1、BRITISH STANDARDBS 7895:1997Incorporating Amendments Nos. 1 and 2Specification for bayonet lampholders with enhanced safetyICS 29.140.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g3
2、8g50g51g60g53g44g42g43g55g3g47g36g58BS 7895:1997This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 May 1997 BSI 18 October 2005The following BSI references relate t
3、o the work on this standard:Committee reference CPL/34/2Draft for comment 96/209809 DCISBN 0 580 27408 XCommittees responsible for this British StandardThe preparation of this British Standard was entrusted by Technical Committee CPL/34, Lamps and related equipment, to Subcommittee CPL/34/2, Lamp ca
4、ps and holders, upon which the following bodies were represented: British Industrial Ceramic Manufacturers Association British Lighting Association for the Preparation of Standards (Britlaps) Consumer Policy Committee of BSI Department of Trade and Industry (Consumer Safety Unit, CA Division) Electr
5、ical Installation Equipment Manufacturers Association (BEAMA Ltd.) Institution of Electrical Engineers Lighting Industry Federation Ltd. Society of Motor Manufacturers and Traders Limited The Lighting Association Amendments issued since publicationAmd. No. Date Comments9884 March 1998 15970 17 Octob
6、er 2005 References updatedBS 7895:1997 BSI 18 October 2005iContentsPageCommittees responsible Inside front coverForeword iiSpecification1 General 12 Definitions 13 General requirements 14 General conditions for tests 25 Standard ratings 26 Classification 27 Marking 28 Dimensions 29 Protection agains
7、t electric shock 210 Terminals 311 Provision for earthing 312 Construction 313 Switched lampholders 514 Moisture resistance, insulation resistance and electrical strength 515 Mechanical strength 516 Screws, current-carrying parts and connections 517 Creepage distances and clearances 518 General resi
8、stance to heat 519 Resistance to heat, fire and tracking 520 Resistance to excessive residual stresses (season cracking) and to rusting 521 Endurance 5Annex A (normative) 8Annex ZA (normative) 8Annex ZB (normative) 8List of references 9Figure 1 Test cap B15d 6Figure 2 Test cap B22d 7Table 1 Values f
9、or cord grip tests 4BS 7895:1997ii BSI 18 October 2005ForewordThis British Standard has been prepared by Subcommittee CPL/34/2. Lampholders with a bayonet fitting and with enhanced safety features are used mainly in the UK. This standard is to be read in conjunction with BS EN 61184:1997 Bayonet lam
10、pholders, which it supplements and modifies. All references to lampholders in this standard are to lampholders with enhanced safety. Safety requirements ensure that electrical equipment constructed in accordance with these requirements does not endanger the safety of persons, domestic animals or pro
11、perty when properly installed, maintained and used in applications for which it is intended. This British Standard has been published to specify requirements and tests for enhanced safety lampholders, which are not included in BS EN 61184 and BS EN 60061-4. Compliance with a British Standard does no
12、t of itself confer immunity from legal obligations. Summary of pagesThis document comprises a front cover, an inside front cover, pages 1 to 9 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.BS 7895:1997 BSI 18 October 200511 General 1
13、.1 Scope This British Standard specifies requirements, including safety and testing requirements for bayonet lampholders B15d and B22d with enhanced safety for connection of general lighting service (GLS) lamps and semi-luminaires to a supply voltage not exceeding 250 V. This British Standard also a
14、pplies so far as is reasonable to such lampholders that are wholly or partly integral with a luminaire or intended to be built into appliances. NOTE 1 B15 denotes the cap/holder fit as defined in sheet 7004-11 of BS EN 60061-1:1997 and sheet 7005-16 of BS EN 60061-2:1997 with the corresponding gauge
15、s. NOTE 2 B22 denotes the cap/holder fit as defined in sheet 7004-10 of BS EN 60061-1:1997 and sheet 7005-10 of BS EN 60061-2:1997 with the corresponding gauges. 1.2 References 1.2.1 Normative references This British Standard incorporates, by dated or undated reference, provisions from other publica
16、tions. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publications apply to this British Standard on
17、ly when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 1.2.2 Informative references This British Standard refers to other publications that provide information or guidance. Editions of
18、 these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 2 Definitions For the purposes of this British Standard the definitions given in BS EN 61184:1997 apply, together with the addition of 2.21 and
19、2.22. Addition: 2.21 lampholder with enhanced safety a lampholder with an integral safety device operated by the fitting or by the removal of a lamp, and which either controls the supply to the lamp or restricts access to live partsAddition: 2.22switched lampholder with enhanced safety a lampholder
20、with enhanced safety provided with a manually operated integral switch to control the supply to a lamp 3 General requirements Replacement: Lampholders with enhanced safety shall be so designed and constructed that, in normal use, their performance is reliable and with minimal risk of danger to the u
21、ser or surroundings. Compliance shall be checked by carrying out all the relevant tests specified. BS 7895:19972 BSI 18 October 20054 General conditions for tests BS EN 61184:1997, Clause 4 shall apply, subject to the following modifications to 4.3. Modification: 4.3 All inspections and tests shall
22、be carried out on a total of: a) 11 specimens for unswitched lampholders; or b) 14 specimens for switched lampholders; in the order of the clauses as follows: 1) 3 specimens: Clauses 3 to 12;2) 3 specimens: Clauses 14 to 17; 3) 3 specimens: Clause 13 (switched lampholders only); 4) 2 specimens: Clau
23、ses 19 and 20; 5) 3 specimens: Clauses 14.2, 21.1, 18, 21.2. 5 Standard ratings BS EN 61184:1997, Clause 5 shall apply. 6 Classification BS EN 61184:1997, Clause 6 shall apply. 7 Marking BS EN 61184:1997, Clause 7 shall apply. 8 Dimensions BS EN 61184:1997, Clause 8 shall apply. 9 Protection against
24、 electric shock BS EN 61184:1997, Clause 9 shall apply subject to the following modification to 9.1. Modification: 9.1 Lampholders shall be so designed that, when fully assembled, live parts of the lampholder are not accessible when the lampholder is fitted with the testing device shown in BS EN 611
25、84:1997, Figure 7. In addition lampholders shall be so designed that, when fully assembled and without the testing device shown in BS EN 61184:1997, Figure 7 fitted, live parts of the lampholder are not accessible. For independent and enclosed lampholders compliance shall be checked by the applicati
26、on of the standard test finger in accordance with BS EN 60529:1992. Independent lampholders and enclosed lampholders shall be mounted as in normal use, e.g. on a threaded support or on a supporting surface or the like. Unenclosed lampholders shall be tested only after appropriate installation in a l
27、uminaire or other additional enclosure. NOTE 1 For these reasons unenclosed lampholders should not be made available for retail sale.The test finger shall be applied in every possible position with a force of 10 N, an electrical indicator being used to show contact with live parts. NOTE 2 It is reco
28、mmended that a voltage of not less than 40 V is used. BS 7895:1997 BSI 18 October 20053Lampholders which incorporate a shutter shall be so designed that, when fully assembled and without the testing device shown in BS EN 61184:1997, Figure 7 fitted, live parts of the lampholder are not accessible. T
29、he test finger shall be applied in every possible position with a force of 25 N, an electrical indicator being used to show contact with live parts. NOTE 3 It is recommended that a voltage of not less than 40 V is used. NOTE 4 The use of a skirt or protective shield (see BS EN 61184:1997, 2.6 and 2.
30、6.1) is optional. An example of a protective shield is shown in Figure 9 of BS EN 61184:1995. 10 Terminals BS EN 61184:1997, Clause 10 shall apply subject to the following modification to 10.4. Modification: 10.4 Terminals shall be so located that, after correct fitting of the wires, there is no ris
31、k of accidental contact between live parts and accessible metal parts or any integral moving parts before, during and after operation. Compliance shall be checked by inspection and by the following test. The insulation shall be removed over a length of 4 mm from the end of a flexible conductor havin
32、g the minimum nominal cross-sectional area specified in 10.2. One wire of the stranded conductor shall be left free and the remainder shall be fully inserted into and clamped in the terminal of the lampholder mounted and installed as in normal use (locking screws tightened etc.). The free wire shall
33、 be bent, without tearing the insulation back, in every possible direction, but without making sharp bends around barriers. The free wire of a conductor connected to a live terminal shall not touch any metal part that is accessible or any integral moving parts, and that of a conductor connected to a
34、n earthing terminal shall not touch any live part. If necessary, the test shall be repeated with the free wire in another position. NOTE The prohibition against making sharp bends around barriers does not imply that the free wire shall be kept straight during the test. Sharp bends can be made if it
35、is considered likely that such bends can occur during the normal assembly of the lampholder. 11 Provision for earthing BS EN 61184:1997, Clause 11 shall apply. 12 Construction BS EN 61184:1997, Clause 12 shall apply subject to the following modification to 12.8 and the addition of 12.14. Modificatio
36、n: 12.8 Cord grip lampholders shall be provided with a device allowing the lampholder to be so fixed to a flexible cord that the conductors are relieved from strain, including twisting, where they are connected to terminals. NOTE Labyrinth type cord restraints, that do not grip the outer covering of
37、 the cord, can be utilised provided they meet the test requirements in this clause. It shall be clear how the relief from strain and the prevention of twisting is intended to be effected. It shall not be possible to push the cord into the lampholder to such an extent that the cord is subjected to un
38、due mechanical or thermal stress. Tying the cord into a knot or tying the end with string shall not be permitted. The device shall be of insulating material or shall have a fixed insulating lining, to ensure that an insulation fault on the cord cannot make accessible metal parts live. The design sha
39、ll be such that the device complies with the following requirements. a) It shall have at least one part fixed to or integral with the lampholder. b) It shall be suitable for different types of flexible cords that can be connected to the lampholder. BS 7895:19974 BSI 18 October 2005c) It shall not ex
40、ert excessive pressure on the cord. d) It shall be unlikely to be damaged when it is tightened or loosened during normal use. The device shall be suitable for flexible cords of any one of the following types: 1) BS 6500:2000, Table 11; 2) HO5RR-F; 3) HO3VV-F; 4) HO3VVH2-F. Compliance shall be checke
41、d by inspection and by the following test. The lampholder shall be fitted with one of the flexible cords mentioned above, the device for strain and twist relief being appropriately used. The conductors shall be introduced into the terminals and the terminal screws shall be slightly tightened so that
42、 the conductors cannot easily change their position. After this preparation it shall not be possible to push the cord further into the lampholder. The flexible cord shall be subjected 100 times to a pull of the appropriate value shown in Table 1 for a duration of 1 s each. The pull shall not be appl
43、ied in jerks. Immediately afterwards, the flexible cord shall be subjected for a period of 1 min to a torque as specified in Table 1, applied as close as is practicable to the cord entry in the most unfavourable direction. Table 1 Values for cord grip testsThe lampholders shall be tested using each
44、of the appropriate types of cord, as specified in this clause in accordance with BS 6500:2000 as applicable. The test shall be made first with the conductors of the smallest cross-sectional area specified in 10.2. The next test shall be made with conductors of either the largest cross-sectional area
45、 allowed by the suspending device or the largest cross-sectional area specified in 10.2, whichever is smaller. During the test, no damage shall be caused to the flexible cord by the device for strain and twist relief. At the end of the test, the cord shall not have been displaced by more than 2 mm,
46、and the ends of the conductors shall not have been noticeably displaced in the terminals. In order to enable any displacement to be measured, before starting the test a mark shall be made on the cord under strain at a distance of approximately 20 mm from the strain-relieving device. At the end of th
47、e test, the displacement of this mark in relation to the strain-relieving device, is measured while the cord is still under strain. Addition: 12.14 The lampholder shall be so designed that misuse of the integral device cannot occur accidentally. Compliance shall be checked by inspection and manual t
48、est. Total nominal cross-sectional area of all conductors together Pull Torque mm2 N Nm Up to and including 1.5 60 0.15 Over 1.5 up to and including 3 60 0.25 Over 3 up to and including 5 80 0.35 Over 5 up to and including 8 120 0.35 BS 7895:1997 BSI 18 October 2005513 Switched lampholders BS EN 611
49、84:1997, Clause 13 shall apply. 14 Moisture resistance, insulation resistance and electrical strength BS EN 61184:1997, Clause 14 shall apply. 15 Mechanical strength BS EN 61184:1997, Clause 15 shall apply. 16 Screws, current-carrying parts and connections BS EN 61184:1997, Clause 16 shall apply. 17 Creepage distances and clearances BS EN 61184:1997, Clause 17 shall apply. 18 General resistance to heat BS EN 61184:1997, Clause 18 shall apply. 19 Resistance to heat, fire and tracking BS EN 61184:1997, Clause 19 shall apply. 20 Resistance to excessive residual stresses (
