Electical heat in hazardous areas
1Pages

Conditions in explosive areas Flammable material Temporary behaviour of the flammable material in Ex zones Classification of explosive areas Required marking of suitable electrical equipment per CENELEC CENELEC/ IEC US NEC 505 US NEC 500 Equipment group Equipment category Gases, vapours Are present permanently, extended time or often Zone 0 Class I Zone 0 Class I Division 1 II 1G Are likely to occur Zone 1 Class I Zone 1 II 2G or 1G Occur only rarely or for a short time Zone 2 Class I Zone 2 Class I Division 2 II 3G or 2G or 1G Methane – – Mining Mining – – Mining – I I M1 M2 or M1 Protection methods Protection method Symbol Marking Protection concept Zone CENELEC IEC FM/UL Application General requirements – all all all EN IEC 60079-0 FM 3600/UL 2279 All applications Flameproof enclosure Ex d AEx d External transmission of an explosion is prevented 1 or 2 1 or 2 – EN IEC 60079-1 FM 3615/UL 2279 Switchgear, control units, motors command and signaling devices, power electronics Increased safety Ex e AEx e Avoidance of sparks and temperatures 1 or 2 1 or 2 Class I, Zone 1 EN IEC 60079-7 FM 3600/UL 2279 Installation boxes, enclosures, motors, lights, terminals Intrinsic safety Ex i (IS) Energy limitation of sparks and temperatures 0, 1 or 2*** 0, 1 or 2*** Class I, Div. 1 EN IEC 60079-11 FM 3610/UL 2279 Measuring, control technology and engineering, sensors, actuators, instrumentation Pressurized Ex p Ex atmosphere is kept apart from ignition source 1 or 2 1 or 2 Class I, Div. 1/2 EN IEC 60079-2 FM 3620/NFPA 496 Switchgear and control cabinets, motors, measuring and analysis devices, calculators Encapsulation Ex m AEx m Ex atmosphere is kept apart from ignition source 1 or 2 1 or 2 Class I, Zone 1 EN IEC 60079-18 FM 3600/UL 2279 Coils of relays and motors, electronics, magnetic valves, connecting systems Oil immersion Ex o AEx o Ex atmosphere is kept apart from ignition source 1 or 2 1 or 2 Class I, Zone 1 EN IEC 60079-6 FM 3600/UL 2279 Transformers, relays, start-up control units, switchgear Sand encapsulation Ex q AEx q External transmission of an explosion is prevented 1 or 2 1 or 2 Class I, Zone 1 EN IEC 60079-5 FM 3600/UL 2279 Transformers, relays, capacitors Protection method »n« Ex n AEx n Different protection concepts for zone 2 2 2 Class I, Zone 1 EN IEC 60079-15 FM 3600 Only applications zone 2 Nonincendive (IN) Avoidance of sparks and temperatures – – Class I, Div. 1 – – FM 3611/UL 1604 Explosionproof (XP) External transmission of an explosion is prevented – – Class I, Div. 1 FM 3615/UL 1203 Optical radiation AEx op Ex op Limit, avoid etc. transmission of optical radiation 1 or 2 1 or 2 – EN IEC 60079-28 Optoelectronic devices, e.g. with fibreoptics Ex… Optional e, d, m, b 1 or 2 EN/EC 60079-30-1 Electrical heat tracing and accessories Additional conditions Conditions Marking Equipment applicable without restriction - Observe special application conditions x Ex device with system certificate cannot be used alone; CE conformity will be certified through assembly of complete equipment u Permissive surface temperature Group II T1 = 450 T2 = 300 T3 = 200 T4 = 135 T5 = 100 T6 = 85 T1 = 450 T2 = 300 T2A = 280 T2B = 260 T2C = 230 T2D = 215 T3 = 200 T3A = 180 T3B = 165 T3C = 160 T4 = 135 T4A = 120 T5 = 100 T6 = 85 EU °C USA Electrical equipment marking for gas-explosive areas Electrical equipment marking for dust-explosive areas Conditions in explosive areas Flammable material Temporary behaviour of the flammable material in Ex zones Classification of explosive areas Required marking of suitable electrical equipment per CENELEC CENELEC/ IEC US NEC 505 US NEC 500 Equipment group Equipment category Dusts Are present permanently, extended time or often Zone 20 – Class II Division 1 II 1D Are likely to occur Zone 21 – II 2D or 1D Are unlikely to occur through whirled dust, if they do though only rarely or only for a short time Zone 22 – Class II Division 2 II 3D or 2D or 1D Dust – – Mining Mining – – Mining – I I M1 M2 or M1 Maximum allowed surface temperature eltherm GmbH · Ernst-Heinkel-Str. 6 – 10 · 57299 Burbach/Germany · Tel.: +49(0)2736/4413 - 0 · Fax: +49(0)2736/4413 - 50 · E-Mail: info@eltherm.com · www.eltherm.com IBExU 09 ATEX 1047X II 2G Ex e II T6 0637 IBExU 09 ATEX 1047X II 2D Ex tD A21 IP65 T85°C 0637 Protection methods Protection method Symbol Marking Protection concept Testing method Zone CENELEC IEC FM/UL Application General requirements – – all Class II, Div 1/2 EN IEC 61241-0 UL 1604 All applications Protection by enclosure tD Ex atmosphere is kept apart from ignition source and temperature limitation A: B: 20, 21 or 22 20 or 21 Class II, Div 1 EN IEC 61241-1 UL 1203 Switching, command and signaling devices, lights, installation boxes, enclosures Pressurized pD Ex atmosphere is kept apart from ignition source – 21 or 22 21 or 22 Class II, Div 1/2 EN IEC 61241-4 NFPA 496 Switchgear and control cabinets, motors, measuring and analysis devices, calculators Intrinsic safety iD Energy limitation of sparks and temperatures – 20, 21 or 22 20, 21 or 22 Class II, Div 1 EN IEC 61241-11 FM 3610/UL 913 Measuring, control technology and engineering, sensors, actuators, instrumentation Encapsulation mD Ex atmosphere is kept apart from ignition source – 20, 21 or 22 20, 21 or 22 – EN IEC 61241-18 – Coils of relays and motors, electronics, magnetic valves, connecting systems Quality control (examples) Notified body Country Code No. TÜV Hannover/ Sachsen-Anhalt e.V. Germany 0032 PTB Germany 0102 DQS Germany 0297 IBExU Germany 0637 LCIE France 0081 KEMA Netherlands 0344 Demko Denmark 0539 Nemko Norway 0470 Sira Great Britain 0518 EECS (BASEEFA) Great Britain 0600 CENELEC/ IEC/NEC 505 NEC 500 Classes and groups according to NEC 500: Typical gases Class I Acetylene/group A Hydrogen/group B Ethylene/group C Propane/group D Mining Methane Ex zones according to NEC 500 Division 1 Permanent or incidental danger Division 2 rare or temporary danger Classes and groups according to NEC 500: typical dusts, fluffs, fibres Class II Metal dust/group E Coal dust/group F Grain dust/group G Class III Fibres/fluffs Explosion Protection – An Overview IP 2. digit Protection from moisture 0 Non protected 1 Protected against vertically dripping water 2 Protected against dripping water when tilted up to 15° 3 Protected against spraying water 4 Protected against splashing water (360°) 5 Protected against jetting water (360°) 6 Protected against powerfully jetting water (360°) 7 Protected against the temporary effects of immersion 8 Protected against continuous submersion IP (Ingress Protection) Code Symbols IP 1. digit Contact Protection from foreign bodys 0 Non protected Non protected 1 With large surface body parts (back of the hand) Protected against solid objects, diameter > 50 mm 2 With fingers Protected against solid objects, diameter > 12 mm 3 With tools and wires, diameter > 2,5 mm Protected against solid objects, diameter > 2,5 mm 4 With tools and wires, diameter > 1 mm Protected against solid objects, diameter > 1 mm 5 Total protection Dust protected 6 Total protection Dust tight Example: IP 21 First digit means Protection against contact with fingers and foreign bodies, which are bigger than 12 mm in diameter. Second digit means The device is protected against vertically falling water drops. Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 360° 2 1 Für Druckfehler wird keine Haftung übernommen Ø > 50 Ø > 12 Ø > 2,5 Ø > 1 15° 60° 360° 360° 2 1 2 1 Classification according to CENELEC/IEC/NEC 505, Explosion sub-group gases and vapours T1 T2 T3 T4 T5 T6 I Methane – – – – – II A Ammonia Methane Ethane Propane Ethyl alcohol Cyclohexane n-Buthane n-Hexane Fuel in general Aircraft fuel Fuel oil Acetaldehyde – – II B (incl. II A) Acrylnitrile Ethylene Ethylene oxide Ethylene glycol Hydrogen sulphide Ethyl ether – – II C (incl. II B) Hydrogen Ethine (Acetylene) – – – Coal disulphide Notifying body Notifying body Year Year Ex-mark Ex-mark According to Directive 94/9/EG According to Directive 94/9/EG