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1、BRITISH STANDARD BS 88-6:1988 Incorporating Amendment No. 1 Cartridge fuses for voltages up to and including 1000 V a.c. and 1500 V d.c. Part 6: Specification of supplementary requirements for fuses of compact dimensions for use in 240/415 V a.c. industrial and commercial electrical installations UD
2、C 621.316.923.2.027.2/.5 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 This British Standard, having been prepared under the direction of the Power Electrical Engineering Standards Committee, was
3、 published under the authority of the Board of BSI and comes into effect on 31 October 1988. BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference PEL/78 Draft for comment 86/27028 DC ISBN 0 580 16829 8 Committees responsible for this British Standard The
4、preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Committee (PEL/-) to Technical Committee PEL/78, upon which the following bodies were represented: Association of Supervisory and Executive Engineers Electrical Installation Equipment Manufacturers Assoc
5、iation (BEAMA Ltd.) Electrical Power Engineers Association Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association ERA Technology Ltd. London Regional Transport The following bodies were also represented in the drafting of the standard, through subcommi
6、ttees and panels: Association of Consulting Engineers ASTA Certification Services Electrical Contractors Association Institution of Electrical Engineers Ministry of Defence Amendments issued since publication Amd. No.Date of issueComments 6694April 1991Indicated by a sideline in the margin Licensed
7、Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 BSI 02-1999i Contents Page Committees responsibleInside front cover Forewordii 1 General 1.1Scope1 1.2Object1 1.3Compliance1 2Definitions 2.2General terms1 3E
8、xpected conditions of operation in service 3.9Discrimination1 5Characteristics of fuses 5.2Rated voltage1 5.3Rated current1 5.5Rated power dissipation of a fuse-link and rated power acceptance of a fuse holder1 5.6Limits of time/current characteristics1 5.7Breaking range and breaking capacity2 5.8Cu
9、t-off current and I2t characteristics2 5.9Dimensions2 7Standard conditions for construction 7.1Mechanical design2 7.6Cut-off current characteristic2 7.7I2t characteristics2 7.8Overcurrent discrimination2 8Tests 8.3Verification of temperature rise and power dissipation2 8.4Verification of operation2
10、8.5Verification of the breaking capacity2 8.7Verification of I2t characteristics and overcurrent discrimination2 Figure 1 Compact fuse-link dimensions3 Figure 2 Front connected fuse holders for compact fuse-links4 Figure 3 Time/current zones for F1 and F2 fuse-links5 Figure 4 Time/current zones for
11、E1 fuse-links7 Figure 5 Power dissipation test rig9 Table 1 Sizes of copper conductors and terminal bores2 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988
12、ii BSI 02-1999 Foreword This Part of BS 88 has been prepared under the direction of the Power Electrical Engineering Standards Committee. It gives requirements supplementary to those of BS 88-1 for a range of fuses for use in 240 V and 415 V a.c. industrial and commercial electrical installations. I
13、t is based on a proposal by the Electrical Installation Equipment Manufacturers Association. Fuses within the scope of this standard are not sensitive to normal electromagnetic disturbances, and therefore no immunity tests are required. Significant electromagnetic disturbance generated by a fuse is
14、limited to the instant of its operation. Provided that the maximum arc voltages during operation in the type test comply with the requirements of the clause in this standard specifying maximum arc voltage, the requirements for electromagnetic compatibility are deemed to be satisfied. A British Stand
15、ard 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 Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover,
16、an inside front cover, pages i and ii, pages 1 to 10, an inside back cover and a back cover. This 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 Univers
17、ity, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 BSI 02-19991 1 General 1.1 Scope This Part of BS 88 applies to fuses of compact dimensions primarily intended for use in 240/415 V a.c. industrial and commercial installations. It does not
18、cover fuses incorporating integral indicating devices. NOTESuch fuses should be the subject of agreement between the manufacturer and the user. 1.2 Object The object of this standard is to specify standard values for fuse holders and fuse-links. The characteristics specified for fuse-links are: a) t
19、ime/current zones and conventional currents; b) rated voltage; c) rated breaking capacity; d) maximum power dissipation; e) dimensions. The characteristics specified for fuse holders are: f) sizes of cable terminals or cable sockets; g) power acceptance; h) dimensions. 1.3 Compliance Compact fuses f
20、or industrial and commercial installations shall comply with all the requirements of BS 88-1 unless otherwise specified in this standard, and shall in addition comply with the following supplementary requirements. 2 Definitions For the purposes of this Part of BS 88, the definitions given in BS 88-1
21、 apply, together with the following. 2.2 General terms 2.2.14 industrial application of fuses the use of fuses in industrial applications where the fuse-links are accessible to and may be replaced by authorized persons only 2.2.15 commercial application of fuses the use of fuses in commercial instal
22、lations where the fuse-links are accessible to and may be replaced by laymen NOTE 1For this application protection against accidental contact with live parts is ensured by constructional means. NOTE 2The performance of fuses of this type is such that they may also be used in industrial applications.
23、 3 Expected conditions of operation in service 3.9 Discrimination Subclause 3.9 of Part 1 does not apply for E1 fuse-links or for F1 and F2 fuse-links of 16 A rating. In the case of these fuse-links, correct discrimination is ensured by adherence to the standard zones for time/current characteristic
24、s as specified in 5.6.1.1 and as given in Figure 3(a), Figure 3(b), Figure 4(a) and Figure 4(b). 5 Characteristics of fuses 5.2 Rated voltage This Part of BS 88 does not specify rated voltages. NOTEThe preferred rated voltages are 240 V a.c. and 415 V a.c. 5.3 Rated current This Part of BS 88 does n
25、ot specify rated currents. NOTE 1The preferred current ratings (in amperes) for fuse holders and fuse bases are 20, 32 and 63. NOTE 2The preferred current ratings (in amperes) for fuse-links are 2, 4, 6, 10, 16, 20, 25, 32, 40, 50 and 63. 5.5 Rated power dissipation of a fuse-link and rated power ac
26、ceptance of a fuse holder 5.5.1 Power dissipation of fuse-links. The maximum values of power dissipation permitted for fuse-links when tested in accordance with 8.3.1 are specified in Figure 1 when measured on the standard rig shown in Figure 8. 5.5.2 Power acceptance of fuse holders. The rated valu
27、es of power which fuse holders shall accept at rated current when tested in accordance with 8.3.2 are specified in Figure 2. NOTEThe point of measurement of voltage for determination of fuse holder power acceptance is shown in Figure 2. 5.6 Limits of time/current characteristics 5.6.1 Time/current c
28、haracteristics, time/current zones. This subclause of Part 1 applies with the following addition: Fuse-links shall be such that values derived from the specified tests do not deviate by more than 10 % in terms of current, from the manufacturers published curves. 5.6.1.1 Time/current zones. The stand
29、ard zones for time/current characteristics based on an ambient air temperature of 20 C and at rated voltage are as given in Figure 3(a), Figure 3(b), Figure 4(a) and Figure 4(b). 5.6.2 Conventional times and currents. The standard conventional non-fusing and fusing currents (INFand IF) shall be 1.25
30、 and 1.6 times rated current respectively. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 2 BSI 02-1999 5.6.3 Gates. Subclause 5.6.3 of Part 1 applies, except for E1 fuse-links or for F1 and F2 fu
31、se-links of 16 A rating. In the case of these fuse-links, correct discrimination is ensured by adherence to the standard zones for time/current characteristics as specified in 5.6.1.3 and as given in Figure 3(a), Figure 3(b), Figure 4(a) and Figure 4(b). 5.7 Breaking range and breaking capacity The
32、rated breaking capacities shall be: a) not less than 16.5 kA at a rated voltage of 240 V; b) not less than 80 kA at a rated voltage of 415 V. 5.8 Cut-off current and I2t characteristics This subclause of Part 1 applies. I2t characteristics may alternatively be given as a representation of I2t values
33、 plotted as a function of rated current under stated conditions. 5.9 Dimensions 5.9.1 Dimensions for fuse-links are given in Figure 1. E1 fuse-links are rated at 240 V and F1 and F2 fuse-links are rated at 415 V. 5.9.2 Dimensions for fuse holders are given in Figure 2. 7 Standard conditions for cons
34、truction 7.1 Mechanical design 7.1.4 Sizes of cable terminals. Outgoing terminals of fuse holders shall accept stranded or solid copper conductors with cross-sectional areas as given in Table 1. Table 1 Sizes of copper conductors and terminal bores 7.6 Cut-off current characteristic Cut-off valves s
35、hall additionally be made available to the user on request. 7.7 I2t characteristics I2t values shall additionally be made available to the user on request. 7.8 Overcurrent discrimination This subclause applies, except that for fuse-links of 16 A rating, and F1 and F2 fuse-links of 20 A rating, compl
36、iance with this standard is confirmed by adherence to the standard zones for time/current characteristics as specified in 5.6.1.3 and as given in Figure 3(a), Figure 3(b), Figure 4(a) and Figure 4(b). 8 Tests 8.3 Verification of temperature rise and power dissipation 8.3.1 Arrangement of the fuse. F
37、use-links shall be tested for power and dissipation in the test rig shown in Figure 5. 8.4 Verification of operation 8.4.1 Arrangement of the fuse. Fuse-links shall be tested for time/current characteristics in the test rig shown in Figure 5. 8.4.3.3.2 Verification of gates. Subclause 8.4.3.3.2 of P
38、art 1 applies except that for fuse-links of 16 A rating, and F1 and F2 fuse-links of 20 A rating, compliance is confirmed by adherence to the standard zones for time/current characteristics as specified in 5.6.1.3 and as given in Figure 3(a), Figure 3(b), Figure 4(a) and Figure 4(b), and verified as
39、 in 8.4.3.3.1. 8.5 Verification of the breaking capacity 8.5.1 Fuse-links shall be tested for breaking capacity in fuse holders which comply with this standard. The fuse holder shall be rigidly supported and any conductor necessary for the connection of the fuse holder to the main circuit test conne
40、ctions shall have as large a cross section as can be accepted in the fuse holder terminal and shall be as short as possible. The disposition of the test connections beyond the test rig, i.e. fuse holder and any conductors required to connect it to the test connections, is not specified. 8.7 Verifica
41、tion of I2t characteristics and overcurrent discrimination 8.7.3 Verification of compliance at 0.01 s. For fuse-links of 16 A rating, and F1 and F2 fuse-links of 20 A rating, compliance at 0.01 s is confirmed by adherence to the standard zones for time/current characteristics as specified in 5.6.1.3
42、 and as given in Figure 3(a), Figure 3(b), Figure 4(a) and Figure 4(b), and verified as in 8.4.3.3.1. In of fuse baseNominal area of conductor max. Minimum diameter of bore A mm2 mm 20 32 63 4 10 25 3.0 4.5 7.0 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:
43、07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 BSI 02-19993 FuseMax. pref. current rating Max. power dissipation Dimensions (in mm) aa bdefn A W max.max.max.min.max.min.max.min.max.min. E1201.82514.5514713111.50.83.83.2 F1323.235.514.5625813111.50.83.83.2 F2634.83917.5696515.514.51.61
44、.23.83.2 a Dimension “a” may be up to 0.5 mm more than the stated value to allow for projecting rivet heads at the centres of tag faces. Figure 1 Compact fuse-link dimensions Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled C
45、opy, (c) BSI BS 88-6:1988 4 BSI 02-1999 Fuse link Rated current A Minimum power acceptance Dimensions (in mm) ABC Wmax.max.max. E1202267159 F1323.5268159 F2635329668 The above illustration does not prejudice the use of other shapes or forms provided they fall within the maximum dimensions listed. Fi
46、gure 2 Front connected fuse holders for compact fuse-links Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 BSI 02-19995 Figure 3 Time/current zones for F1 and F2 fuse-links Licensed Copy: London So
47、uth Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 6 BSI 02-1999 Figure 3 Time/current zones for F1 and F2 fuse-links (concluded) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57
48、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 BSI 02-19997 Figure 4 Time/current zones for E1 fuse-links Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 8 BSI 02-1999 Figure 4 Time/curre
49、nt zones for E1 fuse-links (concluded) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 88-6:1988 BSI 02-19999 Fuse link abcdefghjmtCurrent rating A E11012.5165012.540281.6M4300.520 F11012.5165012.540281.6M4400.532 F21612.516501545281.6M5451.063 Figure 5 Power dissipation test rig Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 02:07:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 10 blank Licensed Copy: Lon