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1、BRITISH STANDARD BS 7657:1993 Incorporating Amendment No. 1 Specification for Fuses (cut-outs), ancillary terminal blocks and interconnecting units up to 100 A rating, for power supplies to buildings Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:22:08 GMT+0
2、0:00 2006, Uncontrolled Copy, (c) BSI BS 7657:1993 This British Standard, having been prepared under the direction of the Power Electrical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1993 BSI 02-2000 The following
3、BSI references relate to the work on this standard: Committee reference PEL/10 Draft for comment 92/21883 DC ISBN 0 580 21748 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Policy Committee (PEL/
4、-) to Technical Committee PEL/10, upon which the following bodies were represented: ASTA Certification Services Association of Control Manufacturers TACMA (BEAMA Ltd.) Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd.) British Industrial Truck Association ERA
5、Technology Ltd. Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electricity Association Electronic Components Industry Federation Engineering Equipment and Materials Users Association GAMBICA (BEAMA Ltd.) Health and Safety Executive Institution of Electrical Engineers Amendm
6、ents issued since publication Amd. No.DateComments 9504June 1997Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:22:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7657:1993 BSI 02-2000i Contents Page Committees responsib
7、leInside front cover Forewordiii 1General1 1.1Scope1 1.2Vacant1 1.3References1 2Definitions1 3Classification2 4Characteristics2 4.1General2 4.2Type of equipment2 4.3Rated and limiting values for the main circuits2 5Product information3 5.1Nature of information3 5.2Marking3 5.3Instructions for instal
8、lation, operation and maintenance3 6Normal service and mounting conditions3 6.1Normal service conditions3 6.1.1Ambient air temperature3 6.2Vacant3 6.3Mounting3 6.3.101Type A fuses3 6.3.102Type B fuses, terminal blocks and interconnecting units3 7Constructional and performance requirements3 7.1Constr
9、uctional requirements3 7.1.1Materials3 7.1.2Current carrying parts and their connections4 7.1.2.101 Fuse-carriers4 7.1.2.102 Fuse-bases4 7.1.3Clearances and creepage distances4 7.1.4Vacant4 7.1.5Vacant4 7.1.6Vacant4 7.1.7Terminals4 7.1.7.1Constructional requirements4 7.1.7.2Connecting capacity4 7.1.
10、7.3Connection5 7.1.7.4Terminal identification and marking5 7.1.8Vacant5 7.1.9Vacant5 7.1.10Enclosures for equipment5 7.1.10.1Design5 7.1.11Degrees of protection of enclosed equipment6 7.2Performance requirements6 7.2.1Vacant6 7.2.2Temperature-rise6 7.2.2.101 Long term contact stability6 7.2.2.102 Me
11、chanical endurance6 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:22:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7657:1993 ii BSI 02-2000 Page 7.2.3Dielectric properties6 7.2.101Performance on overload and short circuits6 8Tests7 8.1Kinds of tests7 8.1
12、.1General7 8.1.2Type tests7 8.2Conformity with constructional requirements7 8.2.1Materials7 8.2.1.101 Flammability test7 8.2.2Equipment7 8.2.2.101 Impact test7 8.2.2.102 Mechanical tests on security of sealing lugs7 8.2.3Enclosures for equipment8 8.2.3.101 Degree of protection test8 8.2.4Mechanical
13、properties of terminals10 8.2.4.101 Terminal torque test10 8.3Performance10 8.3.1Test sequences10 8.3.2General test conditions10 8.3.2.1General requirements10 8.3.2.2Test quantities11 8.3.2.3Vacant11 8.3.2.4Test reports11 8.3.3Performance under no load, normal load and overload conditions11 8.3.3.1V
14、acant11 8.3.3.2Vacant11 8.3.3.3Temperature-rise11 8.3.3.4Dielectric properties13 8.3.4Performance under short-circuit conditions for type A and type B fuses14 Annex AA (informative) Guide to the uninterrupted rated current of fuses under various conditions of installation15 Annex BB (normative) Type
15、 test sequence for fuses16 Figure 101 Pillar terminal with direct pressure4 Figure 102 Apparatus for impact test9 Figure 103 Mechanical tests on security sealing lugs10 Table 101 Peak test current7 Table 102 Type tests8 Table 103 Maximum temperature-rise at rated current11 Table 104 Values of overlo
16、ad test current13 Table AA.1 Examples of derating for typical installation methods15 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:22:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7657:1993 BSI 02-2000iii Foreword This
17、 British Standard has been prepared under the direction of the Power Electrical Engineering Standards Policy Committee. It is based on the Electricity Association Technical Specification 12-10, and has been updated to reflect current practice and standards. This standard was originally submitted to
18、CENELEC under the Vilamoura Procedure, but in the absence of interest by other national committees it was derogated to the UK for publication as a national standard. This standard is to be read in conjunction with BS EN 60947-1:1992 and therefore for ease of cross-reference it has clause numbering f
19、ollowing the style of BS EN 60947-1. Subclauses, tables, or figures which are additional to those in BS EN 60947-1 are numbered starting from 101; additional annexes are lettered AA, BB, etc. A British Standard does not purport to include all the necessary provisions of a contract. Users of British
20、Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 16, an inside back cover and a back cover. T
21、his standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:22:08 GMT+00:00 2006, Uncontrolled Copy, (c)
22、BSI iv blank Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:22:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7657:1993 BSI 02-20001 1 General 1.1 Scope This standard specifies the requirements for fuses (cut-outs), ancillary terminal blocks and interconne
23、cting units up to 100 A rating, for the protection of power supplies to buildings. They are suitable for use on single phase, or one phase of a three phase low-voltage public electricity supply system with a maximum voltage up to 440 V a.c. and at a frequency of 50 Hz, the neutral being effectively
24、earthed. The provisions of the general rules dealt with in BS EN 60947-1 are applicable to this standard when specifically called for. NOTEClauses and subclauses, tables, figures and appendices of the general rules thus applicable are identified by reference to BS EN 60947-1, for example 1.2.3 of BS
25、 EN 60947-1, Table IV of BS EN 60947-1, or Appendix A of BS EN 60947-1. 1.2 Vacant 1.3 References 1.3.1 Normative references This British Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at appropriate places in the text an
26、d the publications are listed on the inside back cover. For a dated reference, only the edition cited applies; any subsequent amendments to or revisions of the publication apply to this British Standard only when incorporated in the reference by amendment or revision. For undated references, the lat
27、est edition of the publication applies together with any amendments. 1.3.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover,
28、 but reference should be made to the latest editions. 2 Definitions For the purposes of this British Standard, the definitions given in BS EN 60947-1:1992 apply, together with the following which have been reproduced from BS 88-1:1988, BS 89-1:1990, BS 3456-201:1990 and BS 4727-2:Group 06:1985. 2.1
29、fuse-carrier (206 8013 of BS 4727-2.06) the moveable part of a fuse designed to carry a fuse-link 2.2 fuse-base (fuse-mount) (2.1.2 of BS 88-1) the fixed part of a fuse provided with terminals for connection to the system. The fuse-base comprises all the parts necessary for insulation 2.3 fuse-holde
30、r (2.1.6 of BS 88-1) the combination of a fuse-base with its fuse-carrier 2.4 fuse-unit a fuse-holder incorporating neutral and earth terminals within an integral enclosure. It may also include a protective cover for the termination of multi-core cables 2.5 fuse-link (206 8009 of BS 4727-2.06) the p
31、art of a fuse (including the fuse-elements) intended to be replaced after the fuse has operated 2.6 fuse (cut-out) (206 8001 of BS 4727-2.06) a device that, by fusion of one or more of its specifically designed and proportioned components, opens the circuit in which it is inserted by breaking the cu
32、rrent when this exceeds a given value for a sufficient time. The fuse comprises all the parts that form the complete device 2.7 fuse-carrier contact (2.1.5 of BS 88-1) a conducting part of a fuse-carrier connected to a fuse-link contact and designed to engage with a fuse-base contact 2.8 fuse-link c
33、ontact (2.1.8 of BS 88-1) a conducting part of a fuse-link designed to engage with a fuse-base contact or with a fuse-carrier contact 2.9 fuse-base contact (fuse-mount contact)(2.1.3 of BS 88-1) a conducting part of a fuse-base connected to a terminal designed to engage with a fuse-carrier contact o
34、r with a fuse-link contact 2.10 interconnecting unit a unit providing additional insulation protection and security for the conductors connecting a fuse-unit to a tariff meter (see 2.4 and BS 89-1) 2.11 basic insulation (2.2.12 of BS 3456-201) the insulation applied to live parts to provide basic pr
35、otection against electric shock Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:22:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7657:1993 2 BSI 02-2000 2.12 supplementary insulation (2.2.13 of BS 3456-201) an independent insulation applied in addition to
36、the basic insulation in order to ensure protection against electric shock in the event of a failure of the basic insulation 2.13 double insulation (2.2.14 of BS 3456-201) insulation comprising both basic insulation and supplementary insulation 2.14 reinforced insulation (2.2.15 of BS 3456-201) a sin
37、gle insulation system applied to live parts, which provides a degree of protection against electric shock equivalent to double insulation under the conditions specified in this standard NOTEThe term “insulation system” does not imply that the insulation must be one homogeneous piece. It may comprise
38、 several layers which cannot be tested singly as supplementary or basic insulation 2.15 PME protective multiple earthing 3 Classification The fuse type shall be classified as follows. 3.101 Type A1 fuse-unit A single phase fuse-unit incorporating separate neutral and earth terminals with PME link. A
39、 separate cable termination cover may be provided, if required. 3.102 Type A2 fuse-unit A single phase fuse-unit incorporating combined neutral/earth terminals. A separate cable termination cover may be provided, if required. 3.103 Type A1 fuse A single phase fuse-unit fitted with an appropriate fus
40、e-link and incorporating separate neutral and earth terminals with connecting link. A separate cable termination cover may be provided, if required. 3.104 Type A2 fuse A single phase fuse-unit fitted with an appropriate fuse-link and incorporating combined neutral/earth terminals. A separate cable t
41、ermination cover may be provided, if required. 3.105 Type B fuse A single-pole fuse-holder fitted with an appropriate fuse-link. 3.106 Type C1 terminal block A terminal block containing a single-pole terminal assembly. 3.107 Type C2 terminal block A terminal block containing two mutually insulated s
42、ingle-pole terminal assemblies. 3.108 Type D interconnecting unit A unit providing additional insulation protection and security for the conductors connecting a fuse-unit to a tariff meter. 4 Characteristics Clause 4 of BS EN 60947-1 applies only in relation to the following characteristics, and wit
43、h deletions and additions to the subclauses as indicated: 4.1 General Subclause 4.1 of BS EN 60947-1 applies. 4.2 Type of equipment Subclause 4.2 of BS EN 60947-1 applies. 4.3 Rated and limiting values for the main circuits Subclause 4.3 of BS EN 60947-1 applies modified as follows: Deletions: 4.3.2
44、.1 Conventional free air thermal current (Ith) 4.3.2.2 Conventional enclosed thermal current (Ithe) 4.3.4 Rated duties 4.3.5 Normal load and overload characteristics 4.3.6 Short-circuit characteristics Additions: 4.3.2.4.101 Fuses A fuse shall be capable of carrying current up to its rated uninterru
45、pted current and the currents associated with the operation under fault conditions of any fuse-link conforming to BS 1361, which the fuse is designed to accommodate. In addition, the incoming phase and neutral terminals of type A fuses shall have a rated uninterrupted current of 130 A. Rated operati
46、onal voltage(Ue); Rated insulation voltage(Ui); Rated impulse withstand voltage(Uimp); Rated uninterrupted current(Iu); Rated frequency; Rated conditional short-circuit current(Icw). Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 12:22:08 GMT+00:00 2006, Uncont
47、rolled Copy, (c) BSI BS 7657:1993 BSI 02-20003 4.3.2.4.102 Terminal blocks and interconnecting units The terminal blocks and interconnecting units shall be capable of carrying the rated uninterrupted current. Modification: 4.3.1.1 Rated operational voltage (Ue) Fuses, terminal blocks and interconnec
48、ting units shall operate on low-voltage public electricity supply systems with a maximum voltage up to 440 V a.c. 5 Product information 5.1 Nature of information Subclause 5.1 of BS EN 60947-1 applies with the following modification. Characteristics: Delete the text and substitute the following: rat
49、ed operational voltage (Ue) 250 V a.c. (see 4.3.1.1); rated uninterrupted current (Iu) (see 4.3.1.1); the value of the rated frequency 50 Hz; rated insulation voltage (Ui) 440 V a.c. r.m.s.; rated impulse withstand voltage (Uimp) 6 kV; rated conditional short-circuit current 16 kA a.c. r.m.s (see 7.1.2.101) IP code (see Appendix C of BS EN 60947-1 and 7.1.11); pollution degree 2. 5.2 Marking Fuses shall be clearly and permanently marked as follows: fuse-carriers in accordance with BS 88-1; all major components with the identity of the manufacturer and marque