AREA CLASSIFICATION Group II Electrical Apparatus for gas atmospheres G Flammable atmosphere present continously >1000hrs/annum Flammable atmosphere present intermittently >10<1000hrs/annum Flammable atmosphere present abnormally <10hrs/annum Code Standard IEC/CENELEC/EUROPE Gas Dust Zone 0 Zone 20 Zone 1 Zone 21 Zone 2 Zone 22 IEC 60079-10:2002 IEC 61241-3:1997 North America NEC Article 500 (Class I)* A IIC HYDROGEN B IIB ETHYLENE 20 C IIA PROPANE 20 60 D 180 Protection by gas exclusion - analysers Powder filled q 50017 -5 Protection by gas exclusion - weighing machines Flameproof d 50018 -1 Prevention of propagation of internal explosion - dc motors Increased safety e 50019 -7 Prevention by design - induction motors Intrinsic safety ia 50020 -11 Low energy. Safe with two faults - Level measurement INGRESS PROTECTION (IP) CODES (IEC/EN 60529) Intrinsic safety ib 50020 -11 Low energy. Safe with one fault - displays 50039 -25 Considers combinations of intrinsically safe apparatus -27 Technical specification. Will move to Standard status. Zone 2 nL addition will be proposed (see below FNICO) FIRST NUMERICAL SECOND NUMERICAL Encapsulated m 50028 -18 Protection by gas exclusion Protection against solid bodies Protection against liquid Type of protection n n 50021 -15 Prevention by design C O IIA T1 AMMONIA 630 O 600 O IIC T1 HYDROGEN 560 IIA T1 METHANE 537 O NO PROTECTION 0 0 NO PROTECTION OBJECTS GREATER THAN 5Omm 1 1 VERTICALLY DRIPPING WATER OBJECTS GREATER THAN 12mm 2 2 ANGLED DRIPPING WATER -75O TO 90O OBJECTS GREATER THAN 2.5mm 3 3 SPRAYED WATER OBJECTS GREATER THAN 1.0mm 4 4 SPLASHED WATER DUST PROTECTED 5 5 WATER JETS DUST TIGHT 6 T1 450O NEMA, UL & CSA type rating O IIA T2 BUTANE 372 IIC T2 ACETYLENE 305 300 T2 300O 200 T3 200O T4 135O O O IIA T3 KEROSENE 210 O O IIB T4 DIETHYL ETHER 160 O IIC T6 CARBON DISULPHIDE 95 O 100 O T6 85O T5 Electrical Installations -14 -14 New IEC version published 2002 Inspection and maintenance -17 -17 New IEC version published 2002 8 INDEFINITE IMMERSION Repair and overhaul -19 -19 0.2 0.35 T4 CLASSIFICATION <20mm2 Surface temperature <275OC >20mm2<10mm2 Surface temperature <200OC >20mm2 Power dissipation <1.3 W* 0.5 0.7 1 2 5 10 20 O www.mtl-inst.com enquiry@mtl-inst.com *Reduced to 1.2 W with 60 C ambient or 1.0 W with 80 C ambient The MTL Instruments Group plc Power Court, Luton, Bedfordshire, England LU1 3LU T. +44 (0) 1582 723633 F. +44 (0) 1582 422283 CENELEC EN Code Abbreviated protection description IEC 61241 IEC MARKING SUB DIVISIONS OF TYPE n R R Restricted breathing enclosures L L Energy limited apparatus P Z Simplified pressurised enclosure C C Otherwise protected sparking apparatus A A Non-sparking apparatus REMARKS Enclosure protected - construction and testing Enclosure protected - selection, installation and maintenance Electrical apparatus for dusts - 50281-2-1 -2-1 : 1994 Method for determining minimum ignition temperatures for dust Electrical apparatus for dusts - 50281-3 -3 : 1997 Classification of areas where combustible dusts present Electrical apparatus for dusts pD -4 : 2001 Type of protection pD - pressurised - Basic concepts & methodology for all industries except mining Basic concepts & methodology for mining Passive components JB Well defined sources of stored energy considered in safety analysis -1-2 : 1999 Sources of generated energy not more than *1.5V, 100mA & 25mW NOT piezoelectric crystal protected components voltage or current enhancement 5Vin Note: IEC are currently working on a programme to introduce a parallel series of standards for combustible dusts reflecting the IEC 60079 - gas atmosphere standards. 3R IP24 Outdoor, from rain, sleet & ice damage 4 IP66 Indoor & outdoor, from windblown dust, rain, splashing & hose directed water & ice damage 61241-0 Indoor & outdoor, from corrosion, windblown dust, rain, splashing & hose directed water & ice damage 61241-1 Protection by enclosure tD 61241-2 Type of protection pD - pressuriastion pD 61241-10 Area classification - 61241-11 Intrinsically safe apparatus iD 61241-14 Selection and installation for electrical apparatus for dusts - 61241-17 Inspection and maintenance requirements - 61241-18 Apparatus protected by encapsulation 61241-20-1 Test methods for dust other parts will also be generated They have agreed to re-number the parts as shown below. It is anticipated that a number of these will be published by the end of 2003 Indoor & outdoor, from hose directed water, water entry during sub-mersion & ice damage Indoor, from dust, spraying water, oil & non-corrosive liquids 3 -1-1 : 1999 Outdoor, from rain, sleet windblown dust & ice damage IP54 22 50281-1-2 IP55 13 2 Part 2 - 50281-1-1 3 Indoor, from dust, falling dirt & dripping non-corrosive liquids 21 EN 1127-2 - Indoor, limited, falling dirt &water IP54 1 Explosion prevention & protection - IP22 12 20 Part 1 - Electrical apparatus for dusts 2 IP67 CENELEC MARKING EN 1127-1 Electrical apparatus for dusts Indoor, from contact with contents 6 Associated apparatus* *Located in non-hazardous area and may be connected to hazardous area ** Hazardous-area apparatus Explosion prevention & protection REMARKS IK10 IP20 IP66 Explosion protected Simple Apparatus Permitted Zone ATEX category 1 4X at 40OC ambient O -20 Group II Electrical Apparatus for combustible dusts D Approximate IEC/IP classification 100O SMALL COMPONENT RELAXATION SURFACE AREA New IEC version published 2002 EFFECTS OF IMMERSION O IIA T3 CYCLOHEXANE 259 -10 HEAVY SEAS US ENCLOSURE RATINGS 400 O -10 6 NEMA 7 TO 10 HAZARDOUS AREA ENCLOSURES O REMARKS Classification of hazardous areas Degrees of protection provided by enclosures for electrical equipment against mechanical impacts 500 IIB T2 ETHYLENE 425 0.14 IEC 60079 7 IK00 IK01 IK02 IK03 IK04 IK05 IK06 IK07 IK08 IK09 * Protection concept (IS) CEN CENELEC EN 60079 T 4 Explosion Protection - Europe - Selection, installation, inspection, maintenance Data for flammable gases IK code O IIA T1 PROPANE 470 Codes of Practice for gas atmospheres Mechanical Impacts (IK) Code EN50102 O O Fieldbus Intrinsically safe concept FISCO II C Certified to the CENELEC standard Protection by gas exclusion - transformers Impact energy (Joules) O 700 Basic electrical requirements Intrinsically safe systems ] Temperature classification** Permits combined methods of protection -2 Equipment is dust-tight and protected against water jets. IGNITION TEMPERATURE/ TEMPERATE CLASS (T CLASS) -0 -6 EXAMPLE IP65 *North America hazard categories: Class I (Gasses & Vapours); Class II (Dusts); Class III (Fibres) 50014 EW IIC ACETYLENE 50284 General requirements 50016 Listed in NEC® Article 505-5 Listed in NEC® Article 500-3(c) i a Apparatus group (gas group) 50015 Zone 2 Division 2 E x 3 p Zone 1 Minimum ignition energy (microjoules) 2 2 Category 1G N IEC 60079-0 CENELEC EN50014 1 1 o Division 1 Typical gas hazard 0 Pressurised Zone 0 GAS GROUPING IEC 60079 [E REMARKS Oil immersion NORTH AMERICA NEC 505 Gas NEC 500 Gas & Dust CENELEC EN TITLE IEC PROPOSED STANDARD NUMBER General requirements for electrical apparatus for use in presence of combustible dusts Australia France Italy Netherlands USA T. +61 (0)8 9455 2994 F. +61 (0)8 9455 2805 T. +33 (0)4 78 64 98 32 F. +33 (0)4 78 35 79 41 T. +39 (0)2 61802011 F. +39 (0)2 61294560 T. +31 (0)48 1450250 F. +31 (0)48 1450260 T. +1 800 835 7075 F. +1 603 926 1899 Canada Germany Japan Singapore T. +1 905 840 7850 F. +1 905 840 7852 T. +49 (0)2131 718930 F. +49 (0)2131 7189333 T. +81 (0)3 5420 1281 F. +81 (0)3 5420 2405 T. +65 6 487 7887 F. +65 6 487 7997 China India Middle East UK T. +86 010 8562 5718 F. +86 010 8562 5725 T. +91 (0)44 24501660 F. +91 (0)44 24501436 T. +971 2 63 22399 F. +971 2 63 22566 T. +44 (0)1582 407298 F. +44 (0)1582 407222 PROPOSED STATUS CODE - WORK IN PROGRESS Guideline figures Certification Code Permitted Zone ATEX category } IEC STANDARD NUMBER Fieldbus in hazardous areas The Fieldbus Intrinsically safe Concept (FISCO) IEC60079-27 Technical Enclosure protected, temperature limitation - construction and testing Specification will move to Standard 61241-4 Type of protection pD status in the near future. The benefits 61241-3 Area classification from FISCO will be extended to include - similar levels of flexibility in Zone 2 and Selection, installation and maintenance of apparatus meeting IEC61241-1-1 above Division 2. Further details are contained - and AN9027 FNICO (Fieldbus Non- 61241-1-2 mD - TITLE 61241-1-1 - } *Note: North America still uses 1.2V and 20 microjoules 61241-2-1 Methods for determining minimum ignition temperatures of dust For technical advice or further information call: +44 (0) 1582 723633 in MTL Application Notes AN9026 FISCO Incendive Concept) International (IEC) standards www.iec.ch European (CENELEC) standards www.cenelec.org National Electrical Codes (NEC®) www.nfpa.org/catalog/home/index.asp 20Vout