1、BSI Standards Publication SPD application in conjunction with Class II equipment PD CLC/TR 50656:2016National foreword This Published Document is the UK implementation of CLC/TR 50656:2016. The UK participation in its preparation was entrusted by Technical Committee PEL/37, Surge Arresters - High Vo
2、ltage, to Subcommittee PEL/37/1, Surge Arresters - Low Voltage. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applicatio
3、n. The British Standards Institution 2016. Published by BSI Standards Limited 2016 ISBN 978 0 580 91543 7 ICS 29.120.50 Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Com
4、mittee on 31 March 2016. Amendments/corrigenda issued since publication Date Text affected PUBLISHED DOCUMENT PD CLC/TR 50656:2016 TECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CLC/TR 50656 March 2016 ICS 29.120.50 English Version SPD application in conjunction with Class II equipment Paraf
5、oudres destins tre utiliss avec des quipements classe II SPD Anwendungen in Verbindung mit Schutzklasse II This Technical Report was approved by CENELEC on 2015-12-14. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Den
6、mark, 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 Kingdom. European
7、Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for
8、 CENELEC Members. Ref. No. CLC/TR 50656:2016 E PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 2 Contents Page European foreword 3 Introduction 4 1 Scope . 5 2 Normative references . 5 3 Terms and definitions 5 3.1 SPD assembly one SPD or a set of SPDs, in both case including all SPD disconnectors require
9、d by the SPD manufacturer, providing the required overvoltage protection for a type of system earthing . 5 3.2 extraneous conductive part conductive part not forming part of the electrical installation and liable to introduce an electric potential, generally the electric potential of a local earth 5
10、 3.3 functional earth . 5 3.4 class II SPD 6 3.5 protective earthing 6 3.6 protective conductor 6 3.7 protective earthing conductor . 6 4 SPDs connected to PE for the protection of Class II equipments . 6 4.1 General . 6 4.2 TN System . 8 4.3 TT System 9 4.4 IT System . 10 4.5 Example of lighting po
11、le surge protection connected to PE . 11 5 SPDs not connected to PE for the protection of Class II equipments 11 5.1 General . 11 5.2 Examples . 12 6 Additional requirements for SPDs to comply with equipment class II design rules (Double or reinforced insulation) 14 6.1 General . 14 6.2 Requirements
12、 for basic protection (protection against direct contact) and fault protection (protection against indirect contact) 15 6.2.1 Class II SPD . 15 6.2.2 Enclosures . 16 Annex A (normative) Test to establish whether a conductive part may cause an electric shock 18 PD CLC/TR 50656:2016CLC/TR 50656:2016 (
13、E) 3 European foreword This document (CLC/TR 50656:2016) has been prepared by CLC/TC 37A “Low voltage surge protective devices”. 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
14、identifying any or all such patent rights. PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 4 Introduction Based on questions and requests from the field it was felt necessary to provide some guidance and instructions how and in which applications currently available SPDs according to EN 61643-11 can be co
15、rrectly and safely applied in conjunction with class II equipment and in installations, where the protective measure double or reinforced insulation is applied (see HD 60364-4-41 and EN 61140). In general current SPDs according EN 61643-11 are designed to properly protect wherever: basic insulation
16、is required e.g. between active parts and the protective equipotential bonding system (PE) (the SPD bridges basic insulation in such applications); basic or functional insulation is required e.g. between active parts of different potential (the SPD bridges basic or functional insulation in such appl
17、ications). The requirements currently contained in EN 61643-11 do not cover requirements for SPD applications, where the SPD bridges double or reinforced insulation, like e.g. between primary and secondary side of an isolating transformer (protective separation) or between active parts and touchable
18、 conductive surfaces of class II equipment. There are attempts to develop requirements for such SPDs, but for the time being there is no defined solution. This document refers to HD 60364-4-41 for topics related to installation rules and to EN 62368-1 for some equipments related topics. This documen
19、t specially addresses installation issues related to street lighting. PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 5 1 Scope In addition to CLC/TS 61643-12, this Technical Report describes the principle of erecting SPDs to be connected to 50 Hz a.c. power circuits, rated up to 1 000 V r.m.s. in conjunc
20、tion with Class II equipments. In addition to EN 61643-11, this Technical Report gives specific guidance for SPDs intended to be installed in class II equipments. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable fo
21、r its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 50539-11:2013, Low-voltage surge protective devices - Surge protective devices for specific application including d.c.
22、 - Part 11: Requirements and tests for SPDs in photovoltaic applications EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529) 1EN 60664-1, Insulation coordination for equipment within low-voltage systems Part 1: Principles, requirements and tests (IEC 60664-1) 2EN 60950-1, In
23、formation technology equipment Safety Part 1: General requirements (IEC 60950-1) 3EN 61643-11:2012, Low-voltage surge protective devices Part 11: Surge protective devices connected to low-voltage power systems Requirements and test methods (IEC 61643-11:2011) 4EN 62368-1:2014, Audio/video, informati
24、on and communication technology equipment Part 1: Safety requirements (IEC 62368-1:2014, modified) 5HD 60364 (all parts), Low-voltage electrical installations (IEC 60364, all parts) 63 Terms and definitions For the purposes of this document, the following terms and definitions apply. 1http:/www.cene
25、lec.eu/dyn/www/f?p=104:110:695920932773601:FSP_ORG_ID,FSP_PROJECT,FSP_LANG_ID:125802 5,43747,25 2http:/www.cenelec.eu/dyn/www/f?p=104:110:379108178804401:FSP_ORG_ID,FSP_PROJECT,FSP_LANG_ID:125849 7,50513,25 3http:/www.cenelec.eu/dyn/www/f?p=104:110:1457986987015001:FSP_ORG_ID,FSP_PROJECT,FSP_LANG_ID
26、:12571 89,53711,25 4http:/www.cenelec.eu/dyn/www/f?p=104:110:592568428155801:FSP_ORG_ID,FSP_PROJECT,FSP_LANG_ID:125861 7,43963,25 5http:/www.cenelec.eu/dyn/www/f?p=104:110:785888442943801:FSP_ORG_ID,FSP_PROJECT,FSP_LANG_ID:125718 9,60205,25 6http:/www.cenelec.eu/dyn/www/f?p=104:110:437816408653901:F
27、SP_ORG_ID,FSP_PROJECT,FSP_LANG_ID:125716 3,57623,25 PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 6 3.1 SPD assembly one SPD or a set of SPDs, in both case including all SPD disconnectors required by the SPD manufacturer, providing the required overvoltage protection for a type of system earthing SOURCE
28、: IEC 60364-5-53, modified 3.2 extraneous conductive part conductive part not forming part of the electrical installation and liable to introduce an electric potential, generally the electric potential of a local earth SOURCE: IEC 60050-826 3.3 functional earth earthing a point or points in a system
29、 or in an installation or in equipment, for purposes other than electrical safety SOURCE: EN 62368-1:2014 53.4 class II SPD SPDs in which protection against electric shock does not rely on basic insulation only, but in which additional safety precautions such as double insulation or reinforced insul
30、ation are provided, there being no provision for protective earthing or reliance upon installation conditions Note 1 to entry: Such a SPD may have a substantially continuous enclosure of metal, insulated from live parts by insulation at least equivalent to double or reinforced insulation. Such a SPD
31、 is called a metal-encased class II SPD. Note 2 to entry: The enclosure of an insulation-encased class II SPD may form a part or the whole of the supplementary insulation or the reinforced insulation. Note 3 to entry: If a SPD with double insulation and/or reinforced insulation throughout has a prot
32、ective earthing, it is class I construction, Note 4 to entry: Class II SPD may have parts in which protection against electric shock relies on operation at safety extra-low voltage (SELV). Note 5 to entry: Such SPDs should be marked with the symbol . SOURCE: EN 60598-1:2015, modified 73.5 protective
33、 earthing earthing a point or points in a system or in an installation or in equipment for purposes of electrical safety SOURCE: EN 62368-1:2014, modified 53.6 protective conductor conductor provided for the purposes of safety (for example, protection against electric shock) 7http:/www.cenelec.eu/dy
34、n/www/f?p=104:110:1827578021514001:FSP_ORG_ID,FSP_PROJECT,FSP_LA NG_ID:1257233,50934,25 PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 7 Note 1 to entry: A protective conductor is either a protective earthing conductor or a protective bonding conductor. SOURCE: EN 62368-1:2014 53.7 protective earthing co
35、nductor protective conductor connecting a main protective earthing terminal in the equipment to an earth point in the building installation for protective earthing SOURCE: EN 62368-1:2014 54 SPDs connected to PE for the protection of Class II equipments 4.1 General In the four following examples, a
36、Class II equipment is integrated into a conductive metallic housing that is connected to PE (i.e. Class I equipment), whereby the protective measures according to HD 60364-4- 41:2007, Clause 411 are effective. The three first following examples describe the recommended location and protection measur
37、es against electric shock for SPD assembly used to protect Class II equipment connected to TN, TT and IT power systems. The forth example is dedicated to special application: metallic street lighting pole. The SPD used in such installation shall comply with EN 61643-11. The installation rules descri
38、bed in HD 60364-5-534 shall be applied, and in addition the rules related to surge protection described in CLC/TS 61643-12 are applicable. A dedicated conductor between the PE and SPD fulfilling the HD 60364-4-41:2007, 411.3.1.1 measures against electric shock is required. Alternatively, the metal c
39、onductive housing itself enclosing the SPD and the Class II equipment, may be used as protective conductors if they simultaneously satisfy the following three requirements: a) their electrical continuity should be ensured by construction or by suitable connection so as to ensure protection against m
40、echanical, chemical or electrochemical deterioration; b) they comply with the requirement of minimum cross section area according to HD 60364-5-54:2011, 543.1 c) they should permit the connection of other protective conductors at every predetermined tap off point. Additional requirements are given i
41、n HD 60364-5-54:2011, 543.2 and 543.3. Nevertheless, an additional functional bounding connection as short as possible can be used to ensure a better surge protection provided by the SPD. In the following pictures, the overcurrent protection is only shown if it is required as protective measure agai
42、nst electrical shock. PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 8 4.2 TN System Key T transformer P protection measures against electric shock (i.e. Fuse or Breaker). Automatic disconnection according to HD 60364-4- 41:2007, 411.4 1 class II equipment 2 conductive housing 3 direct connection to PE F
43、igure 1 Example of SPDs connected to PE protecting Class II equipments in TN System L N PE P 3 1 2 T PEN SPD Assembly PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 9 4.3 TT System Key T transformer P protection measures against electric shock. (i.e. RCD) Automatic disconnection according to HD 60364-4-4
44、1:2007, 411.5 1 class II equipment 2 conductive housing 3 direct connection to PE Figure 2 Example of SPDs connected to PE protecting Class II equipments in TT System L N PE P 3 1 2 x x T SPD Assembly PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 10 4.4 IT System Key T transformer Z high Impedance IMD i
45、nsulation Monitoring Device 1 class II equipment 2 conductive housing 3 direct connection to PE Figure 3 Example of SPDs connected to PE protecting Class II equipments in IT System L N PE 3 1 2 T Z + IMD SPD Assembly PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 11 4.5 Example of lighting pole surge pro
46、tection connected to PE Key 1 SPD 2 Junction box 3 Class II head light (may have a metallic outer surface) 4 Conductive housing (a: not fulfilling and b: fulfilling the PE requirements) 5 Protection measures against electric shock depending on system (See 4.2 and 4.3) Figure 4 Example of SPDs connec
47、ted to PE protecting Class II head luminary The SPD can be located in connection volume of the Class II head light where double or reinforced insulation is achieved between the SPD and the light head. 5 SPDs not connected to PE for the protection of Class II equipments 5.1 General The SPD used in su
48、ch installation shall comply with EN 61643-11 and in addition should fulfill the requirements from Clause 6 if the SPD itself is not part of the class II equipment. The installation rules described in HD 60364-5-534 shall be applied, and in addition the rules related to surge protection described in
49、 CLC/TS 61643-12 are applicable. PD CLC/TR 50656:2016CLC/TR 50656:2016 (E) 12 5.2 Examples Key T transformer 1 class II equipment including cable according to HD 60364-4-41:2007, Clause 412. No additional protective measure against electric shock 2 conductive housing may be unintentionally earthed (not a part of class II) NOTE In this figure, the SPD is mounted into a separate Class II enclosure or provides itself a housing that complies with Class II requirements. Figure 5 Example of SPDs to be installed
