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1、BRITISH STANDARD AEROSPACE SERIES BS G 200:1967 Incorporating Amendment No. 1 Specification for Miniature lever-operated manual switches UDC 629.13.066:621.316.542.1 514.4 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:35:04 GMT+00:00 2006, Uncontrolled Copy
2、, (c) BSI BS G 200:1967 This British Standard, having been approved by the Aerospace Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council of the Institution on 21 August 1967 BSI 01-2000 The followin
3、g BSI references relate to the work on this standard: Committee reference ACE/43 Draft for comment 66/6162 ISBN 0 580 04507 2 Foreword This British Standard has been prepared as a result of enquiries within the aircraft industry which showed a need for a switch of smaller size and rating than those
4、in BS G 194 yet larger than the miniature switches complying with the American specification MIL-S-8834. The specification has been based on BS G 194, “Lever-operated manual switches for aircraft”, and, in addition to specifying performance requirements, defines preferred dimensions and fixing holes
5、. Switches are classified according to the environmental conditions for which they are suitable. The tests, which are grouped as type tests, production tests and quality tests, include a test of the force required to operate the switch, and recommendations as to suitable tests for verifying the serv
6、iceability of the switches after storage or use. This standard makes reference to the following British Standards: BS 2G 100, General requirements for electrical equipment and indicating instruments for aircraft. BS G 177, Nyvin type electrical cables for aircraft. BS G 178, Crimped joints for gener
7、al purpose electrical cables for aircraft. BS SP 20, Panel type air filter elements for use with internal combustion engines and compressors on aircraft. BS 410, Test sieves. BS 580, Trichloroethylene. NOTEWhere metric equivalents are given, the figures in British units are to be regarded as the sta
8、ndard. The metric equivalents are approximate. More accurate conversions should be based on the tables in BS 350, “Conversion factors and tables”. Obsolescent (by Amendment No. 1) The need for the equipment covered by this British Standard has been reviewed and it has been decided that, in the inter
9、ests of rationalization, it should be regarded as obsolescent and not therefore used for new designs. The standard will be withdrawn in due course. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct
10、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 12 and a back cover. This standard has been updated (see copyright date) and may have h
11、ad amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.Date of issueComments 4303July 1983Indicated by a sideline in the margin Licensed Copy: London South Bank University, London South Bank University, Sat Dec
12、 09 02:35:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 200:1967 BSI 01-2000i Contents Page ForewordInside front cover 1General requirements1 1.1Scope1 1.2General1 1.3Rating1 1.4Declarations1 1.5Marking1 2Particular requirements2 2.1Operation2 2.2Construction2 2.3Dimensions2 2.4Environmental re
13、quirements2 3Tests3 3.1General3 Type tests 3.2Mechanical strength tests3 3.3Operating force test4 3.4Mechanical endurance tests4 3.5Voltage drop test4 3.6High voltage and insulation tests4 3.7Temperature rise test4 3.8Electrical endurance tests4 3.9Overload tests5 3.10 Short-circuit tests5 3.11 Vibr
14、ation test5 3.12 Acceleration test6 3.13 Climatic test6 3.14 Lever bush sealing test6 3.15 Switch sealing test6 3.16 Explosion-proofness6 3.17 Salt corrosion test6 3.18 Dust and sand test7 3.19 Fluid contamination tests7 3.20 Strip examination and report7 Production tests 3.21 Marking and operation7
15、 3.22 Operating force test7 3.23 Voltage drop test7 3.24 High voltage and insulation tests7 Quality tests 3.25 Selection of samples7 3.26 Electrical endurance test7 3.27 Vibration test7 3.28 Lever bush sealing test7 3.29 Switch sealing test7 3.30 Strip examination and report7 Appendix A Type test sc
16、hedule8 Appendix B Serviceability tests9 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:35:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 200:1967 ii BSI 01-2000 Page Appendix C Salt corrosion test9 Appendix D Dust and sand test9 Appendix E Fluid contami
17、nation tests9 Figure 1 Envelope dimensions for miniature lever-operated manual switches10 Figure 2 Fixing holes and details of locating washer11 Figure 3 Typical test circuit for short-circuit test11 Figure 4 Measuring device for dust and sand test12 Licensed Copy: London South Bank University, Lond
18、on South Bank University, Sat Dec 09 02:35:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 200:1967 BSI 01-20001 1 General requirements 1.1 Scope This British Standard specifies the requirements for two classes of single-hole fixing, miniature lever-operated manual switches for use in nominal 28
19、V d.c. and 115/200 V three-phase, 400 cycle a.c. systems in aircraft. Class 1 switches are sealed and are suitable for higher altitude and wider temperature conditions than Class 2, which are sealed only at the lever entry. 1.2 General 1.2.1 The switch shall comply with the requirements of this Brit
20、ish Standard, those of BS 2G 100 and those of the relevant switch drawings. 1.2.2 The switch shall be suitable for either of the following temperature and altitude classifications: Class 1. Suitable for use at altitudes up to 70 000 ft (21 400 m) and for temperatures within the range 40 C to + 70 C;
21、 they should not suffer damage or deterioration when subjected to 65 C. Class 2. Suitable for use at altitudes up to 20 000 ft (6 100 m) and for occasional use at 60 000 ft (18 300 m), and for temperatures within the range 20 C to + 55 C; they should not suffer damage or deterioration when subjected
22、 to 40 C. 1.2.3 The switch shall be suitable for mounting through the panel from the rear and shall operate satisfactorily when mounted in any attitude. 1.2.4 The switch may be the two- or three-position type, with one or more poles: it may be self-retaining and/or spring return. It should preferabl
23、y be designed to allow the incorporation of integral locking of the lever in any or all positions. 1.2.5 The method of operation of the switch shall be by means of a single lever, moving in a plane at right angles to the mounting panel. The relationship of the lever positions to the keyway shall be
24、as shown in Figure 1, and the relationship of the terminal numbers to the lever positions shall be as stated in the individual specification1). 1.2.6 The switch terminals shall be identified by number in the sequence shown in the individual specification1). 1.3 Rating 1.3.1 Voltage. The switch shall
25、 operate in nominal 28 V d.c. and 115/200 V three-phase, 400 cycle a.c. systems having the characteristics specified in BS 2G 100-3. In addition, the switch shall be suitable for use at voltages down to 4 V d.c. or a.c. 1.3.2 Current. The switches shall be suitable for all of the following normal cu
26、rrent ratings: 1) 5 A resistive load 2) 3 A inductive load 3) 2.5 A tungsten filament lamp load (28 V d.c.) 4) 1.5 A tungsten filament lamp load (200 V a.c.) In addition, unless otherwise declared, the switch shall be suitable for operation at 100 mA resistive load at voltages down to 4 V. The induc
27、tive loads shall be as follows: 28 V d.c. 3 A 40 mH 115/200 V a.c. 3 A 0.70 power factor lagging. 1.4 Declarations In addition to the declarations required by BS 2G 100-1, the manufacturer shall declare: 1) The classification. 2) The limits of the forces necessary to operate the switch to any positi
28、on. 3) The system of batching used for quality test sampling. 4) The switch operation relative to the lever position and the terminal numbering. 1.5 Marking 1.5.1 In addition to the terminal numbering, the following minimum information shall be clearly and indelibly marked on each switch: 1) BS G 20
29、0 and classification. 2) The manufacturers name or identification. 3) The manufacturers type number. 4) “5 A res.” (i.e. res. = resistive). 5) “28 V d.c./200 V a.c.” 1.5.2 The application of some identifying mark to indicate the date of manufacture is recommended. 1) Attention is drawn to the fact t
30、hat it has not been found practicable to standardize these features. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:35:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 200:1967 2 BSI 01-2000 2 Particular requirements 2.1 Operation 2.1.1 The switch lever ac
31、tion shall be positive and it shall not be possible during normal usage for the lever to stay in any position other than a fully-operated position. The operation of the switch shall not be affected adversely by the speed of movement of the lever. 2.1.2 It shall not be possible to rotate the lever ab
32、out its longitudinal axis. 2.1.3 The angular movement of the lever should preferably be 20 2 from the central position, but angular movements up to 23 2 are acceptable. 2.1.4 There shall be at least a 10 movement of the lever before switching occurs. 2.1.5 The lever shall be capable of withstanding
33、without damage or distortion a force of 20 lbf (9 kgf) applied steadily in the directions specified in 3.2.2. 2.2 Construction 2.2.1 The lever, including any metal inserts, shall be insulated from all live parts. 2.2.2 The force required to operate the switch shall be not less than 1 lbf (0.45 kgf)
34、and not more than 10 lbf (4.5 kgf). For each operation, of a particular type of switch, the maximum force shall not exceed the minimum force by more than 100 %. The manufacturer shall declare the maximum and minimum values of the force for each operation appropriate to each type of switch. 2.2.3 Whe
35、re locking of the lever is provided, it shall be positive and automatic, and the lock shall be released by raising the lever against a spring force of 1.5 lbf to 5 lbf (0.7 kgf to 2.3 kgf). 2.2.4 The exposed portion of the switch shall have a non-glaring finish. 2.2.5 The switch shall be sealed at t
36、he point of entry of the lever to prevent the ingress of liquids or foreign matter. In addition, the bodies of Class 1 switches shall be sealed to the standard required by the test in 3.15. 2.2.6 Terminations shall be by screws, each capable of accepting two crimped tag-type terminations of approved
37、 design. The terminal threads shall be 440 UNC. Terminals shall have a mechanical strength adequate to satisfy the requirements of 3.2.1. 2.2.7 The terminal arrangement shall be such that wiring access is still provided when the switches are mounted in rows at minimum spacing. Means shall be provide
38、d to avoid accidental contact or short-circuiting between adjacent terminals. The switches shall be suitable for close mounting and shall not constitute an electrical hazard if the side faces of adjacent switches touch one another. 2.2.8 The switch shall be mounted by means of a 15/32-28UNS threaded
39、 bush with a locating keyway in the plane of movement of the lever. Two hexagon mounting nuts, one locating washer and one internal shakeproof washer shall be provided with each switch. 2.2.9 The switch shall be so constructed that it is suitable for performing at least 50 000 operations at maximum
40、rated current and voltage. 2.2.10 The switch contacts, including common internal connections, should be self-wiping on all switched contact positions. 2.2.11 The lever mechanism should incorporate a positive contact opening action in order to assist in breaking a tack weld. 2.2.12 The appropriate co
41、ntacts only shall operate when the lever is suddenly released from a spring-loaded position. 2.2.13 Springs should be of the compression type. 2.3 Dimensions The envelope dimensions (including terminals) and the fixing arrangements for the switches shall be as shown in Figure 1 and Figure 2. 2.4 Env
42、ironmental requirements 2.4.1 The switch shall comply with the relevant requirements of BS 2G 100-2 in respect of mechanical and physical environmental conditions. Its grading for vibration, climatic and acceleration performance shall be: 2.4.2 Class 1 switches shall also comply with the requirement
43、s of 3.17, 3.18 and 3.19 of this British Standard in respect of resistance to salt corrosion, dust and sand, and fluid contamination. 2.4.3 Class 2 switches shall comply with the requirements of BS 2G 100-2 for explosion-proof equipment. Vibration:Grade B Acceleration:Grade C, Class 1A (i) and crash
44、 Grade E, Class 11. Climatic:Class 1 or Class 2 as declared by the manufacturer. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:35:04 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS G 200:1967 BSI 01-20003 3 Tests 3.1 General 3.1.1 Nature and order of tests. T
45、ests shall be made to prove compliance with the relevant requirements of this British Standard. It is not intended or recommended that complete tests shall be made on every switch supplied. Three kinds of tests, therefore, are specified as follows: 1) Type tests (3.2 to 3.20). Type tests shall be ma
46、de on switches which have previously passed the production tests. For the purposes of this British Standard, switches of single-pole, double-pole and three-pole construction are considered as basic types. Each basic type of switch shall be subjected to type tests in accordance with the schedule in A
47、ppendix A. The environmental tests described in 3.17, 3.18 and 3.19 need only be applied to one basic type of switch at the discretion of the Approving Authority. It is not intended that variants of a basic type of switch shall be subjected to all of the tests: the extent of the type tests on such s
48、witches shall be agreed between the manufacturer and the Approving Authority.2) Specified type tests may be required by the Approving Authority to be repeated after the introduction of a major modification. 2) Production tests (3.21 to 3.24). Production tests shall be performed on every switch in th
49、e order stated. 3) Quality tests (3.26 to 3.29). Quality tests shall be performed on samples selected as specified in 3.25. Minimum tests recommended to verify the service-ability of switches after storage or use are indicated in Appendix B. 3.1.2 Test conditions. All tests specified at a.c. voltages relate to 200 V (line to line) for multi-pole switches, and to 115 V (phase) for single-pole switches. All electrical tests shall be performed with the switch connected on each side by Size 20 copper cored cables complying with BS G 117. Except for
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