SIST EN 61241-0:2007
(Main)Electrical apparatus for use in the presence of combustible dust -- Part 0: General requirements
Electrical apparatus for use in the presence of combustible dust -- Part 0: General requirements
Specifies general requirements for the design, construction, testing and marking of electrical apparatus protected by any recognized safeguard technique for use in areas where combustible dust may be present in quantities that could lead to a fire or explosion hazard. The application of electrical apparatus in atmospheres which may contain explosive gas as well as combustible dust, whether simultaneously or separately, requires additional protective measures.
Elektrische Betriebsmittel zur Verwendung in Bereichen mit brennbarem Staub -- Teil 0: Allgemeine Anforderungen
Matériels électriques pour utilisation en présence de poussières combustibles -- Partie 0: Exigences générales
Spécifie les exigences générales de conception, de construction, d'essais et de marquage des matériels électriques protégés par toute technique reconnue pour une utilisation dans des zones où de la poussière combustible peut être présente en quantités qui pourraient conduire à un risque d'explosion ou à un risque d'incendie. La mise en oeuvre de matériels électriques dans des atmosphères qui peuvent contenir des gaz explosifs ainsi que des poussières combustibles, que ce soit simultanément ou séparément, nécessite l'application de mesures de protection supplémentaires. Le contenu du corrigendum de novembre 2005 a été pris en considération dans cet exemplaire.
Električne naprave za uporabo v prisotnosti gorljivega prahu - 0. del: Splošne zahteve (IEC 61241-0:2004, spremenjen, s popravkom nov. 2005)
General Information
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Standards Content (Sample)
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EUROPEAN STANDARD EN 61241-0 NORME EUROPÉENNE
EUROPÄISCHE NORM December 2006
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2006 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61241-0:2006 E
ICS 29.260.20 Partly supersedes EN 50281-1-1:1998 + A1:2002
English version
Electrical apparatus for use in the presence of combustible dust
Part 0: General requirements (IEC 61241-0:2004, modified + corrigendum Nov. 2005)
Matériels électriques pour utilisation
en présence de poussières combustibles Partie 0: Exigences générales (CEI 61241-0:2004, modifiée + corrigendum nov. 2005)
Elektrische Betriebsmittel zur Verwendung in Bereichen mit brennbarem Staub
Teil 0: Allgemeine Anforderungen (IEC 61241-0:2004, modifiziert + Corrigendum Nov. 2005)
This European Standard was approved by CENELEC on 2005-09-13. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
EN 61241-0:2006 - 2 - Foreword The text of document 31H/173/FDIS, future edition 1 of IEC 61241-0, prepared by SC 31H, Apparatus for use in the presence of combustible dust, of IEC TC 31, Equipment for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote. A draft amendment, prepared by the Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres - General requirements, containing some common modifications to the text of document 31H/173/FDIS, was submitted to the formal vote. The two texts were combined and approved by CENELEC as EN 61241-0 on 2005-09-13. This standard, and the other parts within this series, was developed to align protection methods associated with electrical apparatus for use in the presence of combustible dust and those similar protection methods associated with the EN 60079 series of standards, where possible. This European Standard, together with EN 61241-1:2004, supersedes EN 50281-1-1:1998 +
corrigendum August 1999 + A1:2002. The following dates were fixed: – latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop)
2007-07-01 – latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow)
2008-10-01 This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and covers essential requirements of EC Directive 94/9/EC. See Annex ZZ. NOTE 1 Other EC Directives may be applicable. NOTE 2 Subclauses, notes and annexes that are additional to those in IEC 61241-0 are prefixed with the letter Z. Annexes ZA, ZB and ZZ have been added by CENELEC. __________
- 3 - EN 61241-0:2006 Endorsement notice The text of the International Standard IEC 61241-0:2004, with its corrigendum November 2005, was approved by CENELEC as a European Standard with agreed common modifications as given below. COMMON MODIFICATIONS 1 Scope Add after the first paragraph: This Part 0 of EN 61241 covers Category 1D, 2D and 3D apparatus. Only in cases specifically mentioned, the requirements differ for Categories 1D, 2D and 3D. In all cases where apparatus are involved, the references to zones shall be read
Zone 20
Category 1D
Zone 21
Category 2D or Category 1D
Zone 22
Category 3D or Category 1D or 2D 2 Normative references Add: See also Annex ZB. 3 Terms and definitions Add: 3.Z1 category within an equipment group, a category is the classification according to the required level of protection NOTE
The categories are defined as given in Annex ZA.
4 Construction 4.2 Principles for design and testing of apparatus for use in Zone 20 Replace by: 4.2 Void Add: 4.Z1 Mechanical strength of apparatus The apparatus shall be subjected to the tests of 23.4.2. Guards relied upon to provide protection from impact shall be removable only by the use of a tool and shall remain in place for the required impact tests.
EN 61241-0:2006 - 4 - 6 Enclosure material 6.1 Non-metallic enclosures and non-metallic parts of enclosures Replace the text by: The following requirements apply to non-metallic enclosures and non-metallic parts of enclosures on which the type of protection depends. In addition, the requirements of 23.4.7 shall apply for Category 1D or Category 2D apparatus. For Category 3D electrical apparatus the requirements of 23.4.7 shall also apply, but with the modifications given in 23.4.7.3 for the Category 3D apparatus. 6.1.5 Electrostatic charges Add: If there is danger that plastic enclosures or plastic parts of enclosures can be charged to a dangerous level in normal operation, also Category 3D electrical apparatus shall be designed in line with 6.1.5.1 and 6.1.5.2. Enclosures designed not in line with 6.1.5.1 and 6.1.5.2 shall be clearly marked and the restriction in use stated. 6.2.1 Composition Add: For Category 3D electrical apparatus no restrictions shall be observed except for fans, fan hoods, and ventilating screens. These parts shall comply with the requirements for Category 2D. 10 Materials used for cementing 10.2 Thermal stability Add: For Category 3D electrical apparatus, the thermal stability shall be considered adequate if the lower limiting value of temperature for the material are below or equal to the lowest working temperature specified for the material, and the continuous operating temperature (COT) is at least 10 K above the maximum service temperature.
- 5 - EN 61241-0:2006 16 Supplementary requirements for specific electrical apparatus – Rotating electrical machines 16.3 Clearances for the ventilating system for use in Zone 20 or 21 Replace the entire subclause by: 16.3 Clearances for the ventilating system
16.3.Z1 Clearances for the ventilating system of Category 1D and 2D electrical apparatus In normal operation the clearances, taking into account design tolerances, between the external fan and its hood, ventilation screens and their fasteners shall be at least one hundredth of the maximum diameter of the fan, except that the clearances need not exceed 5 mm and may be reduced to 1 mm if the opposing parts are manufactured so as to have dimensional accuracy and stability. In no case shall the clearance be less than 1 mm. 16.3.Z2 Clearances for the ventilating system of Category 3D electrical apparatus In normal operation the clearances, taking into account design tolerances, between the external fan and its hood shall be in no case less than 1 mm. 16.4 Materials for external fan and fanhoods Add: 16.4.Z1 Thermal stability of plastic materials for Category 3D electrical apparatus The thermal stability of plastic materials shall be considered adequate if the COT specified by the manufacturer of the plastic material exceeds the maximum temperature to which the material is subjected in service (within the rating) by at least 10 K. 16.4.Z2 Materials containing light metals for Category 3D electrical apparatus The external fans, fan hoods and ventilation screens of rotating electrical machines manufactured from materials containing light metals shall not contain by weight more than 7,5 % in total of magnesium and titanium. 20 Luminaires 20.5 Parts remaining energized Replace the text by: 20.5.Z1 Category 1D and 2D electrical apparatus In the case of 20.4 a), where it is intended that some parts other than the lampholder will remain energized after operation of the disconnecting device, then in order to minimize the risk of explosion, those energized parts shall be protected by – clearances and creepage distances between phases (poles) and to earth in accordance with the requirements of EN 60079-7; and – an internal supplementary enclosure (which can be the reflector for the light source) which contains the energized parts and provides a degree of protection of at least IP30, according to EN 60529; and
EN 61241-0:2006 - 6 - – marking on the internal supplementary enclosure with the warning “DO NOT OPEN WHEN ENERGIZED”. 20.5.Z2 Category 3D electrical apparatus In the case of 20.4 a), where it is intended that some parts other than the lampholder will remain energized after operation of the disconnecting device, in order to minimize the risk, those energized parts shall be protected by – clearances and creepage distances between phases (poles) and to earth in accordance with the
requirements of EN 60664; and – an internal supplementary enclosure (which can be the reflector for the light source) which contains the energized parts and provides a degree of protection of at least IP20, according to EN 60529; and – marking on the internal supplementary enclosure with the warning “DO NOT OPEN WHEN ENERGIZED”. 23 Verifications and tests 23.4.7.3
Thermal endurance to heat Add: For Category 3D electrical apparatus the thermal endurance to heat is determined by submitting the enclosures or parts of enclosures in plastic materials on which the integrity of the type of protection depends to continuous storage for four weeks in an ambience of (90 ± 5) % relative humidity and at a temperature of (10 ± 2) K above the maximum service temperature, but at least 80 °C. In the case of a maximum service temperature above 75 °C, the period of four weeks specified above shall be replaced by a period of two weeks at (95 ± 2) °C and (90 ± 5) % relative humidity followed by a period of two weeks at a temperature of (10 ± 2) K higher than the maximum service temperature. 29 Marking Add: 29.Z1 Instructions All electrical apparatus shall be accompanied by instructions, including the following particulars as a minimum: a) a recapitulation of the information with which the electrical apparatus is marked, except for the serial number together with any appropriate additional information to facilitate maintenance (for example, address of the importer, repairer, etc.); b) instructions for the safe – putting into service, – use, – assembling and dismantling, – maintenance (servicing and emergency repair),
- 7 - EN 61241-0:2006 – installation, – adjustment; c) where necessary, training instructions; d) details which allow a decision to be made as to whether the apparatus can be used safely in the intended area under the expected operating conditions; e) electrical and pressure parameters, maximum surface temperatures and other limit values; f) where necessary, special conditions of use, including particulars of possible misuse which experience has shown might occur; g) where necessary, the essential characteristics of tools which may be fitted to the apparatus; h) a list of the standards, including the issue date, with which the apparatus is declared to comply. A certificate can be used to satisfy this requirement. The instructions shall contain information necessary for the putting into service, maintenance, inspection, checking of correct operation and, where appropriate, repair of the apparatus, together with all useful instructions, in particular with regard to safety.
EN 61241-0:2006 - 8 - Annex ZA (informative)
Classification of electrical apparatus into categories
ZA.1 Categories ZA.1.1 Category 1D electrical apparatus Category 1D electrical apparatus needs special consideration. The apparatus shall be designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a very high level of protection. Category 1D electrical apparatus are intended for use in areas in which explosive atmospheres caused by air/dust mixtures are present continuously, for long periods or frequently. Category 1D apparatus shall ensure the requisite level of protection, even in the event of rare incidents relating to equipment, and are 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. The special requirements for Category 1D shall be investigated under simulated working conditions as stated by the manufacturer. NOTE 1 Apparatus for measurement and control techniques (e.g. instrumentation, sensors, controls) are typical applications under dust of excessive layers. NOTE 2 Power engineering apparatus (such as motors, luminaires, plugs and sockets) should, wherever practicable, be placed outside of such areas. ZA.1.2 Category 2D electrical apparatus The apparatus shall be designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a high level of protection. Category 2D electrical apparatus are intended for use in areas in which explosive atmospheres caused by air/dust mixtures are likely to occur. Category 2D apparatus shall ensure the requisite level of protection, even of frequently occurring disturbances or equipment faults which normally have to be taken into account. ZA.1.3 Category 3D electrical apparatus ZA.1.3.1 General The apparatus shall be designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a normal level of protection. Category 3D electrical apparatus are intended for use in areas in which explosive atmospheres caused by air/dust mixtures are unlikely to occur or, if they do occur, are likely to do so only infrequently and for a short period only. Category 3D apparatus shall ensure the requisite level of protection during normal operation and in certain abnormal conditions specified in this standard.
- 9 - EN 61241-0:2006 ZA.1.3.2 Potential ignition sources In normal operation and in certain abnormal conditions specified by this standard, the apparatus shall not a) produce an operational arc or spark unless that arc or spark is prevented from causing ignition of a surrounding explosive atmosphere by one of the methods described in this standard or the relevant type of protection standards as defined in Clause 1; b) develop a maximum surface temperature exceeding the maximum value , unless the temperature of the surface or hot spot is prevented from causing ignition of a surrounding explosive atmosphere by one of the methods described in this standard or the relevant type of protection standards, or is otherwise shown to be safe.
EN 61241-0:2006 - 10 - Annex ZB
(normative)
Normative references to international publications with their corresponding European publications
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.
NOTE
When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year Title EN/HD Year
IEC 60034-5
2000 Rotating electrical machines
Part 5: Degrees of protection provided by the integral design of rotating electrical machines (IP code) - Classification EN 60034-5 2001
IEC 60079-0 (mod) 2004 Electrical apparatus for explosive gas atmospheres
Part 0: General requirements EN 60079-0 2006
IEC 60079-7
2001 Electrical apparatus for explosive gas atmospheres
Part 7: Increased safety "e" EN 60079-7 2003
IEC 60079-11 1999 Electrical apparatus for explosive gas atmospheres
Part 11: Intrinsic safety "i" - -
IEC 60086-1 2000 Primary batteries
Part 1: General EN 60086-1 2001
IEC 60095 (mod) Series Lead-acid starter batteries
EN 60095 Series
IEC 60192 2001 Low pressure sodium vapour lamps - Performance specifications EN 60192 2001
IEC 60216-1 2001 Electrical insulating materials - Properties
of thermal endurance
Part 1: Ageing procedures and evaluation
of test results EN 60216-1 2001
IEC 60216-2 1990 Guide for the determination of thermal endurance properties of electrical insulating materials
Part 2: Choice of test criteria - -
IEC 60243-1 1998 Electrical strength of insulating materials - Test methods
Part 1: Tests at power frequencies EN 60243-1 1998
IEC 60285 1993 Alkaline secondary cells and batteries - Sealed nickel-cadmium cylindrical rechargeable single cells EN 60285 1)
1994
1) EN 60285 is superseded by EN 61951-1:2003, which is based on IEC 61951-1:2003.
- 11 - EN 61241-0:2006 Publication Year Title EN/HD Year IEC 60529 1989 Degrees of protection provided by
enclosures (IP Code) EN 60529 + corr. May
1991 1993
IEC 60623 2001 Secondary cells and batteries containing alkaline or other non-acid electrolytes - Vented nickel-cadmium prismatic rechargeable single cells EN 60623 2001
IEC 60662 (mod) 1980 High pressure sodium vapour lamps EN 60662 2)
1993
IEC 60947-3
1999 Low-voltage switchgear and controlgear
Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units EN 60947-3 1999
IEC 61056 Series General purpose lead-acid batteries (valve regulated types) EN 61056 Series
IEC 61150 1992 Alkaline secondary cells and batteries - Sealed nickel-cadmium rechargeable monobloc batteries in button cell design EN 61150 1993
IEC 61241-1 - 3) Electrical apparatus for use in
the presence of combustible dust
Part 1: Protection by enclosures "tD" EN 61241-1 2004 4)
IEC 61241-14 - 3) Electrical apparatus for use
in the presence of combustible dust
Part 14: Selection and installation EN 61241-14 2004 4)
ISO 48 1994 Rubber, vulcanized or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100 IRHD) - -
ISO 178 2001 Plastics - Determination of flexural
properties EN ISO 178 2003
ISO 179 Series Plastics - Determination of Charpy impact properties EN ISO 179 Series
ISO 262 1998 ISO general-purpose metric screw threads - Selected sizes for screws, bolts and nuts - -
ISO 273 1979 Fasteners - Clearance holes for bolts and screws EN ISO 273 1991
ISO 286-2 1988 ISO system of limits and fits
Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts EN 20286-2 1993
ISO 527 Series Plastics - Determination of tensile
properties
EN ISO 527 Series
ISO 965 Series ISO general-purpose metric screw threads - Tolerances
- -
2) EN 60662 includes A1:1986 + A2:1987 + A3:1990 to IEC 60662 (mod). 3) Undated reference. 4) Valid edition at date of issue.
EN 61241-0:2006 - 12 - Publication Year Title EN/HD Year ISO 1818 5) 1975 Vulcanized rubbers of low hardness
(10 to 35 IRHD) - -
ISO 4014 1999 Hexagon head bolts - Product grades
A and B EN ISO 4014 2000
ISO 4017 1999 Hexagon head screws - Product grades
A and B EN ISO 4017 2000
ISO 4026 2003 Hexagon socket set screws with flat point EN ISO 4026 2003
ISO 4027 2003 Hexagon socket set screws with cone point EN ISO 4027 2003
ISO 4028 2003 Hexagon socket set screws with dog point EN ISO 4028 2003
ISO 4029 2003 Hexagon socket set screws with cup point EN ISO 4029 2003
ISO 4032 1999 Hexagon nuts, style 1 - Product grades
A and B EN ISO 4032
2000
ISO 4762 1997 Hexagon socket head cap screws EN ISO 4762 1997 6)
ISO 4892 Series Plastics - Methods of exposure to laboratory light sources
EN ISO 4892 Series
5) Withdrawn standard. 6) EN ISO 4762:1997 is superseded by EN ISO 4762:2004, which is based on ISO 4762:2004.
- 13 - EN 61241-0:2006 Annex ZZ
(informative)
Coverage of Essential Requirements of EC Directives This European Standard has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association and within its scope the standard covers only the following essential requirements out of those given in Annex II of the EC Directive 94/9/EC: – ER 1.0.1 to ER 1.0.6 – ER 1.1.1 to ER 1.1.3 – ER 1.2.1, ER 1.2.2, ER 1.2.4 to ER 1.2.9 – ER 1.3.1 to ER 1.3.4 – ER 1.4.1, ER 1.4.2 – ER 1.6.4 1st paragraph
– ER 2.1.2.1, ER 2.1.2.2, ER 2.1.2.3 – ER 2.2.2.1 to ER 2.2.2.4 – ER 2.3.2.1 to ER 2.3.2.3 Compliance with this standard provides one means of conformity with the specified essential requirements of the Directive concerned. WARNING: Other requirements and other EC Directives may be applicable to the products falling within the scope of this standard.
NORME INTERNATIONALECEIIECINTERNATIONALSTANDARD 61241-0Première éditionFirst edition2004-07Matériels électriques pour utilisation en présence de poussières combustibles – Partie 0: Exigences générales Electrical apparatus for use in the presence of combustible dust – Part 0: General requirements Pour prix, voir catalogue en vigueur For price, see current catalogue© IEC 2004
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Web: www.iec.ch CODE PRIX PRICE CODE XCommission Electrotechnique InternationaleInternational Electrotechnical Commission
61241-0 © IEC:2004 – 3 – CONTENTS FOREWORD.11INTRODUCTION.171Scope.212Normative references.233Terms and definitions.274Construction.374.1General.374.2Principles for design and testing of apparatus for use in Zone 20.374.3Opening enclosures.374.4Environmental conditions.395Temperatures.395.1Maximum surface temperature.395.2Maximum surface temperature with respect to dust layers above 50 mm.395.3Ambient temperature.396Enclosure materials.416.1Non-metallic enclosures and non-metallic parts of enclosures.416.2Enclosures containing light metals.437Fasteners.437.1Access to live parts.437.2Compatible material.438Interlocking devices.459Bushings.459.1Prevention of turning.459.2Torque tests.4510Materials used for cementing.4510.1Documentation.4510.2Thermal stability.4510.3Verification.4511Ex components.4511.1General.4511.2Mounting.4711.3Internal mounting.4711.4External mounting.4712Connection facilities and terminal compartments.4712.1Attached cables.4712.2Terminal access.4712.3Creepage and clearance.4713Connection facilities for earthing or bonding conductors.4713.1Internal connection.4713.2External connection.4913.3Facility not required.4913.4Effective connection.49
61241-0 © IEC:2004 – 5 – 13.5Effective contact.4913.6Environmental.4913.7Use of light metal.4914Cable and conduit entries.5114.1Intended use.5114.2Construction.5114.3Integral part of the apparatus.5114.4Prevention of twisting.5114.5Method of attaching.5114.6Blanking elements.5114.7Branching point temperatures.5115Radiating equipment.5315.1Lasers and other continuous wave source.5315.2Ultrasonic sources.5516Supplementary requirements for specific electrical apparatus –
Rotating electrical machines.5516.1Ventilation openings for external fans.5516.2Construction and mounting of the ventilating systems.5516.3Clearances for the ventilating system for use in Zone 20 or 21.5516.4Materials for external fans and fanhoods.
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