SIST EN 13463-1:2009
(Main)Non-electrical equipment for use in potentially explosive atmospheres - Part 1: Basic method and requirements
Non-electrical equipment for use in potentially explosive atmospheres - Part 1: Basic method and requirements
This European Standard specifies the basic method and requirements for design, construction, testing and marking of non-electrical equipment intended for use in potentially explosive atmospheres in air of gas, vapour, mist and dusts. Such atmospheres can also exist inside the equipment. In addition the external atmosphere can be drawn inside the equipment by natural breathing produced as a result of fluctuations in the equipment’s internal operating pressure, and/or temperature.
This European Standard is valid for atmospheres having pressures ranging from 0,8 bar to 1,1 bar and temperatures ranging from - 20 °C to + 60 °C., i.e. equipment built to this European Standard will be satisfactory to any service conditions within this range unless otherwise specified.
NOTE 1 The requirements of this European Standard can also be helpful for the design, construction, testing and marking of equipment intended for use in atmospheres outside the validity range stated above, but in this case, the ignition hazard assessment, ignition protection provided, additional testing (if necessary), manufacturer’s technical documentation and instructions to the user, should clearly demonstrate and indicate the equipment’s suitability for the conditions it may encounter. It should be recognized that changes in temperature and pressure can have a significant influence on ignitability.
This European Standard does not cover additional marking for equipment intended for use outside the scope of its validity such as an oxygen enriched atmosphere.
This European Standard is also applicable for the design, construction, testing and marking of components, protective systems, devices and assemblies of these products which have possible ignition sources and are intended for use in potentially explosive atmospheres.
It specifies the requirements for the design and construction of equipment, intended for use in potentially explosive atmospheres in conformity with all categories of Group I and II. T
Nicht-elektrische Geräte für den Einsatz in explosionsgefährdeten Bereichen - Teil 1: Grundlagen und Anforderungen
Diese Europäische Norm legt die grundsätzlichen Anforderungen an Konstruktion, Bau, Prüfung und Kennzeichnung
von nicht-elektrischen Geräten fest, die für den Einsatz in durch Gase, Dämpfe, Nebel oder Stäube
gebildeten explosionsgefährdeten Bereichen in Luft bestimmt sind. Derartige atmosphärische Bedingungen
können auch im Inneren der Geräte herrschen. Als Folge der Schwankungen von Innenbetriebsdruck
und/oder -temperatur der Geräte kann darüber hinaus die Außenatmosphäre durch natürliche Lüftung in das
Geräteinnere gelangen.
Diese Europäische Norm gilt für Atmosphären mit Drücken von 0,8 bar bis 1,1 bar und Temperaturen von
–20 °C bis +60 °C, d. h., nach der vorliegenden Norm gebaute Geräte werden unter allen Einsatzbedingungen
innerhalb dieses Druck- und Temperaturbereichs alle Anforderungen erfüllen, sofern nichts anders festgelegt
ist.
ANMERKUNG 1 Die Anforderungen der vorliegenden Norm können auch bei Konstruktion, Bau, Prüfung und Kennzeichnung
von Geräten von Nutzen sein, die für den Einsatz in Atmosphären bestimmt sind, die nicht in den
Gültigkeitsbereich dieser Norm fallen, jedoch sollten in diesem Fall die Zündgefahrenbewertung, die vorgesehene
Zündschutzart, zusätzliche Prüfungen (falls erforderlich), die technische Dokumentation des Herstellers und die
Bedienungsanleitung die Eignung der Geräte für die möglichen Einsatzbedingungen eindeutig darstellen und nachweisen.
Unbedingt sollte bedacht werden, dass Temperatur- und Druckänderungen einen wesentlichen Einfluss auf die
Zündfähigkeit haben können.
Diese Europäische Norm umfasst nicht die zusätzliche Kennzeichnung von Geräten, die für den Einsatz
außerhalb des Geltungsbereiches vorgesehen sind, z. B. in mit Sauerstoff angereicherter Atmosphäre.
Appareils non électriques destinés à être utilisés en atmosphères explosibles - Partie 1: Prescriptions et méthodologie
La présente Norme européenne définit la méthode et les prescriptions de base pour la conception, la construction, les essais et le marquage des appareils non électriques destinés à être utilisés en atmosphères explosibles sous forme de gaz, vapeurs, brouillards et poussières. Ces atmosphères peuvent également exister à l’intérieur de l’appareil. En outre, l'atmosphère externe peut être aspirée à l'intérieur de l'appareil par la respiration naturelle produite en raison des variations de pression de service internes à l'appareil et/ou de la température.
La présente Norme européenne est valable pour les atmosphères avec des pressions allant de 0,8 bar à 1,1 bar et des températures allant de – 20 °C à + 60 °C, c'est-à-dire que les appareils fabriqués conformément à la présente Norme européenne seront satisfaisants dans n'importe quelle condition de service dans cette plage, sauf spécification contraire.
NOTE 1 Les prescriptions de la présente Norme européenne peuvent également s’avérer utiles pour la conception, la construction, les essais et le marquage des appareils destinés à être utilisés dans des atmosphères n’entrant pas dans la plage indiquée ci-dessus, mais, dans ce cas, il convient que l'évaluation du risque d’inflammation, la protection prévue à cet effet, les essais supplémentaires (si nécessaire), la documentation technique du fabricant et les instructions destinées à l’utilisateur démontrent et indiquent clairement que l’appareil est adapté aux conditions qu’il peut rencontrer. Il convient de reconnaître que les variations de température et de pression peuvent avoir une influence significative sur l'inflammabilité.
La présente Norme européenne ne traite pas du marquage supplémentaire des appareils destinés à être utilisés hors du domaine d'application prévu, tel qu'une atmosphère enrichie en oxygène.
Neelektrična oprema za potencialno eksplozivne atmosfere - 1. del: Osnovne metode in zahteve
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Nicht-elektrische Geräte für den Einsatz in explosionsgefährdeten Bereichen - Teil 1: Grundlagen und AnforderungenAppareils non électriques destinés à être utilisés en atmosphères explosibles - Partie 1: Prescriptions et méthodologieNon-electrical equipment for use in potentially explosive atmospheres - Part 1: Basic method and requirements13.230Varstvo pred eksplozijoExplosion protectionICS:Ta slovenski standard je istoveten z:EN 13463-1:2009SIST EN 13463-1:2009en,fr,de01-maj-2009SIST EN 13463-1:2009SLOVENSKI
STANDARDSIST EN 13463-1:2002/AC:2002SIST EN 13463-1:20021DGRPHãþD
SIST EN 13463-1:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13463-1January 2009ICS 13.230Supersedes EN 13463-1:2001
English VersionNon-electrical equipment for use in potentially explosiveatmospheres - Part 1: Basic method and requirementsAppareils non électriques destinés à être utilisés enatmosphères explosibles - Partie 1: Prescriptions etméthodologieNicht-elektrische Geräte für den Einsatz inexplosionsgefährdeten Bereichen - Teil 1: Grundlagen undAnforderungenThis European Standard was approved by CEN on 29 November 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13463-1:2009: ESIST EN 13463-1:2009
EN 13463-1:2009 (E) 2 Contents Page Foreword .4Introduction .51Scope .62Normative references .73Terms and definitions .74Equipment categories and explosion groups . 115Ignition hazard assessment . 136Assessment of possible ignition sources . 167Additional considerations . 268Verification and tests . 289Documentation and information for use . 35Annex A (normative)
Methodology for confirming the category . 40Annex B (informative)
Explanation of the ignition hazard assessment procedure . 42Annex C (informative)
Examples of ignition hazard assessment . 47Annex D (informative)
Charging tests with non conductive materials . 59Annex E (informative)
Example of rig for resistance to impact test . 64Annex F (normative)
Rig for impact ignition test . 65Annex G (informative)
Consideration of misuse which can reasonably be anticipated during ignition hazard assessment procedure . 66Annex H (informative)
Significant changes between this European Standard and the previous edition . 68Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC . 70Bibliography . 72Figures Figure 1 — Relationship between ignition source definitions . 10 Figure D.1 — Rubbing with a pure polyamide cloth . 62 Figure D.2 — Discharging the charged surface of the test piece with a probe connected to earth via a 0,1 µF capacitor . 62 Figure D.3 — Charging by the influence of a DC high voltage power . 63 Figure E.1 — Example of rig for resistance to impact test . 64 Figure F.1 — Rig for impact ignition test . 65 Tables Table 1 — Equipment explosion groups . 12 Table 2 — Explosion groups for equipment incorporating flame arresters (subdivisions) . 13 Table 3 — Classification of maximum surface temperatures for Group IIG equipment . 18 SIST EN 13463-1:2009
EN 13463-1:2009 (E) 3 Table 4 — Assessment for T4 classification according to component size . 18 Table 5 — Single impact energy limits for category 1G equipment . 21 Table 6 — Single impact energy limits for category 2G equipment . 21 Table 7 — Single impact energy limits for category 3G equipment . 21 Table 8 — Single impact energy limits for categories 1D, 2D and 3D equipment . 22 Table 9 — Permitted maximum projected areas for non-conductive parts of equipment liable to become electrostatically charged . 25 Table 10 — Tests of resistance to impact . 30 Table 11 — Ambient temperature marking . 37 Table B.1 —Table showing recommended documentation of initial assessment of equipment related ignition sources . 43 Table B.2 — Example for reporting of the identification of ignition hazards (step 1) and the first assessment (step 2) . 44 Table B.3 — Example for reporting of the determination of preventive or protective measures (step 3) and the concluding estimation and categorisation (step 4) . 45 Table C.1 — Common cases demonstrating the use of the scheme – Electrostatic discharge . 48 Table C.2 — Common cases demonstrating the use of the scheme – Hot surface . 49 Table C.3 — Common cases demonstrating the use of the scheme – Mechanical spark . 50 Table C.4 — Ignition hazard assessment report for a pump . 52 Table C.5 — Ignition hazard assessment report for an agitator . 55 Table H.1 — Significant changes . 68 Table ZA.1 — Correspondence between this European Standard and Directive 94/9/EC . 70
SIST EN 13463-1:2009
EN 13463-1:2009 (E) 4 Foreword This document (EN 13463-1:2009) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres - Explosion prevention and protection”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2009, and conflicting national standards shall be withdrawn at the latest by July 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 13463-1:2001. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Directive(s). For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document. Annex H provides details of significant technical changes between this European Standard and the previous edition: EN 13463-1:2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 13463-1:2009
EN 13463-1:2009 (E) 5
Introduction Non-electrical equipment in accordance with this European Standard means mainly mechanical equipment. The extent of explosion protection and prevention measures applied to mechanical equipment differ from those applied to electrical equipment. Whereas common electrical equipment working within its design parameters often contains effective ignition sources, this is not true for most mechanical equipment. In most cases, the normal operation of mechanical equipment within its design parameters will not lead to ignition of an explosive atmosphere. In other words, most mechanical equipment performing its designed duty without malfunctions and with proper maintenance will not produce ignition sources in normal operation. Thus, additional protective measures that are commonly used for electrical explosion protected equipment (e.g. enclosures) are not needed. Even where malfunctions have to be considered, much mechanical equipment can meet the requirements for category 2 equipment by a proper choice of well-tried constructional measures that would reduce failures causing ignition sources to an acceptably low level.
Essential to this decision is the use of the ignition hazard assessment to evaluate the potential ignition sources of mechanical equipment and under which conditions they will become effective. This is the fundamental difference to standards for electrical equipment. SIST EN 13463-1:2009
EN 13463-1:2009 (E) 6 1 Scope This European Standard specifies the basic method and requirements for design, construction, testing and marking of non-electrical equipment intended for use in potentially explosive atmospheres in air of gas, vapour, mist and dusts. Such atmospheres can also exist inside the equipment. In addition, the external atmosphere can be drawn inside the equipment by natural breathing produced as a result of fluctuations in the equipment’s internal operating pressure, and/or temperature. This European Standard is valid for atmospheres having pressures ranging from 0,8 bar to 1,1 bar and temperatures ranging from - 20 °C to + 60 °C., i.e. equipment built to this European Standard will be satisfactory to any service conditions within this range unless otherwise specified. NOTE 1 The requirements of this European Standard can also be helpful for the design, construction, testing and marking of equipment intended for use in atmospheres outside the validity range stated above. In this case however, the ignition hazard assessment, ignition protection provided, additional testing (if necessary), manufacturer’s technical documentation and instructions to the user, should clearly demonstrate and indicate the equipment’s suitability for the conditions it may encounter. It should also be recognized that changes in temperature and pressure can have a significant influence on ignitability. This European Standard does not cover additional marking for equipment intended for use outside the scope of its validity such as an oxygen-enriched atmosphere. This European Standard is also applicable for the design, construction, testing and marking of components, protective systems, devices and assemblies of these products which have possible ignition sources and are intended for use in potentially explosive atmospheres. It specifies the requirements for the design and construction of equipment, intended for use in potentially explosive atmospheres in conformity with all categories of Group I and II. This European Standard can be supplemented by European Standards concerning the specific types of ignition protection. NOTE 2 These are given below: EN 13463-2, Non-electrical equipment for use in potentially explosive atmospheres – Protection by flow restricting enclosure (fr) EN 13463-3, Non-electrical equipment for use in potentially explosive atmospheres – Protection by flameproof enclosure (d) EN 13463-5, Non-electrical equipment for use in potentially explosive atmospheres – Protection by constructional safety (c) EN 13463-6, Non-electrical equipment for use in potentially explosive atmospheres – Protection by control of ignition sources (b) EN 60079-2, Electrical apparatus for explosive gas atmospheres – Pressurised enclosures "p"
(Protection by pressurization described in EN 60079-2 can also be used for non-electrical equipment.) EN 13463-8, Non-electrical equipment for use in potentially explosive atmospheres – Protection by liquid immersion (k) EN 50303, Group I, category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust. NOTE 3 Equipment designed and constructed in accordance with this European Standard for a particular category may be used in areas requiring a category with a higher level of safety by the application of additional explosion prevention and/or protection methods. Such applications are not covered in this standard. NOTE 4 Such explosion prevention and/or protection measures include for example inerting, suppression, venting or containment as described in EN 1127-1, for Group II equipment or for example by dilution, drainage, monitoring and shut-down as described in EN 1127-2 for Group I equipment. Such explosion protection methods are outside the scope of this European Standard. SIST EN 13463-1:2009
EN 13463-1:2009 (E) 7 NOTE 5 Although the normal atmospheric conditions above give a temperature range for the atmosphere of - 20 °C to + 60 °C the ambient temperature range for the equipment is - 20 °C to + 40 °C unless otherwise specified and marked, see 6.2.2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 582, Thermal spraying - Determination of tensile adhesive strength EN 1127-1:2007, Explosive atmospheres – Explosion prevention and protection – Part 1: Basic concepts and methodology EN 1127-2, Explosive atmospheres – Explosion prevention and protection – Part 2: Basic concepts and methodology for mining EN 13237:2003, Potentially explosive atmospheres – Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres EN 13463-6:2005, Non-electrical equipment for use in potentially explosive atmospheres – Part 6: Protection by control of ignition source 'b' EN 14986, Design of fans working in potentially explosive atmospheres EN 50303:2001, Group I, category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust EN 60079-0:2006, Electrical apparatus for explosive gas atmospheres – Part 0: General requirements (IEC 60079-0:2004, modified) ISO 1817:2005, Rubber, vulcanized – Determination of the effect of liquids CLC/TR 50404:2003, Electrostatics – Code of practice for the avoidance of hazards due to static electricity "Seventh Report on the Specifications and Testing Conditions relating to Fire-resistant Hydraulic Fluids Used for Power Transmission ( Hydrostatic and Hydrokinetic) in Mines", Commission of the European Communities Safety and Health Commission for Mining and Extractive Industries, Luxembourg 1994 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13237:2003 and the following apply. 3.1 equipment machines, apparatus, fixed or mobile devices, control components and instrumentation thereof and detection or prevention systems which, separately or jointly are intended for the generation, transfer, storage, measurement, control and conversion of energy and/or the processing of material and which are capable of causing an explosion through their own potential sources of ignition
[EN 1127-1:2007] NOTE 1 If equipment supplied to the user contains any interconnecting parts e.g. fastenings, pipes, etc. these form part of the equipment. SIST EN 13463-1:2009
EN 13463-1:2009 (E) 8 NOTE 2 Simple apparatus with no moving parts, containers and pipes on their own are not considered as equipment under the scope of this European Standard.
3.2 equipment category 3.2.1 equipment Group I category M 1 equipment designed and, where necessary, equipped with additional special means of protection to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a very high level of protection NOTE 1 Equipment of this category is intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by firedamp and/or combustible dust. NOTE 2 Equipment of this category is required to remain functional even in the event of rare incidents relating to equipment, with an explosive atmosphere present, and is characterised by means of protection such that: either, in the event of failure of one means of protection, at least an independent second means provides the requisite level of protection, or the requisite level of protection is assured in the event of two faults occurring independently of each other. 3.2.2 equipment Group I category M 2 equipment designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a high level of protection NOTE 1 Equipment of this category is intended for use in underground parts of mines as well as those parts of surface installations of such mines likely to be endangered by firedamp and/or combustible dust. NOTE 2 This equipment is intended to be de-energised in the presence of an explosive atmosphere. NOTE 3 The means of protection relating to equipment in this category assure the requisite level of protection during normal operation and also in the case of more severe operating conditions, in particular, those arising from rough handling and changing environmental conditions. 3.2.3 equipment Group II category 1 equipment designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a very high level of protection NOTE 1 Equipment in this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists or by air/dusts mixtures are present continuously, for long periods or frequently. NOTE 2 Equipment of this category ensures the requisite level of protection, even in the event of rare malfunctions relating to equipment, and is characterised by means of protection such that: either, in the event of failure of one means of protection, at least an independent second means provides the requisite level of protection, or the requisite level of protection is assured in the event of two faults occurring independently of each other. 3.2.4 equipment Group II category 2 equipment designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a high level of protection NOTE 1 Equipment in this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists or by air/dusts mixtures are likely to occur. SIST EN 13463-1:2009
EN 13463-1:2009 (E) 9 NOTE 2 The means of protection relating to equipment in this category ensures the requisite level of protection, even in the event of frequently occurring disturbances or equipment faults which are normally taken into account. 3.2.5 equipment Group II category 3 equipment designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a normal level of protection NOTE 1 Equipment in this category is intended for use in areas in which explosive atmospheres caused by mixtures of air and gases, vapours or mists or by air/dusts mixtures are unlikely to occur or, if they do occur, are likely to do so only infrequently and for a short period only. NOTE 2 Equipment of this category ensures the requisite level of protection during normal operation. 3.3 possible ignition source any kind of ignition source NOTE 1 See EN 1127-1 for a list of all possible ignition sources. NOTE 2 See Figure 1 3.4 equipment related ignition source any possible ignition source, which is caused by the equipment under consideration regardless of its ignition capability NOTE 1 These are sometimes called "relevant ignition sources", however this can lead to misunderstanding as to whether the ignition source is relevant in terms of it being present, in terms of its ignition capability or in terms of whether it is present in the equipment or not.
NOTE 2 All equipment related ignition sources are considered in the ignition hazard assessment to determine whether they are potential ignition sources. NOTE 3 See Figure 1 3.5 potential ignition source equipment related ignition source which has the capability to ignite an explosive atmosphere (i.e. to become effective) NOTE 1 The probability of becoming effective determines the equipment category (they may arise in normal operation, expected malfunction, rare malfunction). NOTE 2 See Figure 1 3.6 effective ignition source potential ignition source which is able to ignite an explosive atmosphere when consideration is taken of when it occurs (i.e. in normal operation, expected malfunction or rare malfunction) which determines the intended category NOTE 1 An effective ignition source is a potential ignition source which can ignite the explosive atmosphere if preventive or protective measures are not used. NOTE 2 For example the frictional heat which may be produced by a bearing is a possible ignition source. This is an equipment related ignition source if the piece of equipment contains a bearing. If the energy which may be produced by the friction in the bearing is capable of igniting an explosive atmosphere then this is a potential ignition source. Whether this potential ignition source is effective depends on the probability that it will occur in a particular situation (e.g. following loss of lubrication). NOTE 3 See Figure 1 SIST EN 13463-1:2009
EN 13463-1:2009 (E) 10
Figure 1 — Relationship between ignition source definitions 3.7 normal operation situation when the equipment, protective systems, and components are operating for their intended use within their design parameters NOTE 1 Failures (such as a breakdown of pump seals, flange gaskets or releases of substances caused by accidents) which involve repair or shut-down are not considered to be part of normal operation
NOTE 2 Minor releases of flammable material may be part of normal operation. For example, releases of substances from seals which rely on wetting by the fluid which is being pumped are considered to be minor releases. [EN 13237:2003] 3.8 malfunction equipment, protective systems and components do not perform the intended function NOTE 1 See also EN ISO 12100-1:2003, 5.3 b) 2) NOTE 2 For the purposes of this standard this can happen due to a variety of reasons, including – variation of a property or of a dimension of the processed material or of the workpiece; – failure of one (or more) of the component parts of the equipment, protective systems and components; – external disturbances (e.g. shocks, vibration, electromagnetic fields); – design error or deficiency (e.g. software errors); – disturbance of the power supply or other services; – loss of control by the operator (especially for hand-held machines). 3.8.1 expected malfunction disturbances or equipment faults which are known to occur in practice SIST EN 13463-1:2009
EN 13463-1:2009 (E) 11 3.8.2 rare malfunction type of malfunction which may happen only in rare instances NOTE For example, this includes two independent expected malfunctions which, separately, would not create an ignition hazard but which, in combination, do create an ignition hazard, are regarded as a single rare malfunction. 3.9 maximum surface temperature temperature used for marking of the equipment which is the highest temperature that can be attained in service under the most adverse operating conditions (but within the recognised tolerance) by any part or surface of equipment, protective system or component which can produce an ignition of the surrounding explosive atmosphere with an appropriate safety margin NOTE 1 The maximum surface temperature is determined according to 8.2 and includes safety margins depending on the category of the equipment. As a result of the application of safety margins according to 8.2, the maximum surface temperature, in most cases, will be in excess of the highest measured surface temperature. NOTE 2 The surface temperature which is relevant can be internal or external depending upon the type of ignition protection concerned. NOTE 3 For equipment intended for use in explosible dust atmospheres, the surface temperature is determined without any deposited dust on the equipment, see 6.2.3. 3.10 maximum possible potential energy maximum amount of energy which can be stored in an equipment or in parts of an equipment and can dissipate into kinetic energy during release 3.11 type of ignition protection types of protection covered by specific standards NOTE For information see list in the scope. 3.12 non-electrical equipment equipment which can achieve its intended function mechanically 4 Equipment categories and explosion groups 4.1 Equipment category Equipment for potentially explosive atmospheres is divided into: a) Group I equipment for mines susceptible to firedamp; this group comprises two categories according to the level of safety provided: i. Category M1; ii. Category M2. b) Group II Equipment for places with a potentially explosive atmosphere, other than mines susceptible to firedamp; this group comprises three categories according to the level of safety provided: i. Category 1; ii. Category 2; SIST EN 13463-1:2009
EN 13463-1:2009 (E) 12 iii. Category 3. Equipment intended for mines where the atmosphere, in addition to firedamp, may contain significant proportions of other flammable gases and/or combustible dusts (i.e. other than methane or coal dust), shall be constructed and tested in accordance with the requirements relating to Group I and also to the subdivision of Group II corresponding to the other significant flammable gases. This equipment shall then be marked appropriately. NOTE Group I equipment tested in a firedamp air mixture does not need any additional testing to demonstrate its suitability for
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