1、BRITISH STANDARD BS 6121-1:2005 Mechanical cable glands Part 1: Armour glands Requirements and test methods ICS 21.140 BS 6121-1:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 21 February 2005 BSI 21 February 2005 First published as BS
2、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 reference GEL/20/11/1 Draft for comment 98/263249 DC ISBN 0 580 45374 X Committees responsible for this British
3、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 represented: BEAMA Ltd. Council for Electrical Equipment BEAMA Installation Ltd. British Approvals Service f
4、or Cables British Cables Association Gland Manufacturers Technical Committee Co-opted members Amendments issued since publication Amd. No. Date CommentsBS 6121-1:2005 BSI 21 February 2005 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Normative references 1 3T e
5、 r m s a n d d e f i n i t i o n s 1 4 Requirements 1 5 Test samples, test conditions and test schedule 4 6 Marking and information 5 Table 1 Forces for cable retention test 2 Table 2 Test samples and test schedule 4BS 6121-1:2005 ii BSI 21 February 2005 Foreword This part of BS 6121 has been prepar
6、ed by Subcommittee 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 Together with BS EN 50262:1999, it supersedes BS 6121-1:1989 which is withdrawn.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 n
7、ecessary provisions 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 c
8、over. The BSI copyright notice displayed in this document indicates when the document was last issued.BS 6121-1:2005 BSI 21 February 2005 1 1 Scope This part of BS 6121 specifies performance requirements for armour glands for use with armoured cables. 2 Normative references The following referenced
9、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 any amendments) applies. BS 21:1985 including Amendment 1:1990, Specification for pipe threads for
10、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 fittings for electrical wiring. BS EN 50262:1999 including Amendments 1:2001 and 2:2004, Cable gl
11、ands 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 including Amendments 1:1993 and 2:2000, Degrees of protection provided by enclosures (IP code). BS
12、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 Part 3: Deviations for constructional screw threads. ANSI/ASME B1.20.1:1983, Pipe threads, general
13、 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 armour of an armoured cable at the cable entry point of an enclosure and provides an electrical co
14、nnection 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, flexible cables or insulated conductors which pass through them in service. Those parts of an armour
15、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.BS 6121-1:2005 2 BSI 21 February 2005 4.1.2 Entry thread The entry thread of metric armour glands in
16、sizes up to M75 shall be constructed in accordance with BS EN 60423:1995, Table 1. For sizes greater 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 wit
17、h one of the following standards: BS 31:1940; BS EN ISO 228-1:2003; BS 21:1985; or shall be of 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 NOTE Armour glands specified in this standard are, in normal use, considered
18、 to be passive in respect of electromagnetic emission and immunity, so no requirements for these parameters are specified. 4.2.1 Mechanical performance NOTE The 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 speci
19、fied in Table 1, the cable shall not have moved relative to either of the glands by more than 3 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 th
20、e gland is suitable, as stated in the information supplied by the manufacturer, and being subjected 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
21、 visible signs of damage. 4.2.1.3 Resistance to excess torque For armour glands that are assembled 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 manuf
22、acturer, using a torque 1.5 times the installation torque given in the manufacturers instructions, the armour gland shall show no visible signs of damage. Cable diameter Force mm N 4 k8 6 4 0 8 k11 880 11 k16 1 280 16 k23 1 840 23 k31 2 480 31 k43 3 440 43 k55 4 400 55 k70 5 600 70 80D a a D is the
23、actual cable diameter in millimetres (mm).BS 6121-1:2005 BSI 21 February 2005 3 4.2.2 Electrical performance NOTE The 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 B
24、S 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 a
25、re 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
26、 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 M 7. 4.2.2.4
27、 Protective 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 requireme
28、nts 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 exhibi
29、t 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 NOTE The test sequence is given in 5.4. 4.2.3.1 Ingress protection Armour glands shall provide a minimum degree of pr
30、otection 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
31、glowwire; 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
32、 atmospheres, are tested in accordance with BS EN 50262:1999, 12.3, the glands shall show no visible signs of corrosion.BS 6121-1:2005 4 BSI 21 February 2005 5 Test samples, test conditions and test schedule 5.1 General Unless otherwise specified for a particular test, tests shall be carried out on
33、armour glands assembled and mounted in accordance with the manufacturers instructions. There shall be no adjustment between or during the tests. NOTE Re-mounting of the sample between tests is not considered to be adjustment. 5.2 Temperature Unless otherwise specified for a particular test, the test
34、s 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 accordance with Table 2. When a range of armour glands is being tested which differ only in size, three samp
35、les 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 accordance with the schedule given in Table 2. Table 2 Test samples and test schedule Sample group Test seq
36、uence Subclause AM a r k i n g Equipotential bonding Resistance to abnormal heat 6.1 4.2.2.1 4.2.3.2 B Cable retention (minimum armour thickness) Resistance to impact Ingress protection 4.2.1.1 4.2.1.2 4.2.3.1 C Cable retention (maximum armour thickness) Resistance to excess torque Ingress protectio
37、n 4.2.1.1 4.2.1.3 4.2.3.1 D Electrical connection to metallic layer(s) of cable 4.2.2.2 E Cable retention (minimum and maximum armour thickness) Protective connection to earth 4.2.1.1 4.2.2.4 F Insulation resistance 4.2.2.3 G Resistance to salt and sulfur dioxide laden atmospheres 4.2.3.3BS 6121-1:2
38、005 BSI 21 February 2005 5 5.5 Clearance holes in test apparatus Unless otherwise specified by the manufacturer 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 si
39、ngle specimen fails a test, that test and any preceding one which might have influenced the results of the 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
40、deemed to conform to the standard. If one specimen fails the repeat tests, the item shall be deemed not 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
41、 entry thread size and type. NOTE An example of this would be: NPT. After testing in accordance with BS EN 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 accordan
42、ce with the schedule specified in 5.4, the marking shall remain legible. 6.2 Information The manufacturer 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 an
43、d maximum armour thickness with which the gland can be used); b) the installation torque for glands that 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 th
44、e gland provides equipotential bonding; h) if the gland provides an electrical connection to metallic layer(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 ingre
45、ss protection provided; l) if the gland is resistant to salt and sulfur dioxide laden atmospheres. NOTE An example of item f) would be: ANSI/ASME B1.20.1:1983. d is the clearance hole diameter, in millimetres (mm); t is the maximum diameter of the entry thread, in millimetres (mm). 2 . 0 4 . 0 5 . 0
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