100 mm

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 100 °C > 100 °C < 135 °C230 °C T2C T6 85 °C > 85 °C < 100 °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 °C100 °CT4AT5AmmoniaPropane *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, commandand 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 immersionPowder 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