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1、BRITISH STANDARD BS EN 50394-1:2004 Electrical apparatus for potentially explosive atmospheres Group I Intrinsically safe systems Part 1: Construction and testing The European Standard EN 50394-1:2004 has the status of a British Standard ICS 29.260.20 ? Licensed Copy: sheffieldun sheffieldun, na, Mo
2、n Nov 06 07:28:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 50394-1:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 10 May 2004 BSI 10 May 2004 ISBN 0 580 43720 5 National foreword This British Standard is the official English lan
3、guage version of EN 50394-1:2004. The UK participation in its preparation was entrusted by Technical Committee GEL/31, Electrical apparatus for use in explosive atmospheres, to Subcommittee GEL/31/13, Intrinsically safe apparatus, which has the responsibility to: A list of organizations represented
4、on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or
5、 by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer imm
6、unity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate the
7、m in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 22, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Am
8、d. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:28:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 50394-1 NORME EUROPENNE EUROPISCHE NORM March 2004 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electr
9、otechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50394-1:2004 E ICS 29.260.20 English version Electrical ap
10、paratus for potentially explosive atmospheres Group I Intrinsically safe systems Part 1: Construction and testing Matriels lectriques pour atmosphres explosibles Systme de scurit intrinsque du groupe I Partie 1: Construction et essais Elektrische Betriebsmittel fr explosionsgefhrdete Bereiche Gruppe
11、 I: Eigensichere Systeme Teil 1: Konstruktion und Prfung This European Standard was approved by CENELEC on 2003-10-01. 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 with
12、out 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 langua
13、ge 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, Czech Republic, Denmark, Estonia,
14、Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:28:45 GMT+00:00 2006, Uncontro
15、lled Copy, (c) BSI EN 50394-1:2004 - 2 - Foreword This European Standard was prepared jointly by a mining working group, convened under SC 31-3, Intrinsically safe apparatus and systems “i“, of Technical Committee CENELEC TC 31, Electrical apparatus for explosive atmospheres. The text of the draft w
16、as submitted to the Unique Acceptance Procedure and was approved by CENELEC as EN 50394-1 on 2003-10-01. 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) 2004-10-01 - latest
17、date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-10-01 This European Standard was prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association to set down requirements for the design and construction of equip
18、ment in support of the essential safety and health requirements described in the European Directive 94/9/EC “Equipment and protective systems intended for use in potentially explosive atmospheres“. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:28:45 GMT+00:00 2006, Uncontrolled Copy, (c)
19、 BSI - 3 - EN 50394-1:2004 Contents Introduction.4 1 Scope.5 2 Normative references5 3 Definitions 5 4 Categories of intrinsically safe electrical systems (in accordance with EN 50014) 7 5 Interconnecting wiring/cables used in an intrinsically safe electrical system .7 6 Accessories for intrinsicall
20、y safe electrical systems.8 7 Type tests and assessment.8 8 Marking of intrinsically safe electrical systems.10 9 Descriptive system document11 10 Instructions.11 Annex A (normative) Requirements for cables .12 Annex B (informative) Typical descriptive system drawing1 Annex C (normative) Assessment
21、of a simple intrinsically safe system.14 Annex D (normative) Assessment of circuits with more than one linear source of power.16 Annex E (normative) Trapezoidal power supplies.19 Annex F (normative) Non-linear power supplies.20 Annex G (normative) Verification of inductive parameters 21 Licensed Cop
22、y: sheffieldun sheffieldun, na, Mon Nov 06 07:28:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 50394-1:2004 - 4 - Introduction When the European Directive 94/9/EC came into force on 1 March 1996, the requirements relating to intrinsically safe electrical systems were identified as requiring revis
23、ion. The EU Commission issued the following interpretation, following a request from CENELEC TC 31: “a) intrinsically safe systems are not protective systems as defined in Article 1(3b) of the directive. They can be equipment, as defined in Article 1(3a), or components, as defined in Article 1(3c) a
24、nd are in such cases within the scope of the directive; b) intrinsically safe systems have to undergo the relevant conformity assessment procedures of the directive, if they are placed on the market as a complete system and, therefore, to be considered as equipment or components; c) in case an intri
25、nsically safe system comprises several separate products, which are designed to be assembled by the user, each single product, which is within the scope of the directive and placed on the market separately, has to undergo the relevant conformity assessment procedure of the directive; d) the resultin
26、g system has to be seen as an installation and it is, as such, not subject to the procedures and requirements of the directive. This does not exclude that there might be national regulations related to the use of intrinsically safe systems, which have to be applied. In this context the use of EN 500
27、39 could be useful.” As a result of the above interpretation, CENELEC SC 31-3 decided to produce a revised version of EN 50039 with separate parts for mining (Group I) and non-mining industries (Group II). Accordingly, this standard is the mining industry document dealing with the construction and t
28、esting of Group I intrinsically safe systems. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:28:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI - 5 - EN 50394-1:2004 1 Scope 1.1 This European Standard contains the requirements for construction and testing of Group I intrinsically safe elect
29、rical systems intended for use, as a whole or in part, in atmospheres susceptible to firedamp. 1.2 This European Standard supplements EN 50020, the requirements of which apply to electrical apparatus used in intrinsically safe electrical systems. It is intended to apply to systems placed on the mark
30、et by a manufacturer or their authorised representative, or systems assembled by the user, using products separately conforming with EN 50020. NOTE If the user intends to assemble a system using a product not conforming with EN 50020, then the user assumes the responsibilities of the system manufact
31、urer and needs to follow the conformity assessment procedure. 1.3 This European Standard does not deal with the selection of suitable equipment, or the installation of intrinsically safe electrical apparatus, associated electrical apparatus, to form an intrinsically safe electrical system. NOTE Nati
32、onal Regulations may impose additional requirements for the selection, installation and use of intrinsically safe systems in mines. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies.
33、For undated references, the latest edition of the referenced document (including any amendments) applies. Publication Title EN 50014 Electrical apparatus for potentially explosive atmospheres - General requirements EN 50020 Electrical apparatus for potentially explosive atmospheres - Intrinsic safet
34、y i EN 50303 Group I Category M1 equipment intended to remain functional in atmospheres endangered by firedamp and/or coal dust 3 Definitions For the purpose of this European Standard, the following definitions apply. They supplement the definitions, which are given in EN 50014, EN 50020, and EN 503
35、03. 3.1 intrinsically safe electrical system interconnected items of electrical apparatus, described in a descriptive system document, in which the circuits or parts of circuits intended to be used in potentially explosive atmospheres, are intrinsically safe circuits 3.2 conformity-assessed intrinsi
36、cally safe electrical system a complete system placed on the market, conforming with 3.1 which has undergone the relevant conformity assessment procedures and complies with the requirements of this standard Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:28:45 GMT+00:00 2006, Uncontrolled
37、Copy, (c) BSI EN 50394-1:2004 - 6 - 3.3 user constructed intrinsically safe electrical system a system conforming with 3.1 and assembled by the user comprising products separately conforming to EN 50020 (which may consist of associated apparatus, intrinsically safe apparatus and/or simple apparatus
38、and interconnecting wiring supplied from one or more linear power supplies or a power supply with trapezoidal/non-linear output characteristic) for which an assessment report has been issued confirming that the complete electrical system complies with this standard 3.4 descriptive system document a
39、document prepared by the system designer in which the items of electrical apparatus, their electrical parameters and the parameters for the interconnecting wiring are specified NOTE The term “system designer” is intended to describe the person, who is responsible for the intrinsic safety of the syst
40、em. 3.5 equipment Group I category M1 in accordance with EN 50014 equipment designed and, where necessary, equipped with additional special means to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a very high level of protection. E
41、quipment in this category is intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by firedamp and/or combustible dust. Equipment in this category is intended to remain functional, even in the event of rare incidents relating to equip
42、ment, with an explosive atmosphere present, and is characterised by means of protection such that a) either, in the event of failure of one means of protection, at least an independent second means provides the requisite level of protection, or b) the requisite level of protection is assured in the
43、event of two faults occurring independently of each other. NOTE At the present time, only “level of protection ia ”, meets the requirement of (b) above. 3.6 equipment Group I category M2 in accordance with EN 50014 equipment designed to be capable of functioning in conformity with the operational pa
44、rameters established by the manufacturer and ensuring a high level of protection. Equipment in this category is intended for use in underground parts of mines as well as those parts of surface installations of such mines likely to be endangered by firedamp and/or combustible dust. This equipment is
45、intended to be de- energised in the event of an explosive atmosphere. The means of protection relating to equipment in this category assure the requisite level of protection during normal operation and also in the case of more severe operating conditions, in particular those arising from rough handl
46、ing and changing environmental conditions NOTE The definitions in 3.5 and 3.6 above are an extract of the definitions in EN 50014. 3.7 accessories passive components such as terminal boxes, junction boxes, plugs, sockets, and switches 3.8 linear power supply a power source from which the available o
47、utput current is determined by a resistor. The output voltage decreases linearly as the output current increases 3.9 power supply with trapezoidal output characteristics a power source from which the available output current is determined by a resistor. The output voltage is controlled by the additi
48、on of a zener diode clamp on the output terminals (see Annex E for more detail) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 06 07:28:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI - 7 - EN 50394-1:2004 3.10 non-linear power supply a power source where the output voltage and output current hav
49、e a non-linear relationship. For example a supply with a constant voltage output up to constant current limit controlled by semiconductors 3.11 maximum cable capacitance (Cc) maximum capacitance of the interconnecting cable that can be connected into an intrinsically safe circuit without invalidating intrinsic safety 3.12 maximum cable inductance (Lc) maximum inductance of the interconnecting cable that can be connected into an intrinsically safe circuit without inva
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