241-1 61241-1AEx de IIC T6Ex de IIC T6Ex de IIC T6 PTB 01 ATEX 1234 XT6VDE 0170/-0171 part 1VDE 0171part 1Additional conditionsConditionsEquipment usable without restriction –Observe special conditions for useall applications for Zone 2all applications4nA = non-sparking, nC = sparking equipment (suitable protection), nR = vapour-proof enclosure,nL = energy-limited (differences between North America and Europe), nP = simplifi ed overpressure encapsulationEx component with partial certifi cation, not capableof operation alone; CE conformity is only certifi edafter installation in complete equipmentXMarking193