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 BS EN 50394-1:2004 This British Standard was pub
2、lished 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 language version of EN 50394-1:2004. The UK participation in its preparation was entrusted by Technical Committe
3、e 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 on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards whic
4、h 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 by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publicat
5、ion 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 immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/
6、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 them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page
7、, 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 Amd. No. Date CommentsEUROPEAN STANDARD EN 50394-1 NORME EUROPENNE EUROPISCHE NORM March 2004 CENELEC European
8、Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique 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 CEN
9、ELEC members. Ref. No. EN 50394-1:2004 E ICS 29.260.20 English version Electrical apparatus 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: Cons
10、truction et essais Elektrische Betriebsmittel fr explosionsgefhrdete Bereiche Gruppe 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
11、 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
12、 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 electro
13、technical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 5
14、0394-1:2004 - 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 was submitted to the Uni
15、que 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 date by which the natio
16、nal 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 equipment in support of the
17、essential safety and health requirements described in the European Directive 94/9/EC “Equipment and protective systems intended for use in potentially explosive atmospheres“. - 3 - EN 50394-1:2004 Contents Introduction.4 1 Scope.5 2 Normative references5 3 Definitions5 4 Categories of intrinsically
18、safe electrical systems (in accordance with EN 50014) 7 5 Interconnecting wiring/cables used in an intrinsically safe electrical system .7 6 Accessories for intrinsically safe electrical systems .8 7 Type tests and assessment.8 8 Marking of intrinsically safe electrical systems.10 9 Descriptive syst
19、em document11 10 Instructions.11 Annex A (normative) Requirements for cables .12 Annex B (informative) Typical descriptive system drawing1 Annex C (normative) Assessment of a simple intrinsically safe system.14 Annex D (normative) Assessment of circuits with more than one linear source of power.16 A
20、nnex E (normative) Trapezoidal power supplies.19 Annex F (normative) Non-linear power supplies.20 Annex G (normative) Verification of inductive parameters 21 EN 50394-1:2004 - 4 - Introduction When the European Directive 94/9/EC came into force on 1 March 1996, the requirements relating to intrinsic
21、ally safe electrical systems were identified as requiring revision. 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
22、 in Article 1(3a), or components, as defined in Article 1(3c) and 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, t
23、o be considered as equipment or components; c) in case an intrinsically 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 co
24、nformity assessment procedure of the directive; d) the resulting 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 syste
25、ms, which have to be applied. In this context the use of EN 50039 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 t
26、he mining industry document dealing with the construction and testing of Group I intrinsically safe systems. - 5 - EN 50394-1:2004 1 Scope 1.1 This European Standard contains the requirements for construction and testing of Group I intrinsically safe electrical systems intended for use, as a whole o
27、r 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 market by a manufacturer or their authorised rep
28、resentative, 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 manufacturer and needs to follow the conformity asse
29、ssment 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 National Regulations may impose additional requi
30、rements 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. For undated references, the latest edition o
31、f 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 safety i EN 50303 Group I Category M1 equipment i
32、ntended 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 50303. 3.1 intrinsically safe electrical system
33、 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 intrinsically safe electrical system a complete syst
34、em placed on the market, conforming with 3.1 which has undergone the relevant conformity assessment procedures and complies with the requirements of this standard EN 50394-1:2004 - 6 - 3.3 user constructed intrinsically safe electrical system a system conforming with 3.1 and assembled by the user co
35、mprising products separately conforming to EN 50020 (which may consist of associated apparatus, intrinsically safe apparatus and/or simple apparatus and interconnecting wiring supplied from one or more linear power supplies or a power supply with trapezoidal/non-linear output characteristic) for whi
36、ch an assessment report has been issued confirming that the complete electrical system complies with this standard 3.4 descriptive system document a document prepared by the system designer in which the items of electrical apparatus, their electrical parameters and the parameters for the interconnec
37、ting wiring are specified NOTE The term “system designer” is intended to describe the person, who is responsible for the intrinsic safety of the system. 3.5 equipment Group I category M1 in accordance with EN 50014 equipment designed and, where necessary, equipped with additional special means to be
38、 capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a very 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 endangered by
39、 firedamp and/or combustible dust. Equipment in this category is intended to remain functional, even in the event of rare incidents relating to equipment, 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 pr
40、otection, at least an independent second means provides the requisite level of protection, or b) the requisite level of protection is assured in the 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
41、. 3.6 equipment Group I category M2 in accordance with EN 50014 equipment designed to be capable of functioning in conformity with the operational parameters established by the manufacturer and ensuring a high level of protection. Equipment in this category is intended for use in underground parts o
42、f 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 intended to be de- energised in the event of an explosive atmosphere. The means of protection relating to equipment in this category assure the requisi
43、te level of protection during normal operation and also in the case of more severe operating conditions, in particular those arising from rough handling 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 pass
44、ive components such as terminal boxes, junction boxes, plugs, sockets, and switches 3.8 linear power supply a power source from which the available output current is determined by a resistor. The output voltage decreases linearly as the output current increases 3.9 power supply with trapezoidal outp
45、ut characteristics a power source from which the available output current is determined by a resistor. The output voltage is controlled by the addition of a zener diode clamp on the output terminals (see Annex E for more detail) - 7 - EN 50394-1:2004 3.10 non-linear power supply a power source where
46、 the output voltage and output current have 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 (C c ) maximum capacitance of the interconnecting cable that can be connected into an in
47、trinsically safe circuit without invalidating intrinsic safety 3.12 maximum cable inductance (L c ) maximum inductance of the interconnecting cable that can be connected into an intrinsically safe circuit without invalidating intrinsic safety 3.13 maximum cable inductance to resistance ratio (L c /R
48、 c ) maximum value of the ratio inductance (L c ) to resistance (R c ) of the interconnecting cable that can be connected into an intrinsically safe circuit without invalidating intrinsic safety 4 Categories of intrinsically safe electrical systems (in accordance with EN 50014) Each part of an intri
49、nsically safe electrical system shall meet the requirements for either category M1 or M2, depending upon whether it is intended for operation in an explosive atmosphere or a potentially explosive atmosphere respectively. The complete system need not necessarily be in an single category, providing it is clear which parts relate to which category as outlined in 4.1 and 4.2 below. NOTE Intrinsically safe systems, or parts thereof, may have different categories to those of th
