EN 61241-0:2006

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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.

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with the EN have to be withdrawn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.

- 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

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.

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.

(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)
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)
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.

(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
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
Droits de reproduction réservés
⎯
Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission,
3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, SwitzerlandTelephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch
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.5717Switchgear.5717.1Flammable dielectric.5717.2Interlocking.5717.3Indication of open position.5717.4Openings.5718Fuses.5919Plugs and sockets.5919.1Plugs and sockets construction.5919.2Bolted plugs and sockets.6319.3For Zone 21 and Zone 22.6319.4Plugs remaining energized.6320Luminaires.6320.1Light transmitting covers.6320.2Guards.6320.3Mounting.6320.4Covers.6320.5Parts remaining energized.6520.6Types of lamps.6521Caplights, caplamps and handlamps.6521.1Leakage.6521.2Separate enclosures.6522Apparatus incorporating cells and batteries.6522.1General.6522.2Connection of cells.6522.3Characteristics.6522.4Compatibility.6922.5Limits.6922.6Mixture of cells.69

61241-0 © IEC:2004 – 7 – 22.7Interchangeability.6922.8Re-charging.6922.9Different cells.6922.10Leakage.7122.11Method of connection.7122.12Orientation.7122.13Identification of replacement.7123Verification and tests.7123.1General.7123.2Verification of documents.7123.3Compliance of prototype or sample with documents.7123.4Type tests.7124Routine verifications and tests.8525Manufacturer’s responsibility.8526Verifications and tests on modified or repaired electrical apparatus.8527Clamping tests of cable entries for non-armoured and braided cables.8527.1Cable entries with clamping by the sealing ring.8527.2Cable entries with clamping by filling compound.8727.3Cable entries with clamping by means of a clamping device.8727.4Tensile test.8927.5Mechanical strength.8928Clamping tests of cable entries for armoured cables.9128.1Clamping tests where the armourings are clamped by a device within the gland.9128.2Clamping tests where the armourings are not clamped by a device
within the gland.9129Marking.9129.1General.9129.2Marking of all electrical apparatus.9129.3Multiple protection techniques.9329.4Order of marking.9529.5Reduced marking.9530Examples of marking.9530.1Apparatus type of protection "mD" for use in Zone 20.9530.2Apparatus type of protection "iaD" for use in Zone 20.9530.3Apparatus type of protection "pD" for use in Zone 21.9730.4Apparatus type of protection "tD", Practice A (see IEC 61241-1); temperature tested under 500 mm dust layer, for use in Zone 21.9730.5Apparatus type of protection "tD", Practice B (see IEC 61241-1) for use in Zone 22.9730.6Apparatus type of protection "tD", Practice A (see IEC 61241-1) for use in Zone 22.97Bibliography.99

61241-0 © IEC:2004 – 9 – Figure 1 – Illustration of entry points and branching points.53Figure 2 – Tolerances and clearance for threaded fasteners.61Figure 3 – Contact surface under head of fastener with a reduced shank.61Figure 4 – Test piece with painted electrodes.83Table 1 – Ambient temperatures in service and additional marking.39Table 2 – Minimum cross-sectional areas of protective conductors.49Table 3 – Primary cells.67Table 4 — Secondary cells.69Table 5 – Tests of resistance to impact.73Table 6 – Torque to be applied to the stem of bushing used for connection facilities.77

61241-0 © IEC:2004 – 11 – INTERNATIONAL ELECTROTECHNICAL COMMISSION ___________ELECTRICAL APPARATUS FOR USE IN THE PRESENCE OF COMBUSTIBLE DUST – Part 0: General requirements FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) andexpenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61241-0 has been prepared by subcommittee 31H: Apparatus for use in the presence of combustible dust, of IEC technical committee 31: Electrical apparatus for explosive atmospheres. This first edition of IEC 61241-0, together with IEC 61241-1, cancels and replaces IEC 61241-1-1 (1999) and constitutes a technical revision. 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 IEC 60079 series of standards, where possible.

61241-0  IEC:2004 – 13 – The text of this standard is based on the following documents:
FDIS Report on voting 31H/173/FDIS 31H/178/RVD
Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. IEC 61241 consists of the following parts under the general title: Electrical apparatus for use in the presence of combustible dust: Part 0:
General requirements Part 1:
Protection by enclosures ‘tD’ Part 2: Type of protection ‘pD’ Part 10:
Classification of areas where combustible dusts are or may be present Part 11:
Protection by intrinsic safety ‘iD’ 1 Part 14:
Selection and installation
Part 17:
Inspection and maintenance of electrical installations in hazardous areas (other than mines) 2 Part 18:
Protection by encapsulation ‘mD’
Part 20 3:
Test methods Part 20-1:
Methods for determining the minimum ignition temperatures of dust Part 20-2:
Method for determining the electrical resistivity of dust in layers
Part 20-3:
Method for determining minimum ignition energy of dust/air mixtures
NOTE All references in this standard to the IEC 61241 series follows the proposed re-numbering of the dust standards agreed by SC31H and TC31. It may be necessary to alter these numbers if the relevant standards are not yet published. The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to the specific publication. At this date, the publication
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