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1、BRITISH STANDARD BS 6121-1:2005 Mechanical cable glands Part 1: Armour glands Requirements and test methods ICS 21.140 ? Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:41:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-1:2005 This British Standard was published under the authority o
2、f the Standards Policy and Strategy Committee on 21 February 2005 BSI 21 February 2005 First published as BS 6121 February 1973 Second edition December 1987 Third edition January 1990 Fourth edition February 2005 The following BSI references relate to the work on this British Standard: Committee ref
3、erence GEL/20/11/1 Draft for comment 98/263249 DC ISBN 0 580 45374 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee GEL/20, Electric cables, to Subcommittee GEL/20/11/1, Cable glands, upon which the following bodies were
4、 represented: BEAMA Ltd. Council for Electrical Equipment BEAMA Installation Ltd. British Approvals Service for Cables British Cables Association Gland Manufacturers Technical Committee Co-opted members Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun,
5、na, Tue Dec 05 05:41:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-1:2005 BSI 21 February 2005 i Contents Page Committees responsible Inside front cover Forewordii 1Scope1 2Normative references1 3Terms and definitions1 4Requirements1 5Test samples, test conditions and test schedule4 6Marking
6、 and information5 Table 1 Forces for cable retention test2 Table 2 Test samples and test schedule4 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:41:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-1:2005 ii BSI 21 February 2005 Foreword This part of BS 6121 has been prepared by Subc
7、ommittee GEL/20/11/1. Together with BS EN 50262:1999, it supersedes BS 6121-1:1989 which is withdrawn. This revision of BS 6121-1 covers only armour glands, which are outside the scope of BS EN 50262 because they do not provide a seal. This publication does not purport to include all the necessary p
8、rovisions of a contract. Users are responsible for its 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 5 and a back cover. The
9、BSI copyright notice displayed in this document indicates when the document was last issued. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:41:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-1:2005 BSI 21 February 2005 1 1 Scope This part of BS 6121 specifies performance requirement
10、s for armour glands for use with armoured cables. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including a
11、ny amendments) applies. BS 21:1985 including Amendment 1:1990, Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions). BS 31:1940 including Amendments 1:1965, 2:1967, 3:1969, 4:1970 and 5:1987, Specification for steel conduit and
12、 fittings for electrical wiring. BS EN 50262:1999 including Amendments 1:2001 and 2:2004, Cable glands for electrical installations. BS EN 60423:1995, Conduits for electrical purposes Outside diameters of conduits for electrical installations and threads for conduits and fittings. BS EN 60529:1992 i
13、ncluding Amendments 1:1993 and 2:2000, Degrees of protection provided by enclosures (IP code). BS EN ISO 228-1:2003, Pipe threads where pressure tight joints are not made on the threads Part 1: Dimensions, tolerances and designation. BS ISO 965-3, ISO general purpose metric screw threads Tolerances
14、Part 3: Deviations for constructional screw threads. ANSI/ASME B1.20.1:1983, Pipe threads, general purpose (inch). 3 Terms and definitions For the purposes of this part of BS 6121, the terms and definitions given in BS EN 50262:1999 and the following apply. 3.1 armour gland device which anchors the
15、armour of an armoured cable at the cable entry point of an enclosure and provides an electrical connection to the armour, but which does not provide a seal 4 Requirements 4.1 Construction 4.1.1 General Armour glands shall not have any internal sharp edges, which might cause damage to any cables, fle
16、xible cables or insulated conductors which pass through them in service. Those parts of an armour gland that are used for tightening or for holding during installation shall be of hexagonal form. External projecting edges and corners of armour gland components shall be smooth and free from burrs. Li
17、censed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:41:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-1:2005 2 BSI 21 February 2005 4.1.2 Entry thread The entry thread of metric armour glands in sizes up to M75 shall be constructed in accordance with BS EN 60423:1995, Table 1. For sizes g
18、reater than M75 the entry thread shall be constructed in accordance with BS ISO 965-3 and with a thread pitch of 1.5 mm, 2 mm or 3 mm. The entry thread of non-metric armour glands shall be in accordance with one of the following standards: BS 31:1940; BS EN ISO 228-1:2003; BS 21:1985; or shall be of
19、 one of the following types: NPSM conforming to ANSI/ASME B1.20.1:1983; NPT conforming to ANSI/ASME B1.20.1:1983. 4.2 Performance NOTEArmour glands specified in this standard are, in normal use, considered to be passive in respect of electromagnetic emission and immunity, so no requirements for thes
20、e parameters are specified. 4.2.1 Mechanical performance NOTEThe test sequence is given in 5.4. 4.2.1.1 Cable retention After testing in accordance with BS EN 50262:1999, 10.4.1, but using the force specified in Table 1, the cable shall not have moved relative to either of the glands by more than 3
21、mm at the end of a 5 min test. Table 1 Forces for cable retention test 4.2.1.2 Resistance to impact After being assembled on a piece of cable having the smallest armour thickness in the range for which the gland is suitable, as stated in the information supplied by the manufacturer, and being subjec
22、ted to the test specified in BS EN 50262:1999, 9.4, using the impact values applicable to the impact category that the gland is claimed to be, as stated by the manufacturer, the armour gland shall show no visible signs of damage. 4.2.1.3 Resistance to excess torque For armour glands that are assembl
23、ed by being screwed together, after being assembled on a piece of cable having the largest armour thickness in the range for which the gland is suitable, as stated in the information supplied by the manufacturer, using a torque 1.5 times the installation torque given in the manufacturers instruction
24、s, the armour gland shall show no visible signs of damage. Cable diameterForce mmN 4 k8 640 8 k11 880 11 k161 280 16 k231 840 23 k312 480 31 k433 440 43 k554 400 55 k705 600 7080Da a D is the actual cable diameter in millimetres (mm). Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:41:59 G
25、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-1:2005 BSI 21 February 2005 3 4.2.2 Electrical performance NOTEThe test sequence is given in 5.4. 4.2.2.1 Equipotential bonding When armour glands which are claimed by the manufacturer to provide equipotential bonding are tested in accordance with BS
26、 EN 50262:1999, 10.1, in no case shall the resistance exceed 0.1 7. 4.2.2.2 Electrical connection to metallic layer(s) of cable When armour glands are tested in accordance with BS EN 50262:1999, 10.2, the resistance between the gland and the armour shall not exceed 0.1 7. When armour glands which ar
27、e claimed by the manufacturer to provide an electrical connection to metallic layer(s) of the cable other than the armour are tested in accordance with BS EN 50262:1999, 10.2, the resistance between the gland and each metallic layer of the cable other than the armour shall not exceed 0.1 7. 4.2.2.3
28、Insulation resistance When armour glands which are claimed by the manufacturer to have insulating characteristics are conditioned in accordance with BS EN 50262:1999, 10.3.1, and then tested in accordance with BS EN 50262:1999, 10.3.2, the insulation resistance shall be not less than 5 M7. 4.2.2.4 P
29、rotective connection to earth When armour glands which are claimed to have a protective connection to earth are tested in accordance with BS EN 50262:1999, 10.4.2, using the current specified for the relevant category of gland as given in BS EN 50262:1999, Table 5, for 1 s, the following requirement
30、s shall be met. During the test, the flow of current shall not be interrupted. After the test there shall be a contact resistance between the armour close to the gland and the earthing connections, measured with a source of at least 10 A, of 0.1 7 or less. After the test the gland shall not exhibit
31、any cracks visible to normal or corrected vision without magnification and shall not have any loose parts or show evidence of deformation. 4.2.3 Resistance to environmental factors NOTEThe test sequence is given in 5.4. 4.2.3.1 Ingress protection Armour glands shall provide a minimum degree of prote
32、ction of IP2X when tested in accordance with BS EN 60529:1992. 4.2.3.2 Resistance to abnormal heat When exposed non-metallic parts of the armour gland are tested in accordance with BS EN 50262:1999, 12.2: there shall be no flame or glowing which does not extinguish within 30 s after removing the glo
33、wwire; there shall be no ignition of the tissue paper or scorching of the board. 4.2.3.3 Resistance to salt and sulfur dioxide laden atmospheres When armour glands, other than armour glands made wholly of stainless steel or brass, which are claimed to be resistant to salt and sulfur dioxide laden at
34、mospheres, are tested in accordance with BS EN 50262:1999, 12.3, the glands shall show no visible signs of corrosion. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:41:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-1:2005 4 BSI 21 February 2005 5 Test samples, test conditions and t
35、est schedule 5.1 General Unless otherwise specified for a particular test, tests shall be carried out on armour glands assembled and mounted in accordance with the manufacturers instructions. There shall be no adjustment between or during the tests. NOTERe-mounting of the sample between tests is not
36、 considered to be adjustment. 5.2 Temperature Unless otherwise specified for a particular test, the tests shall be carried out at an ambient temperature of (20 5) C. 5.3 Number of samples Unless otherwise specified for a particular test, three samples shall be subjected to the relevant tests in acco
37、rdance with Table 2. When a range of armour glands is being tested which differ only in size, three samples each of the largest and the smallest sizes and one sample each of all other sizes of the range shall be subjected to the relevant tests. 5.4 Test schedule The tests shall be carried out in acc
38、ordance with the schedule given in Table 2. Table 2 Test samples and test schedule Sample group Test sequenceSubclause AMarking Equipotential bonding Resistance to abnormal heat 6.1 4.2.2.1 4.2.3.2 BCable retention (minimum armour thickness) Resistance to impact Ingress protection 4.2.1.1 4.2.1.2 4.
39、2.3.1 CCable retention (maximum armour thickness) Resistance to excess torque Ingress protection 4.2.1.1 4.2.1.3 4.2.3.1 DElectrical connection to metallic layer(s) of cable4.2.2.2 ECable retention (minimum and maximum armour thickness) Protective connection to earth 4.2.1.1 4.2.2.4 FInsulation resi
40、stance4.2.2.3 GResistance to salt and sulfur dioxide laden atmospheres4.2.3.3 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:41:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6121-1:2005 BSI 21 February 2005 5 5.5 Clearance holes in test apparatus Unless otherwise specified by the manuf
41、acturer or supplier, the diameter of clearance holes used in test apparatus shall be calculated in accordance with the following formula: where 5.6 Repeat testing in the event of failure If any single specimen fails a test, that test and any preceding one which might have influenced the results of t
42、he test shall be repeated. Repeat tests shall be made in the required sequence on a full set of three specimens of the relevant size. If all the specimens pass the repeat tests, the item shall be deemed to conform to the standard. If one specimen fails the repeat tests, the item shall be deemed not
43、to conform to the standard. 6 Marking and information 6.1 Marking Each armour gland shall be marked in accordance with BS EN 50262:1999, 7.1. Non-metric armour glands shall also be marked with the entry thread size and type. NOTEAn example of this would be: NPT. After testing in accordance with BS E
44、N 50262:1999, 7.2, the marking on the armour glands shall be legible when viewed with normal or corrected vision without magnification. After the glands have been subjected to testing in accordance with the schedule specified in 5.4, the marking shall remain legible. 6.2 Information The manufacturer
45、 shall provide with each package of armour glands an information sheet giving at least the following information: a) the cable acceptance range (i.e. the maximum cable diameter and the minimum and maximum armour thickness with which the gland can be used); b) the installation torque for glands that
46、are assembled by being screwed together; c) entry thread length; d) impact category; e) instructions for safe assembly of the armour gland; f) entry thread specification (if not metric); g) if the gland provides equipotential bonding; h) if the gland provides an electrical connection to metallic lay
47、er(s) of the cable other than the armour; i) if the gland has insulating characteristics; j) if the gland provides a protective connection to earth, and if so the category; k) the degree of ingress protection provided; l) if the gland is resistant to salt and sulfur dioxide laden atmospheres. NOTEAn
48、 example of item f) would be: ANSI/ASME B1.20.1:1983. dis the clearance hole diameter, in millimetres (mm); tis the maximum diameter of the entry thread, in millimetres (mm). 2 . 0 4 . 0 5 . 0 + += td Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 05:41:59 GMT+00:00 2006, Uncontrolled Copy,
49、(c) BSI BS 6121-1:2005 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendme