1、BRITISH STANDARD BS 6972:1988 Incorporating Amendment No. 1 Specification for General requirements for luminaire supporting couplers for domestic, light industrial and commercial use UDC 628.94/.95:628.973.1:628.977.1:621.3.027.7:001.4:614.8BS6972:1988 This British Standard, having been prepared und
2、er the direction of the Power Electrical Engineering Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 June 1988 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference PEL/4 Draft for comment 86/24101 DC
3、ISBN 0 580 16606 6 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Power Electrical Engineering Standards Committee (PEL/-) to Technical Committee PEL/4, upon which the following bodies were represented: ASTA Certification Services Assoc
4、iation of Consulting Engineers Association of Control Manufacturers TACRA (BEAMA Ltd.) Association of Manufacturers of Domestic Electrical Appliances British Electrical Systems Association (BEAMA Ltd.) British Electrotechnical Approvals Board British Plastics Federation Consumer Policy Committee of
5、BSI Decorative Lighting Association Department of Health and Social Security Department of Trade and Industry (Consumer Safety Unit, C A Division) ERA Technology Ltd. Electrical Contractors Association Electrical Installation Equipment Manufacturers Association (BEAMA Ltd.) Electrical Power Engineer
6、s Association Electricity Supply Industry in England and Wales Institution of Electrical Engineers Lighting Industry Federation Ltd. National Inspection Council for Electrical Installation Contracting Amendments issued since publication Amd. No. Date of issue Comments 9181 November 1996 Indicated by
7、 a sideline in the marginBS6972:1988 BSI 03-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Conditions of use 1 3 Definitions 1 4 General requirements 2 5 Requirements for type testing 2 6 Rating 3 7 Classification 3 8 Marking and information 3 9 Dimensions 4 1
8、0 Creepage distances and clearances 4 11 Accessibility of live parts 4 12 Provision for earthing 4 13 Construction 5 14 Terminals and terminations 6 15 Screws, current-carrying parts and connections 7 16 Provision for cables and cords 8 17 Resistance to ageing 8 18 Resistance to moisture and humidit
9、y 9 19 Insulation resistance and electric strength 9 20 Temperature rise 9 21 Load making and breaking 10 22 Mechanical strength 10 23 Resistance to heat 12 24 Resistance to abnormal heat and to fire 13 25 Resistance to tracking 13 26 Resistance to excessive residual stresses and to rusting 13 Figur
10、e 1 Pendulum impact test apparatus 15 Figure 2 Tumbling barrel 17 Figure 3 Application of test load 18 Figure 4 Ball pressure test apparatus 19 Table 1 Creepage distances and clearances 5 Table 2 Screw torque values 7 Table 3 Application of glow-wire test 13 Publications referred to Inside back cove
11、rBS6972:1988 ii BSI 03-1999 Foreword This British Standard has been prepared under the direction of the Power Electrical Engineering Standards Committee. The growing use of luminaire supporting couplers (LSCs) in place of ceiling roses led to a request for standards to ensure the safety and intercha
12、ngeability of such accessories. This standard has been based on drafts submitted by the Decorative Lighting Association and the Electrical Installation Equipment Manufacturers Association, and gives general requirements for the construction of LSC plugs and LSC outlets with particular reference to s
13、afety. A separate British Standard, BS 7001, specifies dimensions for interchangeability and safety of standardized LSC plugs and LSC outlets. BS7001 calls up the general requirements given in this standard. In the interests of interchangeability between LSCs made by different manufacturers, it is r
14、ecommended that new designs should comply with BS7001. Product certification. Users of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with
15、assessment of a suppliers quality systems against the appropriate Part of BSENISO9000. Enquiries as to the availability of third party certification schemes may be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should
16、consider approaching an appropriate body from the list of Association members. 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 co
17、nfer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 20, 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 indicat
18、ed in the amendment table on theinside front cover.BS6972:1988 BSI 03-1999 1 1 Scope This British Standard specifies requirements for luminaire supporting couplers (LSCs) comprising LSC plugs and LSC outlets for use in final circuits rated at not more than 16 A, where the supply voltage does not exc
19、eed250Va.c. and the electrical load connected to any one LSC plug does not exceed6A. The requirements specified in this standard have particular reference to safety in normal use. LSC outlets are intended for use with cables complying with BS6004 or BS6007, having copper conductors. LSC plugs which
20、are not integral with a luminaire are intended for use with flexible cords complying with BS6141 or BS6500, having a cross-sectional area from0.5mm 2to1.0mm 2 . The standard is applicable to LSCs intended for either: a) the mechanical and electrical connection and disconnection of luminaires suspend
21、ed by flexible cords up to a maximum supported load of5kg; or b) the mechanical and electrical connection and disconnection and direct mechanical support of luminaires, i.e. other than by a flexible cord. The standard is not applicable to LSC plugs and LSC outlets intended to be used on extra low vo
22、ltage (ELV) supplies. NOTE 1LSC outlets complying with this standard may be regarded as lighting outlets in accordance with the provisions of Appendix4 of the 15th edition of the Regulations for Electrical Installations 1) . NOTE 2The titles of the publications referred to in this standard are liste
23、d on the inside back cover. 2 Conditions of use LSC plugs and LSC outlets shall be suitable for use under the following conditions: a) an ambient temperature having a peak value not exceeding 40C, with an average value not exceeding35C in a period of24h, but not subject to exposure to direct radiati
24、on from the sun or any other source of heat likely to raise the temperature above the specified ambient temperature; NOTEThe effect of the heat generated by the luminaire may affect the ambient temperature local to the coupler but this is not included in the term “any other source of heat” seec). b)
25、 an ambient temperature having a value not less than 5C; c) a temperature not exceeding70C at the terminals of the LSC outlet including the effect of heat generated by the luminaire and the passage of current; d) an altitude not exceeding 2000m above sea level; e) an atmosphere not subject to excess
26、ive pollution by smoke, chemical fumes, salt laden spray, prolonged periods of high humidity or other abnormal conditions. 3 Definitions For the purposes of this British Standard the following definitions apply. 3.1 luminaire supporting coupler (LSC) a means, comprising an LSC outlet and an LSC plug
27、, providing mechanical support for a luminaire and the electrical connection to and disconnection from a fixed wiring installation 3.2 LSC outlet that part of an LSC which is intended for fixed mounting and for connection to a fixed wiring installation 3.3 surface-type LSC outlet an LSC outlet provi
28、ded with a seating surface such that when mounted as intended it projects wholly outside the surface on which it is mounted 3.4 flush-type LSC outlet an LSC outlet intended for mounting with its base partially or completely recessed into a box or enclosure 3.5 LSC plug that part of an LSC which is i
29、ntended for the electrical connection of a luminaire to an LSC outlet 3.6 independent LSC plug an LSC plug which is intended to be attached to the flexible cable or cord of a luminaire 3.7 rewireable independent LSC plug an independent LSC plug for electrical connection to the flexible cable or cord
30、 of a luminaire without the use of special purpose tools 1) Published by the Institution of Electrical Engineers.BS6972:1988 2 BSI 03-1999 3.8 non-rewireable independent LSC plug an independent LSC plug that forms a constructional unit with the flexible cord such that the cord cannot be separated fr
31、om the plug either by hand or by using tools without making the unit permanently useless NOTEAssemblies having insulating materials moulded around pre-assembled parts or an enclosure of insulating material formed by parts welded or bonded together are examples. 3.9 component LSC plug an LSC plug man
32、ufactured as a separate item and intended to form part of the body of a luminaire after incorporation in the luminaire by a luminaire manufacturer 3.10 integral LSC plug an LSC plug manufactured as an integral part of the body of a luminaire 3.11 terminal a component including screws or other device
33、s for connecting electrical conductors 3.12 supply terminals terminals intended to accommodate conductors of the fixed wiring 3.13 loop terminal a supply terminal intended solely for the interconnection of live conductors 3.14 live parts current carrying parts and those metal parts connected to or i
34、n contact with them during normal use NOTEEarthing terminals are not considered to be current carrying parts. 3.15 decorative cover an optional component which may be mechanically attached to an LSC outlet to provide cosmetic decoration when a luminaire is not connected 3.16 touchable surface any su
35、rface which can be touched by Test finger 1 of BS3042 after removal of any part which can be removed without use of tools 3.17 type test a test, or series of tests, conducted on a sample, consisting of one or more similar items, to determine whether or not an LSC, LSC outlet or LSC plug, manufacture
36、d to the same design as the sample, is capable of complying with the requirements of the specification 4 General requirements LSC plugs and LSC outlets shall be so designed and constructed that, in normal use, they function reliably and without danger to persons or surroundings, and are capable of m
37、eeting all the relevant requirements and tests specified in this standard. NOTEWhere tolerances are not specified in this standard the values are to be regarded as nominal. 5 Requirements for type testing 5.1 A manufacturer or responsible vendor who claims compliance with this standard shall submit
38、a representative sample to the relevant tests of this standard in the order specified in5.3. All tests are type tests. The tests may be made by the manufacturer, or the responsible vendor, or may be made on his behalf by a competent testing laboratory or certification authority. The results of such
39、tests shall be recorded and retained for reference and inspection. Where an LSC plug or LSC outlet alone is submitted for test it shall be tested using a corresponding LSC outlet or LSC plug complying with this standard. 5.2 Unless otherwise specified in this standard, LSC plugs and LSC outlets shal
40、l be tested as delivered and installed, as in normal use, at an ambient temperature of20 5C. The ambient temperature shall be measured at a distance of1m from the test specimen and in the same horizontal plane as the specimen. Integral LSC plugs shall be tested when assembled or incorporated in the
41、corresponding section of a luminaire. 5.3 A total sample of nine LSC plugs and/or LSC outlets shall be submitted to inspection and tests in the following order of clauses: a) three specimens: clauses4 to16 inclusive (inspection only); b) three specimens: clauses11 to22 inclusive, followed by a repea
42、t test of clause20 (general tests); c) three specimens: clauses23 to26 inclusive (material tests).BS6972:1988 BSI 03-1999 3 5.4 If no specimen fails in the tests specified in5.3, then products of that type shall be deemed to comply with this standard. If one specimen fails in any individual test, or
43、 series of tests, specified in5.3, then products of that type shall be deemed to have failed to comply with this standard, unless it can be shown that the specimen was not representative of normal design or manufacture, in which case a separate set of three specimens shall be submitted to the releva
44、nt test, or series of tests, specified in5.3. If no specimen fails in this retest then products of that type shall be deemed to comply with this standard. If more than one specimen fails in the tests specified in5.3, then products of that type shall be deemed not to comply with this standard. 6 Rati
45、ng LSC plugs and LSC outlets shall have a rated voltage of250Va.c. and a rated current not exceeding6A. NOTEBS 7001 specifies that the rating of the LSC outlet shall be 6A. 6.1 Compliance shall be checked by inspection of the marking and tests described in this standard. 7 Classification LSC outlets
46、 shall be classified as follows. a) According to the position of mounting as: 1) wall; or 2) ceiling; or 3) wall/ceiling. b) According to the method of mounting as: 1) surface-type; or 2) flush-type. c) According to the current-carrying terminal arrangements as: 1) having provision for the connectio
47、n of loop wiring; 2) having no provision for the connection of loop wiring. 8 Marking and information 8.1 LSC outlets shall be marked with the following information: a) the name or trademark of the manufacturer or responsible vendor; b) the number of this British Standard, i.e.BS6972 2) ; NOTEIf the
48、 LSC outlet complies with BS7001, marking with BS6972 may be omitted. c) the rated current; d) the rated voltage, i.e.250V; e) symbol for alternating current; f) terminal identification, i.e. line, neutral, earth, loop, etc.; g) maximum permissible supported load in kilograms; h) a symbol indicating
49、 that the outlet is intended to be used with luminaires. The marking specified in g) and h) shall be visible after installation but not necessarily after insertion of the LSC plug. 8.2 Independent LSC plugs shall be marked with the following information: a) the name or trademark of the manufacturer or responsible vendor; b) the number of this British Standard, i.e.BS6972 2) ; NOTEIf the LSC plug complies with BS 7001, marking with BS6972 may be omitted. c) the rated current, d) the rated voltage, i.e.250V; e) terminal identification, i.e.line, neutral,
