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1、BRITISH STANDARD BS 2848:1973 Incorporating Amendment No. 1 Specification for Flexible insulating sleeving for electrical purposes UDC 621.315.61 462 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:55:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2848:1973 This British Standard, having
2、been approved by the Electrical Industry Standards Committee, was published under the authority of the Executive Board on 12 October 1973 BSI 02-2000 First published April 1957 First revision October 1973 The following BSI references relate to the work on this standard: Committee reference ELE/16/53
3、 and ELE/16/53/28 Draft for comment 69/12330 ISBN 0 580 07531 1 Co-operating organizations The Electrical Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial orga
4、nizations: The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Associated Officers Technical CommitteeElectric
5、al Contractors Association Association of Consulting EngineersElectrical Contractors Association of Scotland Association of Manufacturers of Domestic Electrical Research Association* Electrical AppliancesElectricity Council, the Central Electricity Association of Mining Electrical andGenerating Boar
6、d and the Area Boards in Mechanical EngineersEngland and Wales* Association of Supervisory and ExecutiveElectronic Engineering Association* EngineersEngineering Equipment Users Association British Electrical and Allied ManufacturersInstitution of Electrical and Electronics Association*Technician Eng
7、ineers British Railways BoardInstitution of Electrical Engineers British Radio Equipment ManufacturersLighting Industry Federation Limited AssociationMinistry of Defence British Steel CorporationNational Inspection Council for Electrical Crown Agents for Oversea Governments andInstallation Contracti
8、ng AdministrationsNational Physical Laboratory (Department of Department of EmploymentTrade and Industry)* Department of the EnvironmentOil Companies Materials Association Department of Trade and Industry*Post Office* Electric Cable Makers Confederation*South of Scotland Electricity Board Adhesive T
9、ape Manufacturers AssociationMinistry of Defence, Army Department Association of Electrical Machinery TradesMinistry of Defence, Navy Department British Calibration ServiceMinistry of Defence, Procurement Executive British Electro-Ceramic ManufacturersNarrow Fabrics Federation AssociationRadio and E
10、lectronic Component British Plastics FederationManufacturers Federation Confederation of British IndustrySociety of Motor Manufacturers and Traders Engineering Standards Co-ordinatingLtd. CommitteeTelecommunication Engineering and Glass Textile AssociationManufacturing Association Amendments issued
11、since publication Amd. No.DateComments 3176February 1980Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:55:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2848:1973 BSI 02-2000i Contents Page Co-operating organizationsInside front cover Forewordii 1Sc
12、ope1 2Types of sleeving1 3Colour2 4Finish2 5Dimensions and tolerances2 6Samples3 7Applicability of tests3 8Test conditions3 9Mechanical tests3 10Chemical and physical tests7 11Electrical tests9 12Mould growth9 13Accelerated damp heat9 14Transparency (optional requirement)9 Appendix A Measurement of
13、bore and wall thickness11 Appendix B Bending test11 Appendix C Flexibility test12 Appendix D Tensile strength and elongation at break13 Appendix E Acidity test13 Appendix F Test for stability of varnish14 Appendix G Shrinkage test14 Appendix H Cold flow test15 Appendix J Resistance to soldering heat
14、15 Appendix K Rate of burning test15 Appendix L Self-extinguishing test16 Appendix M Volatile content16 Appendix N Proof test for electric strength16 Appendix P Insulation resistance tests17 Appendix Q Accelerated damp heat treatment18 Appendix R Transparency18 Figure 1 Apparatus for measuring flexi
15、bility of sleeving19 Figure 2 Specimen for solder test20 Figure 3 Specimen for insulation resistance test21 Table 1 Table deleted Table 2 Nominal bore diameters3 Table 3 Dimensions and tolerances for bore and wall thickness4 Table 4 Applicability of tests6 Table 5 Acidity7 Table 6 Applicability of v
16、oltage proof tests9 Table 7 Proof voltages and minimum values of insulation resistance10 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:55:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2848:1973 ii BSI 02-2000 Foreword This revision of BS 2848
17、is based on information provided by the Electrical Research Association, but is looked upon as an interim revision pending more radical changes. Type 2, which was in the previous edition, has been omitted because this type is no longer being produced in sufficient quantity to justify inclusion in th
18、is standard. Types 3/85RT, 3/105RT and 5/180RT have also been omitted because these types are no longer being produced in sufficient quantity to justify inclusion in the standard, thus rendering the symbol “R”, used to denote additional external textile braid, unnecessary. Type 4. extruded polyethyl
19、ene sleeving, has been omitted because it is no longer readily available. The remaining Types retain their original numbers to avoid confusion. The majority of Types 1/105a and 1/105b and 1/130a and 1/130b sleeving do not meet the requirements for tropical sleeving given in Clauses 11, 12 and 13. Co
20、nsequently, Type 105T has been deleted and Type 130T replaced by Types 1/130a and 1/130b, but sleeving of these Types which meets the requirements of Clauses 11, 12 and 13 may include the letter T in its reference. Type 1/60T has been replaced by sleeving which has a higher operating temperature, e.
21、g. Types 1/105a and 1/105b. Type 5/180 now includes a and b differentiated by a test for volatile content. The heat test has been omitted because it is considered that the property assessed by this test is covered by the test for resistance to soldering heat, the bending test after ageing and/or the
22、 shrinkage test. The test for long term damp heat has been omitted because it is considered that the accelerated damp heat test examines similar properties. The test for resistance to splitting was previously applicable to Types 3 and 5. It is now applicable only to Type 3 and a test for tensile str
23、ength and elongation at break has been included for Type 5. The flexibility test has been re-named the bending test and a new flexibility test has been included as an optional requirement. The slip-back test has been omitted because sleeving with external braid is no longer covered by this standard.
24、 Amendment No. 1:1979 introduces into Type 1 sleeving Types 1/155a and 1/155b. It also permits the use of knitted bases as well as braids for all Type 1 sleeving. Different fibres or a different construction in the textile base of the sleeving may affect certain properties not specifically covered i
25、n this standard. 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 Standard does not of itself confer immunity from legal obligations. Summary of pages This do
26、cument comprises a front cover, an inside front cover, pages i and ii, pages 1 to 22, 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
27、 Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:55:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2848:1973 BSI 02-20001 1 Scope This British Standard specifies requirements and dimensions for a range of flexible insulating sleevings of circular section, intended primarily for insulating electri
28、cal conductors and connections of electrical apparatus. This standard includes sleevings made by varnishing or coating a textile base, and others formed by extrusion of suitable insulating materials. NOTE 1Some of the types of sleeving included are also suitable, especially in the larger sizes, for
29、covering and holding together a number of conductors which are already individually insulated. NOTE 2The tests specified are designed to control the quality of the sleeving, but it is recognized that they do not completely establish the suitability of sleeving for varnish and wax impregnation proces
30、ses or the use of sleeving in contact with other materials. It is, therefore, recommended that appropriate impregnation or compatibility tests be agreed where necessary between the purchaser and the supplier to suit individual circumstances. NOTE 3The titles of the British Standards referred to in t
31、his standard are listed on the inside back cover. 2 Types of sleeving 2.1 References. The various sleevings have been given references, e.g. Type 3/105T, in which the first number indicates the general make-up and material of the sleeving, the second number indicates (in degrees Celsius) the maximum
32、 operating temperature, and the letter T signifies that this sleeving is suitable for use under tropical or similar severe conditions, within the appropriate temperature limitation. The Type numbers are not consecutive for the reasons given in the Foreword. 2.2 Construction. The sleeving shall be co
33、nstructed as follows: Type 1. Sleeving made by applying to a textile base an adherent continuous coating of suitable compound or varnish. For sleeving having a textile base of glass, the glass shall be of “E Type” (low alkali content). Type 3. Extruded sleeving of polyvinyl chloride or its co-polyme
34、rs, suitably plasticized: 3/85T 3/105T Type 5. Extruded sleeving of silicone elastomer: 5/180Ta1) 5/180Tb Type 6. Extruded sleeving of polytetrafluoroethylene: 6/250T 1/105a:Textile base of cotton or regenerated cellulose. 1/105b:Textile base of cotton or regenerated cellulose with a higher electric
35、al strength than that of 1/105a. 1/130a:Textile base of glass or polyethylene terephthalate. 1/130b:Textile base of glass or polyethylene terephthalate with a higher electrical strength than that of 1/130a. 1/155a:Textile base of glass with higher temperature resisting coating than that of 1/130a. 1
36、/155b:Textile base of glass with higher temperature resisting coating than that of 1/130a and higher dielectric strength than that of 1/155a. NOTESleeving of Types 1/105a, 1/105b, 1/130a, 1/130b, 1/155a and 1/155b satisfying the requirements given in clauses 11, 12 and 13 may include the letter “T”
37、in the reference. 1/180Ta: Single or double textile base of glass usually with a silicone varnish or elastomer coating applied by a dipping process. 1/180Tb: Textile base of glass with a silicone elastomer coating applied by extrusion or a multi-dip process. The sleeving has a higher electric streng
38、th than that of 1/180Ta. 1/250T:Textile base of glass usually with a polytetrafluoroethylene (PTFE) coating. 1) The requirements of Type 5/180Ta do not necessitate the elastomer being fully cured. This is normally only of importance where the sleeving is to be used at elevated temperature under circ
39、umstances where the release of volatiles is undesirable. In such circumstances Type 5/180Tb should be specified by the purchaser. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:55:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2848:1973 2 BSI 02-2000 3 Colour 3.1 Type 1 (coated textile)
40、 sleeving. Type 1 sleeving shall be in one of the following colours: black, blue, brown, cream, green, grey, orange, pink, red, violet, white or yellow. The colour shall be a reasonable match with one of those specified in BS 6746C. 3.2 Type 3 (PVC) sleeving or Type 1 with PVC coating. The colour of
41、 the opaque versions of these types of sleeving shall be one of those specified in BS 6746C. The colour of transparent Type 3 sleeving is left for agreement between the purchaser and the supplier. 3.3 Type 5 (silicone) sleeving or Type 1 with silicone elastomer coating. The colour of the opaque vers
42、ions of these types of sleeving shall be a reasonable match to one of those specified in BS 6746C. It is recognized that an exact match may be impracticable and that a true black cannot be obtained in silicone elastomer. The colour of transparent Type 5 sleeving is left for agreement between the pur
43、chaser and the supplier. 3.4 Type 6 (PTFE) sleeving. Type 6 sleeving shall be in natural or coloured form. When coloured, the colour shall be a reasonable match with one of those specified in BS 6746C. It is recognized that an exact match may be impracticable and that PTFE sleeving may not be availa
44、ble in the full colour range. 3.5 Colour fastness to light. Sleeving of Types 3, 5 and 6 when tested for colour fastness to light as described in BS 3858 shall meet the requirements of Standard 6. 4 Finish 4.1 The sleeving shall be uniform in appearance and reasonably smooth and free from external a
45、nd internal irregularities. Sleeving incorporating textiles shall be made from yarn free from defects likely to cause irregularities. The coating material of textile-based sleeving shall be uniform and continuous and shall adhere firmly to the textile base. 5 Dimensions and tolerances 5.1 Length. Th
46、e lengths in which the sleeving is to be supplied are left for agreement between the purchaser and the supplier. NOTESleevings are normally supplied in the following lengths: Type 1. In lengths up to 1 m (present commercial practice is for lengths up to one yard and will continue until suppliers are
47、 able to convert their equipment) or in continuous lengths. All other types. In continuous lengths wound on reels or in coils. The continuous lengths of Type 6 which are available are dependent on the bore and wall thickness of the sleeving. All types may usually be obtained in cut lengths. 5.2 Bore
48、 and wall thickness. The nominal bore diameter shall be one of those specified in Table 2. Due precautions shall be taken against flattening. When measured in accordance with Appendix A, the bore and mean wall thickness shall comply with the requirements given in Table 3. In addition, the minimum me
49、asured wall thickness of extruded sleeving, established by any suitable means at any cross section, shall at any point be not less than the appropriate minimum given in Table 3. NOTE 1Sleeving with non-standard nominal bore diameters may be obtainable from some suppliers. NOTE 2In the cases given in note 1 it is recommended that the tolerances should be those for the next smaller standard nominal bore diameter. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 28 13:55:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2848:1973 BSI 02-20003 Table 2