EN 50156-1-2015 en Electrical equipment for furnaces and ancillary equipment - Part 1 Requirements for application design and installation.pdf

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1、BSI Standards PublicationBS EN 50156-1:2015Electrical equipment forfurnaces and ancillaryequipmentPart 1: Requirements for application designand installationBS EN 50156-1:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 50156-1:2015.It supersedes BS EN 50156

2、-1:2004 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PEL/27, Electroheating.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a

3、 contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 78403 3ICS 27.060.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the

4、authority of theStandards Policy and Strategy Committee on 31 July 2015.Amendments issued since publicationDate Text affectedBS EN 50156-1:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50156-1 July 2015 ICS 27.060.01 Supersedes EN 50156-1:2004 English Version Electrical equipment for furn

5、aces and ancillary equipment - Part 1: Requirements for application design and installation Equipements lectriques dinstallation de chaudire - Partie 1: Rgles pour la conception, pour lapplication et linstallation Elektrische Ausrstung von Feuerungsanlagen und zugehrige Einrichtungen - Teil 1: Besti

6、mmungen fr die Anwendungsplanung und Errichtung This European Standard was approved by CENELEC on 2015-01-26. 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 a

7、lteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other langu

8、age made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the

9、Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United

10、 Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means res

11、erved worldwide for CENELEC Members. Ref. No. EN 50156-1:2015 E BS EN 50156-1:2015EN 50156-1:2015 (E) 2 Contents European foreword . 6 Introduction 7 1 Scope 9 2 Normative references . 10 3 Terms and definitions . 11 4 General requirements 19 4.1 General considerations . 19 4.2 Environmental require

12、ments . 20 4.2.1 General . 20 4.2.2 Environmental and operating conditions 20 4.2.3 Electromagnetic compatibility 20 4.2.4 Ambient temperature . 21 4.2.5 Humidity 21 4.2.6 Contamination . 22 4.2.7 Vibration and shock. 22 4.2.8 Equipment used in flammable atmospheres 22 4.3 Power supply 22 4.3.1 Gene

13、ral . 22 4.3.2 Power stations 22 5 Incoming supply connections and devices for disconnecting and emergency stop 22 5.1 Incoming supply and equipment connections 22 5.1.1 Types of connection 22 5.1.2 Terminations . 23 5.2 Devices for disconnecting power supplies . 24 5.2.1 General . 24 5.2.2 Disconne

14、cting switch . 25 5.2.3 Excluded circuits . 25 5.3 Emergency stop 26 5.3.1 General . 26 5.3.2 Emergency stop device for furnaces in heating installations 26 5.3.3 Emergency stop device for other furnaces, e.g. steam boilers . 26 5.3.4 Application as isolating switch . 26 6 Protection against electri

15、c shock 26 6.1 Protection against direct contact . 26 6.2 Protection against indirect contact 27 7 Environmental protection of the equipment. 27 7.1 Protection against ingress of solid foreign bodies 27 7.2 Protection against water . 27 8 Equipotential bonding 27 8.1 General . 27 8.2 Equipotential b

16、onding as a protective measure in case of indirect contact . 27 8.3 Equipotential bonding for the purpose of lightning protection 28 8.4 Functional equipotential bonding . 28 BS EN 50156-1:2015EN 50156-1:2015 (E) 3 9 Auxiliary circuits . 29 9.1 Supply to auxiliary circuits 29 9.1.1 Supply from 3-pha

17、se or a.c. systems . 29 9.1.2 Supply from d.c. mains 29 9.1.3 Auxiliary circuits connected between the line conductors 30 9.2 Voltage for auxiliary circuits 30 9.2.1 Operating voltage of auxiliary circuits 30 9.2.2 Preferred nominal voltages . 30 9.3 Connection to the protective conductor . 30 9.4 O

18、vercurrent protection of auxiliary circuits 30 9.4.1 Rating of overcurrent protective devices . 30 9.4.2 Overcurrent protection of auxiliary circuits connected to the protective conductor 31 9.4.3 Overcurrent protection of auxiliary circuit with the middle conductor connected to the protective condu

19、ctor . 31 9.4.4 Overcurrent protection of auxiliary circuits with no electrical connection to the protective conductor 31 9.4.5 Overcurrent protection of control system supply transformers . 31 9.4.6 Rating and setting of overcurrent protection 31 9.5 Measures to prevent danger from short circuits t

20、o exposed conductive parts or earth . 31 9.6 Influence of capacitance and leakage resistance 32 10 Additional requirements for the application of a safety-related system 32 10.1 General safety requirements . 32 10.1.1 Safety lifecycle requirements for a safety-related system 32 10.1.2 Planning 34 10

21、.2 Concept and scope definition 37 10.3 Hazard and risk analysis . 38 10.4 Safety requirements allocation 39 10.5 Design 40 10.5.1 General requirements 40 10.5.2 Design of the safety-related system 41 10.5.3 Measures to avoid faults . 46 10.5.4 Consideration of times 47 10.5.5 Hardware design . 47 1

22、0.5.6 Plant specific application software. 52 10.6 Installation and commissioning . 55 10.7 Safety validation . 55 10.7.1 System integration of hardware and software 55 10.7.2 Fault assessment for the system integration of hardware and software . 56 10.7.3 Type approval . 57 10.7.4 Plant-specific te

23、st 57 10.8 Operation and maintenance 57 10.9 Modification and retrofit 58 10.9.1 General . 58 10.9.2 Measures against unauthorised changes or overriding 58 11 Electrical equipment . 59 11.1 General requirements . 59 BS EN 50156-1:2015EN 50156-1:2015 (E) 4 11.2 Creepage distances and clearances 59 11

24、.3 Motors 59 11.4 Transformers 59 11.5 Switching devices . 60 11.6 Operator control devices . 60 11.7 Immersion electrodes 60 11.8 Trace heating systems 60 12 Cables and cords . 60 12.1 General requirements . 60 12.2 Insulation 61 12.3 Current-carrying capacity 61 12.4 Conductors of separate circuit

25、s . 61 13 Warning signs and item designation . 62 13.1 Warning signs . 62 13.2 Functional identification 62 13.3 Item designations 62 14 Technical documentation . 62 14.1 General . 62 14.2 Documentation describing functions and connections . 63 14.2.1 General . 63 14.2.2 Documentation describing fun

26、ctions 63 14.2.3 Documentation describing connections . 63 14.2.4 Documentation describing the process 63 14.2.5 Documentation of the risk assessment 63 14.3 Documents for type approved components 64 14.4 Documentation of the application software 64 Annex A (informative) Configurations of programmab

27、le safety devices (PSD) with reference to EN 61508 . 65 A.1 Configuration 1oo1 . 66 A.2 Configuration 1oo1D 66 A.3 Configuration 1oo2 . 67 A.4 Configuration 1oo2D 68 A.5 Configuration 2oo3 . 69 A.6 Configuration 2oo3D 70 Annex B (informative) Lifecycle of programmable safety device 72 Annex C (infor

28、mative) Management of functional safety . 73 Annex D (informative) Examples of determining the safety integrity level SIL using the risk graph method . 74 D.1 General 74 D.2 Risk parameter C (Consequences of the hazardous event) 74 D.3 Risk parameter F (Frequence and duration of the time spent in th

29、e hazard area) . 74 D.4 Risk parameter P (Possibility of preventing the hazardous event) 74 D.5 Risk parameter W (Likelihood of occurrence of the hazardous event) . 74 Bibliography . 76 BS EN 50156-1:2015EN 50156-1:2015 (E) 5 Figure 1 Example of the functionality of a furnace with ancillary equipmen

30、t, heated systems and relationship to control system and safety related system . 8 Figure 2 Types of faults to be considered 14 Figure 3 Causes of faults to be considered 14 Figure 4 Definition and components of a safety-related system . 17 Figure 5 Software 18 Figure 6 Example of power supply, swit

31、ching, isolating devices and other electrical components of a furnace 24 Figure 7 Supply from two d.c. sources . 29 Figure 8 Safety lifecycle model for application, design and installation of a safety-related system (Clause 10) . 33 Figure 9 Rating of safety integrity levels for furnaces 39 Figure 1

32、0 Choice of design principals 41 Figure 11 Fault assessment for the hard-wired section of a safety-related system . 42 Figure 12 Proof of safety against failures and malfunctions of the programmable safety device of the safety-related system 43 Figure 13 Proof of safety of software . 44 Figure 14 Co

33、nsideration of fault tolerance time and safety time for furnaces . 47 Figure 15 Examples for wiring of fuel shut down with hardware diversity of the disconnecting devices 48 Figure 16 Example for wiring of fuel shut down with diverse functionality of the disconnecting devices 49 Figure A.1 - Explana

34、tion of symbols . 65 Figure A.2 66 Figure A.3 67 Figure A.4 68 Figure A.5 69 Figure A.6 70 Figure A.7 71 Figure B.1 72 Table 1 Consideration of different field equipment (sensors and actuating elements) configurations if subsystems or devices are used based on product standards without data in accor

35、dance with EN 61508 or only based on the fault assessment in accordance on the Figures 11, 12 or 13 45 Table 2 Allocation of fault exclusions to safety integrity levels . 50 Table A.1 . 66 Table A.2 . 67 Table A.3 . 68 Table A.4 . 69 Table A.5 . 70 Table A.6 . 71 BS EN 50156-1:2015EN 50156-1:2015 (E

36、) 6 European foreword This document (EN 50156-1:2015) has been prepared by CLC/BTTF 132-2 “Revision of EN 50156 “Electrical equipment for furnaces and ancillary equipment” in cooperation with the National Committee DKE/K 232. The following dates are fixed: latest date by which this document has to b

37、e implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-01-26 latest date by which the national standards conflicting with this document have to be withdrawn (dow) 2018-01-26 This document supersedes EN 50156-1:2004. EN 50156-1:2015 includes the

38、following significant technical changes with respect to EN 50156-1:2004: harmonization of the definitions to the new version of EN 61508; check and updating of the normative references; elimination of all normative references to the machinery directive 2006/42/EC; alignment to the requirements for s

39、afety related system to EN 12952 and EN 12953; modifications in Clause 10. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. This standa

40、rd covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC). Requirements of this standard covers the essential safety requirements for limiting devices in the scope of this standard which are safety accessories

41、 in the sense of pressure equipment directive 97/23/EG, which are classified in the category II and higher. This standard is the first part of a series of European standards which specify the requirements for equipment of safety functions for furnaces, especially safety related system to protect per

42、sonnel, the furnace with ancillary equipment against hazards related to heat generation, the heated system and to operate reliably during normal conditions, and abnormal conditions which can be foreseen. This European Standard has been prepared by the German National Committee with the participation

43、 of experts of other National Committees on the basis of CLC/BT(DE/NOT)140. It is divided into 3 parts under the generic title “Electrical equipment for furnaces and ancillary equipment”: Part 1: Requirements for application design and installation; Part 2: Requirements for design, development and t

44、ype approval of safety-relevant equipment; Part 3: Requirements for plant-specific tests of safety-relevant equipment. This European Standard is based on the EN 61508:2010 “Functional safety of electrical/electronic/programmable electronic safety-related systems”, Parts 1 to 7 as a basic safety stan

45、dard. BS EN 50156-1:2015EN 50156-1:2015 (E) 7 Introduction This part of the European Standard EN 50156 specifies the requirements and recommendations for the application design and installation of electrical and control equipment for furnaces and ancillary equipment and for the systems heated by the

46、 thermal energy released in the furnace to ensure: safety of personnel, property and the environment; consistency of proper function. The operating conditions of the furnace, the hazards of combustion and the safety of heated systems are considered. A safety-related system consisting of safety devic

47、es for: monitoring of flames and other safety conditions of the firing; interrupting the flow of fuel to the furnace; ventilating the body of the furnace and the flue gas ducts; monitoring of the safety condition of the heated systems (e.g. water level limiter in steam boilers); may be necessary to

48、ensure proper ignition and combustion of fuel and to avoid the development, existence and/or ignition of an explosive mixture of fuel and air, and also to avoid damage to the heated systems (see 3.25). The rating of necessary safety integrity levels is based on EN 61508-1. Figure 1 is provided as an

49、 aid to understanding the relationship between the various elements of furnaces and their ancillary equipment, the heated systems, the control system and the safety-related systems. BS EN 50156-1:2015EN 50156-1:2015 (E) 8 Figure 1 Example of the functionality of a furnace with ancillary equipment, heated systems and relationship to control system and safety related system BS EN 50156-1:2015EN 50156-1:2015 (E) 9 1 Scope This European Standard applies to the application design and installation of electr