EN 61241-0:2006
(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. The contents of the corrigendum of November 2005 have been included in this copy.
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)
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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.
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 source
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