SIST EN 13463-5:2004
(Main)Non-electrical equipment intended for use in potentially explosive atmospheres - Part 5: Protection by constructional safety "c"
Non-electrical equipment intended for use in potentially explosive atmospheres - Part 5: Protection by constructional safety "c"
1.1 This European standard specifies the requirements for the design and construction of non-electrical equipment, intended for use in potentially explosive atmospheres, protected by the type of protection Constructional Safety "c".
1.2 This standard supplements the requirements in EN 13463-1, the contents of which also apply in full to equipment constructed in accordance with this standard.
1.3 Equipment complying with the relevant clauses of this standard meet the requirements for the following categories:
Equipment Group I Category M2;
Equipment Group II Category 2G or 2D;
Equipment Group II Category 1G or 1D;
NOTE The requirements for Group I, Category M1 equipment, are given in EN 50303 which specifies the requirements for both electrical and non-electrical equipment.
1.4 The type of ignition protection described in the standard can be used either on it's own or in combination with other types of ignition protection to meet the requirements for equipment of Group I, categories M1 and M2 or Group II, categories 1 and 2 depending on the ignition hazard assessment in EN 13463-1.
Nicht-elektrische Geräte für den Einsatz in explosionsgefährdeten Bereichen - Teil 5: Schutz durch Konstruktive Sicherheit "c"
Appareils non électriques destinés a etre utilisés en atmospheres explosibles - Partie 5: Protection par sécurité de construction "c"
1.1 Diese Europäische Norm legt die Anforderungen an den Aufbau und die Konstruktion von nichtelektrischen Geräten fest, die in explosionsgefährdeten Bereichen eingesetzt werden sollen und durch die Schutzart Konstruktive Sicherheit ?c" geschützt sind.
1.2 Diese Norm ergänzt die Anforderungen von EN 13463-1, deren Inhalt insgesamt auch für Geräte gilt, deren Konstruktion der vorliegenden Norm entspricht.
1.3 Geräte, die den entsprechenden Abschnitten der vorliegenden Norm entsprechen, erfüllen die Anforderungen für die folgenden Kategorien:
3 Gruppe I, Kategorie M2;
3 Gruppe II, Kategorie 2G oder 2D;
Gruppe II, Kategorie 1G oder 1D.
ANMERKUNG Die Anforderungen für die Gruppe I, Geräte der Kategorie M1, sind in EN 50303 enthalten, die die Anforderungen sowohl für elektrische als auch für nichtelektrische Geräte festlegt.
1.4 Um die Anforderungen an Geräte der Gruppe I, Kategorien M1 und M2 oder der Gruppe II, Kategorien 1 und 2 entsprechend der Bewertung der Zündgefahr in EN 13463-1 zu erfüllen, kann die in der Norm beschriebene Zündschutzart entweder einzeln oder in Verbindung mit anderen Zündschutzarten verwendet werden.
Neelektrična oprema za uporabo v potencialno eksplozivnih atmosferah – 5. del: Zaščita s konstrukcijsko varnostjo “c”
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Non-electrical equipment intended for use in potentially explosive atmospheres - Part 5: Protection by constructional safety "c"Appareils non électriques destinés a etre utilisés en atmospheres explosibles - Partie 5: Protection par sécurité de construction "c"Nicht-elektrische Geräte für den Einsatz in explosionsgefährdeten Bereichen - Teil 5: Schutz durch Konstruktive Sicherheit "c"13.230Varstvo pred eksplozijoExplosion protectionICS:SIST EN 13463-5:2004enTa slovenski standard je istoveten z:EN 13463-5:200301-februar-2004SIST EN 13463-5:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13463-5December 2003ICS 13.230English versionNon-electrical equipment intended for use in potentiallyexplosive atmospheres - Part 5: Protection by constructionalsafety “c”Appareils non électriques destinés à être utilisés enatmosphères explosibles - Partie 5: Protection par sécuritéde construction “c”Nicht-elektrische Geräte für den Einsatz inexplosionsgefährdeten Bereichen - Teil 5: Schutz durchKonstruktive Sicherheit “c”This European Standard was approved by CEN on 1 September 2003.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13463-5:2003 E
EN 13463-5:2003 (E)2ContentspageForeword.31Scope.42Normative references.53Terms and definitions.54General.55Requirements for moving parts.76Requirements for bearings.87Requirements for power transmission systems.98Requirements for clutches and couplings.119Requirements for brakes and braking systems.1110Requirements for springs and absorbing elements.1211Requirements for conveyor belts.1212Marking.13Annex A (informative)
Examples of some of the thought processes and principles used in theconstruction of items of equipment protected by 'Constructional Safety' protection.14Annex B (normative)
Test requirements.21Annex ZA (informative)
Clauses of this European Standard addressing essential requirements or otherprovisions of EU Directives.23Bibliography.29
EN 13463-5:2003 (E)3ForewordThis document EN 13463-5:2003 has been prepared by Technical Committee CEN/TC 305 “Potentially explosiveatmospheres - 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 orby endorsement, at the latest by June 2004, and conflicting national standards shall be withdrawn at the latest byJune 2004.This document has been prepared under a mandate given to CEN by the European Commission and the EuropeanFree Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.Annex A is informative. Annex B is normative.This document includes a Bibliography.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
EN 13463-5:2003 (E)4IntroductionNon-electrical equipment has been used for over 150 years in industries having potentially explosive atmospheresand a great deal of experience has been gained in the application of protective measures to reduce the risk of ignitionto an acceptably safe level. With the introduction of the ATEX Directive 94/9/EC and the inclusion of non-electricalequipment in its scope, it became necessary to produce ignition protection concept standards which clearly definedthese protective measures and incorporated the extensive and diverse experience gained over the years.One of the methods of applying ignition protection, had been to select types of equipment not containing an ignitionsource in normal service and then apply good engineering principles, so that risk of mechanical failures likely to createincendive temperatures or sparks, was reduced to a very low level. Such protective measures are referred to in thisstandard as ignition protection by 'Constructional Safety', or type of protection 'c'.The purpose of this standard, is therefore to specify the requirements for equipment, protected by the type ofprotection 'c' which meets the essential safety and health requirements described in Directive 94/9/EC.1 Scope1.1This European standard specifies the requirements for the design and construction of non-electrical equipment,intended for use in potentially explosive atmospheres, protected by the type of protection Constructional Safety "c".1.2This standard supplements the requirements in EN 13463-1, the contents of which also apply in full toequipment constructed in accordance with this standard.1.3Equipment complying with the relevant clauses of this standard meet the requirements for the followingcategories:¾ Equipment Group I Category M2;¾ Equipment Group II Category 2G or 2D;¾ Equipment Group IICategory 1G or 1D;NOTEThe requirements for Group I, Category M1 equipment, are given in EN 50303 which specifies the requirements forboth electrical and non-electrical equipment.1.4The type of ignition protection described in the standard can be used either on it's own or in combination withother types of ignition protection to meet the requirements for equipment of Group I, categories M1 and M2 orGroup II, categories 1 and 2 depending on the ignition hazard assessment in EN 13463-1.
EN 13463-5:2003 (E)52 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 982, Safety of machinery - Safety requirements for fluid power systems and their components – Hydraulics.EN 983, Safety of machinery - Safety requirements for fluid power systems and their components – Pneumatics.EN 1127-1:1997, Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts andmethodology.EN 1127-2:2002, Explosive atmospheres - Explosion prevention and protection – Part 2: Basic concepts andmethodology for mining.EN 13463-1:2001, Non-electrical equipment for potentially explosive atmospheres - Part 1: Basic method andrequirements.prEN 13463-6, Non-electrical equipment for potentially explosive atmospheres — Part 6: Protection by control ofignition source 'b'.EN 13463-8, Non-electrical equipment for potentially explosive atmospheres — Part 8: Protection by liquidimmersion 'k'.EN 13478, Safety of machinery - Fire prevention and protectionEN 13501-1, Fire classification of construction products and building elements - Part 1: Classification using testdata from reaction to fire testsEN 60529:1991, Degrees of protection provided by enclosures (IP Code), (IEC 60529:1989).3 Terms and definitionsFor the purposes of this European Standard, the terms and definitions given in EN 13463-1:2001, EN 1127-1:1997and EN 1127-2:2002 and the following apply.3.1type of protection constructional safety "c"type of ignition protection in which constructional measures are applied so as to protect against the possibility ofignition from hot surfaces, sparks and adiabatic compression generated by moving parts3.2mechanical sparkssparks, as well as showers of sparks, produced by impact or friction between two similar or dissimilar solid materials4 General4.1 Determination of suitabilityBefore a decision is made to protect equipment or pieces of equipment for use as an assembly includinginterconnecting parts by the measures described in this standard, it shall have been subjected to the ignition hazardassessment in accordance with EN 13463-1. Furthermore, It shall also have been determined that, by enhancing orincreasing the safety of certain vulnerable parts, the required level of protection is ensured against the possibility ofignition sources occurring.
EN 13463-5:2003 (E)64.2 Parts of equipmentAll parts and interconnecting parts of equipment shall be capable of functioning in conformity with the operationalparameters established by the manufacturer throughout their foreseeable lifetime and be sufficiently firm and durableto withstand the mechanical and thermal stresses to which they will be subjected.4.3 Ingress Protection4.3.1 GeneralThe degree of ingress protection (IP) provided by the outer enclosures of equipment depends upon its intendedduty and the type of environment it is designed to be used in. An appropriate rating, according to IP category 1, asspecified in 13.4 of EN 60529:1991, shall be determined as part of the ignition hazard assessment (see 4.1) andshall be able to prevent foreign objects or water entering the equipment which could:i) reduce the ignition level to a lower value, by for example, allowing combustible dust, with a lowerignition temperature than the potentially explosive atmosphere, to form a layer on hot internalcomponents or parts of the equipment; and/orii) make contact with moving parts, resulting in the creation of a potential ignition source, unsafemalfunction or fire.The following subclauses, 4.3.3 to 4.3.5 below, specify the minimum degree of ingress protection (IP) for enclosuresused in the circumstances described.4.3.2In the case of equipment intended for use in gas/vapour atmospheres, where entry of foreign objects cancause ignition, but entry of dust is harmless, entry of falling objects shall be prevented.4.3.3In the case of equipment intended for use in gas/vapour atmospheres, where the entry of dusts or liquidscould cause malfunction leading to an ignition source, the enclosure shall be at least IP 54.4.3.4In the case of equipment intended for use in potentially explosive dust atmospheres, where ingress of dustcan result in an ignition source or fire, the enclosure shall be at least IP 6X.4.3.5In the case of equipment intended for use in potentially explosive dust atmospheres, where ingress of dustand foreign objects are not likely to cause an ignition, no enclosure is necessary.NOTEAn enclosure can be required for other safety reasons, e.g. IP 2X to prevent parts of the body coming into contactwith rotating parts.4.4 Seals for moving parts4.4.1 Unlubricated gaskets, seals, sleeves, bellows and diaphragmsUnlubricated gaskets, seals, sleeves, bellows and diaphragms which are subject to rubbing contact in normaloperation or during foreseeable malfunction, shall not contain light metals. Sleeves made of elastomeric material,PTFE or similar material, graphite and ceramics are suitable.Non-metallic materials shall be resistant to distortion and degradation without reducing the effectiveness of explosionprotection (see EN 13463-1).4.4.2 Stuffing box sealsStuffing-box seals shall only be used if a temperature rise above the maximum surface temperature can be excluded.NOTEA device to monitor temperatures and switch off equipment should be employed.4.4.3 Lubricated sealsSeals which normally require the presence of a replenishable lubricant to prevent hot surfaces occurring at theirinterface with equipment parts shall be designed to ensure the sufficient presence of lubricant or shall be protectedby one of the following means:
EN 13463-5:2003 (E)7- provision of an effective means to monitor the continued presence of the lubricant; or- provision of a temperature detection device to warn of increasing temperatures; or- design of the equipment to be capable of completing the ‘dry run’ test, as described in annex B, without exceedingthe maximum surface temperature of the equipment and/or suffering damage which would reduce the effectivenessof its ignition protection properties.NOTEMonitoring can be either continuous or by appropriate inspection and examination.The manufacturer's instructions shall include details relating to the correct lubrication, monitoring and maintenance ofsuch seals.4.5 Equipment lubricants/ Coolants/ Fluids4.5.1Lubricants and/or coolants, which are required for the prevention of potentially incendive hot surfaces ormechanical sparks (see EN 13463-8), shall have an ignition temperature (see IEC 60079-4) at least 50 K above themaximum surface temperature of the equipment where the liquid is being used.4.5.2Any fluid which can be released shall not cause an ignition.NOTEFor example due to high temperature or electrostatic charging.5 Requirements for moving parts5.1 GeneralThe ignition hazard assessment (see 4.1) shall identify those moving parts which through premature failure, orwear, could lead to the occurrence of unsafe vibration or impact or friction. Such parts shall either be constructed insuch a way so that either they do not become an ignition source during the lifetime of the equipment, taking theequipment category into consideration or manufacturers instructions shall specify the measures to be taken.NOTESlow moving parts with a circumferential speed of less than 1 m/s do not normally need protection against heating byfriction and mechanical sparks. For equipment with very high speed moving parts Constructional Safety "c" might not be suitable. Inthese cases other types of protection should be considered, for example, a flameproof 'd' enclosure or a pressurised 'p' enclosure.5.2 VibrationUnintentional vibration from moving parts leading to the creation of potentially incendive hot surfaces or mechanicalsparks, shall be avoided. Unintentional vibration can arise from equipment itself, or from the place where it ismounted. Potential incendive hot surfaces or mechanical sparks from this cause shall be avoided. Themanufacturer shall provide any necessary installation, operation and maintenance instructions. In particular theinstructions shall specify the correct operating speed range of the equipment.NOTE 1Alternatively the equipment can be provided with a vibration controlling device arranged to control any potentialsource of ignition associated with excessive vibration of moving parts (see prEN 13463-6).NOTE 2Where the melting point of the material used in the construction of moving parts is below the maximum surfacetemperature of the equipment, or is not capable of causing potentially incendive hot surfaces and/or mechanical sparks, additionalprotective measures are not normally necessary (e.g. the provision of a low melting point sacrificial wear plate; the use of a plasticfan inside a metal housing, or a metallic fan with sacrificial non-sparking low melting point fan blade-tips).5.3 ClearanceClearances between non-lubricated moving parts and fixed parts shall be dimensioned so that frictional contact, ableto produce potentially incendive hot surfaces and/or mechanical sparks, are avoided (see the above note for some ofthe precautions which may be adopted for the purpose of foreseeable malfunction).NOTEIn the case of parts protected by fluids see EN 13463-8.
EN 13463-5:2003 (E)85.4 LubricationMoving parts which depend on the presence of a lubricating medium to prevent a temperature rise exceeding themaximum surface temperature, or the creation of incendive mechanical sparks shall be constructed to ensure thepresence of the lubricating medium. This can be achieved by an oil splash lubricator, or an automatic greasingsystem or a manual system of monitoring the oil level, together with suitable instructions about regular servicingand the recommended frequency of inspection. Where this is not possible alternative measures to control theignition risk shall be used. (e.g. temperature sensors which operate an alarm before a potentially incendivetemperature is reached, or a temperature sensor arranged to control the potential source of ignition (see prEN13463-6).Where equipment is designed to process liquids as part of its duties and the presence of the process liquid isessential for the purpose of lubrication, cooling, quenching, or ignition prevention, this shall be stated in themanufacturer's instructions, as required by EN 13463-1.6 Requirements for bearings6.1 GeneralBearings are basically divided into three types, sliding plane motion, sliding rotary motion and rolling element.When assessing bearings, as part of the ignition hazard assessment required by EN 13463-1 (see 4.1), thefollowing (which is not a definitive list) shall be taken into account:· the bearing shall be designed for the equipment’s intended duty e.g. speed, loading and variations of speedand loading;· the bearing’s basic rated life. As described in ISO 281 for rolling element bearings. (see also NOTE 1 below);· the proper fit of the bearings in their housing and on the shaft (tolerances, roundness and surface quality),taking into consideration the vertical and axial loads on the bearing with respect to shaft and housing;· the correct alignment of the bearings;· the axial and radial loading of the bearings caused by thermal expansion of the shaft and the housing under themost severe operating conditions;· protection of the bearing from ingress of water and solids, if necessary to avoid premature failure;· protection of the bearing from electrical currents, including stray circulating currents (which can cause, forexample, incendive sparking, or spark erosion leading to premature failure, at the point of contact between theball and ball race of a ball bearing);· the provision of adequate lubrication, according to the lubricating regime necessary for the type of bearing (e.g.for sliding bearings, boundary lubrication, mixed film, or full film hydrodynamic lubrication are the mostcommonly used regimes);· recommended maintenance intervals;· replacement after unacceptable wear or the end of its recommended life, whichever comes first;· protection of the bearing from vibration, especially at standstill.Where any of the above relies on the user performing manual checks to detect malfunction or impendingmalfunction, the necessary information shall be included in the manufacturer’s instructions required by EN 13463-1.For category 1 equipment the manufacturer shall specify any necessary running in period, during which time nosource of a flammable atmosphere should exist around the equipment.NOTE 1At the present time, no suitable experimental test exists to demonstrate that a given type of bearing has a low risk ofbecoming an ignition source in service. Ball and roller bearing manufacturers do however quote a basic rated life corresponding
EN 13463-5:2003 (E)9to a probability of mechanical failure occurring during operation (e.g. failure by deformation of an element, or fatigue flaking orspalling occurring on one of its elements). This basic rating can be used in the ignition hazard assessment in an attempt todetermine the risk of bearing malfunction that might lead to the production of an incendive hot surface or sparks. The basic ratedlife of a ball/roller bearing is based on the amount of radial and axial loading that a ball/roller bearing can theoretically endure forone million revolutions. It is usually expressed as an “L” value in terms of foreseeable lifetime operating revolutions, orforeseeable lifetime hours of service. In an attempt to reduce the risk of malfunction in service to a minimum, it is paramount thatthe equipment manufacturer pays attention to good design, the ratio of the axial and radial loadings, construction, lubrication,cooling, and maintenance procedures. Also that regular examination is recommended during operation, in an attempt to detectimpending malfunction.NOTE 2The service life of bearings depends greatly on the service conditions and it is therefore not possible to calculatetheir service life reliably.NOTE 3Plain bearings are not affected, because it is not possible to calculate their service life. Lubrication should beensured as specified in 6.2.Bearings shall conform to the current state of technology. They shall be regularly inspected and/or monitored inorder to prevent risk of ignition.The manufacturer's instructions for the equipment shall include details of necessary servicing, service frequencyand appropriate maintenance.6.2 LubricationBearings which depend on the presence of a lubricating medium to prevent a temperature rise exceeding themaximum surface temperature, or the creation of incendive mechanical sparks shall be constructed to ensure thepresence of the lubricating medium. This can be achieved by bearings that are sealed for life, an oil splashlubricator, or an automatic greasing system or a manual system of monitoring the oil level, together with suitableinstructions about regular servicing and the recommended frequency of inspection. Where this is not possiblealternative measures to control the ignition risk shall be used (e.g. temperature sensors which operate an alarmbefore a potentially incendive temperature is reached, or a temperature sensor arranged to control the potentialsource of ignition (see prEN 13463-6).Where equipment is designed to process liquids as part of its duties and the presence of the process liquid isessential for the purpose of lubrication, cooling, quenching, or ignition prevention, this shall be stated in themanufacturer's instructions, as required by EN 13463-1.6.3 Chemical compatibilityBearings shall be made of materials resistant to the liquids, or vapours, in which they are intended to be used.Similarly, the material used in the construction of the bearing, including any bearing cages, shall be resistant to anyliquids or solvents which can come into contact with them. Particular attention shall be given to the possibility ofswelling of non-metallic parts. Where liquids or vapours can dissolve in the lubricant of the bearings, the lubricant shallremain 'fit for purpose' even in this condition.7 Requirements for power transmission systems7.1 Gear drives7.1.1Gear drives shall comply with the requirements of clause 5. Where the ignition hazard assessment (4.1)shows there could still be an ignition source another form of ignition protection shall be used (e.g. EN 13463-8protection by liquid immersion).7.1.2Where equipment includes facilities to change the gear ratios (manually, or automatically), the gear changingmechanisms shall be so arranged as to ensure that they are incapable of producing either temperatures exceedingthe maximum surface temperature or incendive mechanical sparks.7.2 Belt drives7.2.1Power transmission belts shall be incapable of developing an incendive electrostatic discharge duringoperation (see ISO 1813 and CENELEC Technical Report – CLC/TR 50404: 2003-6).
EN 13463-5:2003 (E)107.2.2The materials used in the construction shall be non-combustible and/or not supporting or propagatingcombustion. These are e.g. materials classified as A1, A2 or B according to EN 13501-1 (see EN 13478). Theirselection shall be made under consideration of the risk analysis.7.2.3For drives which could cause surfaces to exceed the maximum surface temperature if the belt becomesslack or slips on the pulley, the correct belt tension shall be maintained.NOTEDevices used to ensure correct belt tension can also serve to detect broken belts.7.2.4With drives which could cause surfaces to exceed the maximum temperature if they run out of alignment,true alignment shall be maintained (see 7.2.3).NOTEAlternatively, belt drives can be fitted with devices to monitor temperature, in order to prevent surfaces becoming anignition risk (see prEN 13463-6).7.2.5The supporting frame, chassis, or structure, of equipment containing belt(s) shall be constructed ofelectrically conducting material and shall be so arranged as to provide a leakage path to earth for any staticelectricity which occurs on the belt(s). The frame, chassis or structure includes the driving pulley or drum and anyidler pulleys or rollers associated with the belt drive. Specific electrical bonding between the separate parts andearth shall be provided where the electrical resistance of the leakage path to earth exceeds 1 Giga-Ohm.NOTEWhere the drive pulley or drive roller is powered by a mains fed electrical motor the electrical connection to earth,normally provided for the electric motor, can be taken into account.7.2.6Drives capable of producing hot surfaces exceeding the maximum surface temperature, as a result of thestalling of the output power shaft, while the input continues to rotate, shall have means to detect the stalled output,and prevent ignition.7.3 Chain drivesChain drives shall comply with the requirements of clause 5.Chain drives operating at speeds greater than 1 m/s,and containing a potential ignition source (identified by theignition hazard assessment required by EN 13463-1), shall be fitted with means to ensure continuous positiveengagement of the chain with its associated sprocket. Where this is not possible, it shall be fitted with a device thatremoves the driving power to the drive sprocket in the event of the chain breaking, becoming disengaged, orslackening beyond a limit specified by the manufacturer’s instructions (see prEN 13463-6).7.4 Other DrivesOther drives shall fulfil the requirements set out in clause 5.7.5 Hydrostatic/Hydrokinetic/Pneumatic – equipment7.5.1Hydrostatic/hydrokinetic and pneumatic power transmission equipment shall be constructed of pipes,enclosures and/or other external parts, which do not produce hot surfaces exceeding the maximum surfacetemperature, even when operating continuously at maximum normal rating.7.5.2Hydrostatic/hydrokinetic equipment shall comply with the requirements of EN 982.7.5.3Pneumatic equipment shall comply with the requirements of EN 983.7.5.4The maximum temperature of any power transmission fluid which can be released shall not exceed themaximum surface temperature of the equipment, if this can create an ignition risk.NOTEA suitable over-temperature protection device, can be a fusible plug in a fluid coupling which melts to release thepower transmission fluid from the coupling during overload/over-temperature (see prEN 13463-6).7.5.5To prevent ignition of the explosive atmosphere by burning liquid the power transmission fluid shall have asuitable fire resistance rating.NOTE 1For Group I equipment this can be achieved by using a liquid with a fire resistance rating of at least "2", when testedin accordance with the 'Community of Six Spray ignition Test' and a persistence of flame not exceeding 30 s, when tested inaccordance with the 'Wick test', as described in 3.1.1 and 3.2 of the European Safety and Health Commission for Mining and
EN 13463-5:2003 (E)11Other Extractive I
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