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1、BRITISH STANDARD BS 6121-2: 1989 Mechanical cable glands Part 2: Specification for polymeric glands UDC 621.315.687.6:621.643.414:678.7.077-762.44 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-2:1989 This British Standard, having b
2、een prepared under the direction of the General Electrotechnical Engineering Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 August 1989 BSI 01-1999 The following BSI references relate to the work on this standard: Committee reference GEL
3、/3 Draft for comment 87/30058 DC ISBN 0 580 17247 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Electrotechnical Engineering Standards Policy Committee (GEL/-) to Technical Committee GEL/3, upon which the following bodies wer
4、e represented: Aluminium Federation Association of Consulting Engineers Association of Manufacturers of Domestic Electrical Appliances British Approvals Service for Electric Cables British Cable Makers Confederation British Plastics Federation British Railways Board British Shipbuilders British Stee
5、l Industry British Telecommunications plc Department of Energy (Electricity Division) Department of the Environment (Property Services Agency) Department of Trade and Industry (Consumer Safety Unit, CA Division) Electricity Supply Industry in England and Wales Engineering Equipment and Materials Use
6、rs Association ERA Technology Ltd. Institution of Electrical Engineers London Regional Transport The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of Supervisory and Executive Engineers Electrical, Electronic, Telecommunications
7、 and Plumbing Union Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Engineering Industries Association Gland Manufacturers Technical Committee Health and Safety Executive Lighting Industry Federation Ltd. Amendments issued since publication Amd. No.DateComments Licensed Copy
8、: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-2:1989 BSI 01-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Types of gland1 4Sizes of gland1 5Marking1 6Materials and construction2 7Dimensions2 8Typ
9、e tests3 Appendix A Information to be supplied when ordering 5 Appendix B Temperature conditioning for tests 5 Appendix C Proof torque test 5 Appendix D Load test 5 Appendix E Seal test for glands of type A2 6 Appendix F Radial load torque test 6 Appendix G Endurance test 6 Appendix H Flammability t
10、est 6 Figure 1 General construction of polymeric cable gland 3 Figure 2 Load test5 Figure 3 Radial load torque test7 Table 1 Glands for unarmoured cables2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c)
11、BSI BS 6121-2:1989 ii BSI 01-1999 Foreword This Part of BS 6121 has been prepared under the direction of the General Electrotechnical Engineering Standards Policy Committee. BS 6121-1 gives requirements and tests for metallic cable glands. This Part of BS 6121 specifies a range of polymeric cable gl
12、ands dimensionally standardized to a sufficient extent to ensure the interchangeability of glands of similar type and size made by different manufacturers. It provides for mechanical glands with International Organization for Standardization (ISO) metric threads as specified in BS 3643 on the thread
13、ed fixing component, such as are used with elastomer-insulated and PVC-insulated cables. Thread forms based on other International Standards are accepted. To avoid restricting development, only dimensions essential to interchangeability of the whole gland are specified, and no attempt has been made
14、to secure interchangeability of components and cable cutting dimensions between different makes. It is intended to publish two further Parts to BS 6121-3 will be a specification for composite glands manufactured from a combination of both metallic and polymeric components; and Part 4 will provide a
15、code of practice for all types of mechanical cable glands specified in Parts 1, 2 and 3. Attention is drawn to Appendix A, which lists the information to be supplied by the purchaser when ordering the glands. A British Standard does not purport to include all the necessary provisions of a contract.
16、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, an inside front cover, pages i and ii, pages 1 to 8, an inside back cover, a
17、nd 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: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-2
18、:1989 BSI 01-19991 1 Scope This Part of BS 6121 specifies requirements for limiting dimensions, marking, materials, construction and type tests for type A polymeric mechanical cable glands. It provides for interchangeability between complete glands of different makes, but not between component parts
19、. The glands are suitable for use with unarmoured cables complying with the following British Standards, but the range of glands specified does not completely cover all the cables included in these standards. BS 6004, Specification for PVC-insulated cables (non-armoured) for electric power and light
20、ing. BS 6007, Specification for rubber-insulated cables for electric power and lighting. BS 6346, Specification for PVC-insulated cables for electricity supply. BS 6500, Specification for insulated flexible cords and cables. The glands are also suitable for use with certain cables of generally simil
21、ar type not included in these British Standards. No provision is included for making electrical connections to the gland. NOTE 1The information to be supplied by the purchaser when ordering is given in Appendix A. NOTE 2The titles of the publications referred to in this standard are listed on the in
22、side back cover. 2 Definitions NOTESee Figure 1. For the purposes of this Part of BS 6121, the definitions given in BS 4727-2:Group 08 apply, together with the following. 2.1 polymeric cable gland a device manufactured in polymeric material designed to attach and secure the end of an unarmoured cabl
23、e to the equipment by means suitable for the type and description of cable for which it is designed NOTEThese glands may also be used for securing and/or sealing cables passing through either bulkheads or gland plates. 2.2 mechanical cable gland a cable gland in which the cable is secured 2.3 sealed
24、 gland a gland having a seal so constructed as to exclude dust and water under the conditions prescribed in Appendix E (IP66 test) 2.4 threaded fixing component the part of a cable gland designed for attaching it to the casing of the apparatus to which the cable is to be connected. It is provided wi
25、th an external thread which either engages in a similarly threaded hole in the casing of the apparatus, or is inserted through a plain hole in the casing and secured by means of a locknut inside the casing 2.5 outer sheath of a cable a polymeric layer applied to the outside of a cable 2.6 protrusion
26、 the distance which the gland protrudes outside the apparatus casing when the gland is assembled with the largest cable for which it is designed, and with the seal compression nut tightened to the proof torque specified in the appropriate table 3 Types of gland The basic designations of the glands a
27、re as follows. Type A1P. For unarmoured cable with a polymeric outer sheath, where the function of the gland is to secure the outer sheath of the cable. Type A2P. As type A1, but with an IP66 seal between the outer sheath and gland. 4 Sizes of gland The size designations, of which there are 10, and
28、the range of sizes for each type are shown in Table 1, the suffix “S” denoting smaller bore. 5 Marking An appropriate part of the gland shall be legibly and permanently marked with the following particulars: a) the manufacturers identification, e.g. name or trade mark; b) the size designation of the
29、 gland (see clause 4); c) whenever possible, the type of the gland. All identification labels used for packaging shall carry the number of this British Standard, i.e. BS 6121-21). 1) Marking BS 6121-2 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim b
30、y or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of conformity, which may also be desira
31、ble. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-2:1989 2 BSI 01-1999 Table 1 Glands for unarmoured cables Where printing is used for marking the gland, the permanency of identification shall be checked by inspection and by rubbi
32、ng the mark by hand for 15 s with a piece of cloth soaked with water and again for 15 s with a piece of cloth soaked with petroleum spirit. 6 Materials and construction (seeFigure 1) 6.1 Materials All parts of the gland shall be made of a polymeric material except the skid washer which shall be made
33、 of metallic, polymeric or fibrous material. No restriction is placed on the kind of polymer used, provided that the gland is capable of meeting the requirements of this standard. NOTEAttention is drawn to the fact that no polymeric material is completely resistant to solvents, oil and greases. 6.2
34、Construction 6.2.1 General. Those parts of the gland that have to be tightened or held during installation shall be hexagonal or have hexagons formed on them. All externally projecting edges and corners of gland components shall be rounded or chamfered to reduce the danger of injury in handling or a
35、fter installation. Each gland shall be capable of being attached to the appropriate apparatus through a single clearance or threaded circular hole of the appropriate diameter. The use of skid washers is permitted. The face of the gland which is to be clamped against the apparatus casing shall be mac
36、hined normally to the axis of the gland. NOTEA locknut is not normally regarded as part of a cable gland. When locknuts are supplied the combined gland and locknut assembly should comply with this Part of BS 6121. 6.2.2 Sealing devices. Sealing devices shall consist of an elastomeric compound comply
37、ing with 8.5. When used with a gland and cable of the appropriate size, the sealing device shall not damage the insulation or sheath of the cable. 7 Dimensions 7.1 Threaded fixing component 7.1.1 Thread. The thread on the threaded fixing component shall be the ISO metric thread in accordance with BS
38、 3643 for all sizes of gland, but other forms complying with national or international standards (e.g. DIN 40 4302), Fed Std H.282) are permissible provided the glands meet all the other requirements of this standard. The nominal size of the thread shall be one of the values given in Table 1. Size d
39、esignation101216a20Sb20b25324050S50 Thread size 1.5p 8g, mmM10cM12M16M20M20M25M32M40M50M50 Minimum length of thread on threaded fixing component, mm 10101010101010151515 Minimum bore (threaded fixing component), mm5.06.58.510.513.518.325.332.038.044.0 Maximum protrusion from mounting face, mm2020252
40、5303035405050 Gland maximum diameter, mm19192632385155709797 Maximum diameter of cable, mm4.06.08.010.013.218.025.031.537.043.0 Proof torque, Nm55710101525304545 Diameter of test mandreld and minimum diameter of cable clamp/outer seal, mm1.52.54.07.59.513.017.524.531.036.5 Load test load, N202020208
41、3035404550 Radial lead test torque, Nm3030303030304090120120 a This size gland is available with a M20 entry thread (designated 16/20). b This size gland is available with a M25 entry thread (designated 20/25). c Pitch 1.0 for M10 thread. d Subject to tolerances of + 0.5 mm for glands of all sizes.
42、2) Available from BSI Sales Department, BSI, Linford Wood, Milton Keynes MK 14 6LE. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:25:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-2:1989 BSI 01-19993 7.1.2 Length. The length of thread from the face of the gland on the threaded fix
43、ing component shall be not less than the appropriate value given in Table 1. 7.2 Minimum bore The minimum bore diameter of the threaded fixing component shall be in accordance with Table 1. A plug-gauge of a size not less than the maximum diameter of the cable shall pass through the gland with the s
44、eal uncompressed. 7.3 Protrusion The protrusion from the mounting surface shall not exceed the appropriate maximum value given in Table 1, when the cable gland is assembled on the plug-gauge or a mandrel of the same diameter as the maximum cable size and the threaded fixing component is tightened to
45、 the proof torque. 7.4 Gland maximum diameter across corners The diameter of an imaginary cylinder, coaxial with the gland and enclosing it, shall not exceed the appropriate maximum value given in Table 1. 7.5 Dimensions across flats of hexagons Every hexagonal part shall fit one of the spanners lis
46、ted in BS 192. 7.6 Cable overall diameter The gland shall be capable of accommodating cable of the appropriate maximum overall diameter as shown in Table 1. 8 Type tests 8.1 General No gland shall be adjusted during the test. NOTEThe type tests are for proving the design. 8.2 Temperature conditionin
47、g Prior to proceeding with the tests detailed in 8.3 to 8.6, a quantity of glands of each size and type sufficient to meet the test series shall be subjected to temperature conditioning as described in Appendix B. NOTETemperature conditioning considerably reduces the water absorption characteristics
48、 of the specimen, and produces a proof condition for the tests specified in this standard. The tests specified in 8.3 to 8.6 shall be carried out within 48 h of this temperature conditioning. 8.3 Proof torque test 8.3.1 General. The proof torque test is in two parts: specimens of both types of gland
49、 shall undergo testing at an ambient temperature of 23 5 C and, subsequently, at a temperature of 5 C. NOTE 1Any distortion of the seals can be ignored for the purpose of this test. NOTE 2This test is designed to prove that the mechanical strength of the gland is adequate to meet conditions encountered in use. 8.3.2 At ambient temperature. There shall be no damage to the threads and no detrimental effect to the hexagon on dismantling after the gland has been tested as described in Appendix C. NOTEThis figure illustrates the terms used in this standa