BS 7071-1992 Specification for portable residual current devices《便携式残余电流装置规范》.pdf

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1、BRITISH STANDARD BS 7071:1992 Specification for Portable residual current devices UDC 621.3.014:621.3.035.223.632:621.3-182.4:001.4:620.1BS7071:1992 This British Standard, having been prepared under the directionof the power Electrical Engineering Standards Policy Committee, was published underthe a

2、uthority of the Standards Board and comes intoeffect on 15September 1992 BSI 07-1999 First published March 1989 Second edition September 1992 The following BSI references relate to the work on this standard: Committee reference PEL 11 Draft for comment 90 32904 DC ISBN 0 580 21068 5 Committees respo

3、nsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Policy Committee (PEL/-) to Technical Committee PEL/11, upon which the following bodies were represented: ASTA Certification Services Association of Control Manufactu

4、rers TACMA (BEAMA Ltd.) British Lawn Mower Manufacturers Federation Consumer Policy Committee of BSI Department of Trade and Industry (Consumer Safety Unit, CA Division) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electricity Supply Industry in England and Wales Electron

5、ic Components Industry Federation Health and Safety Executive Institution of Electrical Engineers National Inspection Council for Electrical Installation Contracting Portable Electric Tool Manufacturers Association Amendments issued since publication Amd. No. Date CommentsBS7071:1992 BSI 07-1999 i C

6、ontents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions and symbols 1 3 Classification 3 4 Rating 3 5 Marking and labelling 3 6 Service conditions 5 7 Design and construction 5 8 Type tests 8 9 Routine tests 19 Appendix A Relevant requirements and tests of standard

7、s for compatible plugs, adaptors and socket-outlets 20 Appendix B Function of test circuit 20 Appendix C Measurement of creepage distances and clearances 21 Figure 1 Test circuit for earth fault breaking current test 24 Figure 2 Tumbling barrel 25 Figure 3 Typical circuit diagram for a portable rcd

8、26 Figure 4 Test circuit for circuit fault current test 27 Figure 5 Apparatus for flexing test 28 Figure 6 Apparatus for pressure test 29 Figure 7 Ball pressure test apparatus 30 Figure 8 Glow wire with thermocouple 30 Figure 9 Glow wire test apparatus 31 Figure 10 Arrangements and dimensions of the

9、 electrodes for the tracking test 32 Figure 11 Dispositions of portable rcd for testing test circuit operation 32 Table 1 High voltage test values 9 Table 1(a) Limits of temperature rises 10 Table 2 Endurance test sequence 12 Table 3 Torque values for screws and nuts 15 Table 4 Application of glow-w

10、ire test 18 List of references Inside back coverBS7071:1992 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Power Electrical Engineering Standards Policy Committee. It supersedes BS7071:1989, which is withdrawn. This edition introduces technical changes but

11、 it does not reflect a full review or revision of the standard, which will be undertaken in due course. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Stand

12、ard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 32, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpora

13、ted. This will be indicated in the amendment table on theinside front cover.BS7071:1992 BSI 07-1999 1 1 Scope This British Standard specifies requirements for portable residual current devices (portable rcds) (including devices using auxiliary sources and devices with electronic circuitry) for opera

14、tion on an a.c. supply and having a rated voltage not exceeding250 V a.c. single phase, a rated current not exceeding 16 A, a rated frequency not exceeding400 Hz and a rated residual operating current not exceeding 30 mA. Portable rcds incorporate a plug-pin portion and/or socket-outlet portion(s) a

15、nd may include terminals for external flexible cords where appropriate. Portable rcds with an intentional time delay are not covered by this standard. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions and symbols 2.1 Definitions For th

16、e purposes of this British Standard the following definitions apply. 2.1.1 residual current (I % ) the root mean square (r.m.s.) value of the vector resultant of the instantaneous values of the currents flowing in the main circuit of the residual current device 2.1.2 portable residual current device

17、 (portable rcd) a device which incorporates an auxiliary sensing circuit that will automatically disconnect the main circuit at a predetermined value of residual current 2.1.3 interlocked portable rcd a portable rcd incorporating an interlock (either mechanical or electrical) which prevents the cont

18、acts of the portable rcd from being closed on-load 2.1.4 rewireable portable rcd a portable rcd so constructed that a cable or flexible cord can be fitted or replaced using general purpose tools 2.1.5 non-rewireable portable rcd a portable rcd so constructed that it forms a construction unit with th

19、e flexible cord such that the flexible cord cannot be separated from the portable rcd without making it permanently useless, and the portable rcd cannot be opened by hand or by using a general purpose tool, e.g. a screwdriver and/or pliers, without making the portable rcd permanently useless NOTEA p

20、ortable rcd is considered to be permanently useless when, for reassembly of the portable rcd, parts or materials other than the original need to be used. 2.1.6 tripping current (I o , % ) the minimum value of residual current that causes the device to open 2.1.7 rated tripping current (I o,%,N ) (ra

21、ted residual operating current) the value of residual current, assigned by the manufacturer, at which the device opens under specific conditions 2.1.8 rated non-tripping current (I 8,%,N ) the value of residual current, assigned by the manufacturer, at which the device does not open under specified

22、conditions 2.1.9 rated current of a device (I N ) the r.m.s. value of current, assigned by the manufacturer, which the main circuit of the device is capable of carrying continuously under specified conditions of use and behaviour 2.1.10 prospective current the current (r.m.s. value of the a.c. compo

23、nent) that would flow in the circuit due to the applied voltage if each main current path of the device were replaced by a link of negligible impedance but without any other circuit change NOTEFor the purpose of this definition the term “device” includes the short length of cable or cord used to con

24、nect the device to the test circuit. 2.1.11 rated voltage (U N ) the r.m.s. value of voltage, assigned by the manufacturer, to which the performance of the device is referredBS7071:1992 2 BSI 07-1999 2.1.12 pole the portion of a switching device associated exclusively with one electrically separated

25、 conducting path of its main circuit and excluding those portions which provide a means for mounting and operating all poles together NOTEAll the conducting parts of a switching device included in the circuit which it is designed to close or open are considered to be the main circuit. 2.1.13 switche

26、d pole a pole containing contacts for opening and closing the current path 2.1.14 switched neutral a switched pole, in the neutral current path, with contacts not intended to make or break current but arranged to open after and to close before the contacts in any other switched pole of the main curr

27、ent path 2.1.15 main contacts the fixed and moving contacts in the main current carrying paths 2.1.16 test circuit an integral circuit to enable the protective function of the device to be checked 2.1.17 integral auxiliary source an auxiliary source intended to supply the auxiliary circuit(s), which

28、 is derived from the same mains supply within the device as the load being protected 2.1.18 portable rcd with integral overcurrent protection a portable rcd designed to perform the additional function of overload and/or short circuit protection NOTEThis includes a portable rcd with a socket-outlet a

29、nd/or plug-pin portions as an integral part of its construction, which can supply a local load only through either a fused plug or its integral overcurrent protection. 2.1.19 termination a means by which an electrical connection can be made between the appropriate cable or flexible cord and the cond

30、ucting part of the portable rcd using special purpose tools, e.g. soldering, welding and crimping 2.1.20 terminal a means by which the user can make an electrical connection between the appropriate cable or flexible cord and the conducting parts of the portable rcd without the use of special tools 2

31、.1.21 pillar terminal a terminal in which the conductor is inserted into a hole or cavity where it is clamped under the end of the screw or screws or through an intermediate clamping member to which pressure is applied by the end of the screw 2.1.22 screw terminal a terminal in which the conductor i

32、s clamped under the head of the screw, the clamping pressure being applied either directly by the head of the screw or through an intermediate metallic part in direct contact with the screw, such as a washer, clamping plate or antispread device 2.1.23 stud terminal a terminal in which the conductor

33、is clamped under a nut, the clamping pressure being applied either directly by a suitably shaped nut or through an intermediate part, such as a washer, clamping plate or antispread device 2.1.24 rcd adaptor a portable rcd comprising a plug-pin portion and socket-outlet(s) as integral parts of the po

34、rtable rcds construction, the plug-pins being of the same rating and to the same standard as the socket-outlet portion 2.1.25 rcd plug a portable rcd comprising a plug-pin portion and terminals for connection of a flexible cord as integral parts of the rcd plugs construction or with a flexible cord

35、connected 2.1.26 portable rcd socket-outlet a portable rcd comprising socket-outlet(s) portions as integral parts of the device with terminals for connection of a flexible cord or with a flexible cord connectedBS7071:1992 BSI 07-1999 3 2.1.27 in-line portable rcd a portable rcd comprising integral i

36、nput and output flexible cords permanently connected to the rcd to which appropriate plugs, socket connections or appliances can subsequently be connected 2.1.28 functional earth circuit for the purposes of this standard a functional earth circuit is one connected to earth for protection against sup

37、ply faults, suppression and similar functions 2.1.29 accessible external surface of a portable rcd all surfaces which can be touched by test finger 1 of BS3042:1971 when the portable rcd is in normal use or, in the case of a portable rcd with plug pins, when it is in full engagement with a correspon

38、ding socket-outlet 2.2 Symbols For the purposes of this British Standard the following symbols apply: I = current U = voltage qualified by the following subscripts: 3 Classification A portable rcd shall be classified according to the following: a) the type of portable rcd, as follows: 1) portable rc

39、d adaptor; or 2) portable rcd plug; or 3) portable rcd socket-outlet; or 4) in-line portable rcd; b) whether it is rewireable or non-rewireable; c) the number of poles, as follows: 1) single-pole with switched neutral; or 2) double pole; d) the type of switching, as follows: 1) on-load closing; or 2

40、) on-load closing prevented (interlocked portable rcd). 4 Rating A portable rcd shall be rated in terms of the following: a) voltage; b) current; c) frequency; d) tripping current. 5 Marking and labelling 5.1 The portable rcd shall be marked legibly and in a durable manner with the following details

41、: a) the rated voltage (U N ); b) the rated current (I N ); c) the rated tripping current (I o,%,N ); d) the symbol for nature of supply; e) the frequency of supply if other than50Hz; f) the manufacturers or responsible vendors name or distinguishing mark; g) the type reference (which may be a catal

42、ogue number); h) the number and date of this British Standard, i.e. BS7071:1992; i) the details concerning the operation of the test circuit including such words as “Test each time before use”; j) the closed and open positions of the portable rcd; NOTEThe symbols given in 5.4 may be used. k) a diagr

43、am of connections, if a diagram of connections is not separately supplied with the device; l) the words “Supply Fault” adjacent to the reverse polarity indicator, if fitted. The test details in items i), j) and l) shall be visible when the portable rcd is in normal use. All other marking shall be on

44、 the external surface. 5.2 The terminals for the connection of the neutral and line conductors shall be identified by the symbols N and L respectively. Where it is necessary to distinguish between supply and load terminals, they shall be clearly identified by suitable marking. 5.3 Terminals for the

45、connection of protective conductors shall be marked with the symbol for earth. N = rated o = open = non-opening % = residual (out-of-balance) a = auxiliaryBS7071:1992 4 BSI 07-1999 5.4 If symbols are used they shall be as follows: NOTEFor the marking of the rated current and rated voltage of the por

46、table rcd figures may be used alone, the figures for the current rating being placed before or above those for the rated voltage and separated by a line. If a symbol for nature of supply is used, it is placed next to the marking for rated current and rated voltage. Examples are as follows: 5.5 Compl

47、iance with 5.1 to 5.4 shall be checked by inspection and by the tests described in 8.7. 5.6 When a rewireable portable rcd is fitted with a fuse link, the rating of the fuse link shall be indicated, e.g. “Fitted with X ampere fuse” (where X denotes the rating of the fuse link). NOTEThis information

48、may be provided on a removable tag or label or it may be given in accompanying literature or on a card such as a retail blister card, to which the portable rcd is fixed. Compliance shall be checked by inspection. 5.7 Unless supplied direct to a manufacturer for incorporation in other equipment, flex

49、ible cords shall be supplied with a label or instruction indicating the colour coding of the cores of the flexible cords. 5.7.1 A label or instruction provided for the flexible output cord of an rcd plug or an in-line portable rcd shall include the following: “IMPORTANT Output This cable shall be fixed to the device to be protected. The wires in this mains lead are coloured in accordance with the following code: 5.7.2 The label or instruction for the flexible input cord of a portable rcd socket-outlet or an in-line portable rcd shall inc