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1、BRITISH STANDARD CONFIRMED APRIL 1992 BS 1050:1984 Specification for Indicator lamps for use in telecommunication apparatus and for allied purposes UDC 621.32:621.39:654.1:654.912.8 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:52:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1050:198
2、4 This British Standard, having been prepared under the direction of the Electrical Illumination Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1984 BSI 10-1999 First published August 1942 First revision October 1945 Second revision Fe
3、bruary 1953 Third revision The following BSI references relate to the work on this standard: Committee reference LGL/6 Draft for comment 82/22699 DC ISBN 0 580 13968 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electrical Illuminati
4、on Standards Committee (LGL/-) to Technical Committee LGL/6 upon which the following bodies were represented: Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd) Bus and Coach Council Chartered Institution of Building Services Consumer Standards Advisory Committ
5、ee of BSI Electrical Contractors Association Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Institution of Public Lighting Engineers Lighting Industry Federation Ltd. London Transport Executive Ministry of Defence National Illumination Committe
6、e of Great Britain Society of Glass Technology Society of Motor Manufacturers and Traders Limited The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Department of Trade and Industry (Consumer Safety Unit, CCS Division) Electrical Installatio
7、n Equipment Manufacturers Association (BEAMA Ltd) National Coal Board Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:52:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1050:1984 BSI 10-1999i Contents Page Committees respon
8、sibleInside front cover Forewordii Section 1. General1 1Scope1 2Definitions1 3Marking2 4Requirements and tests for inspection, rating and life2 5Conditions of compliance3 Section 2. Standard lamp data sheets4 Table 1 Initial torque values2 Publications referred toInside back cover Licensed Copy: she
9、ffieldun sheffieldun, na, Fri Nov 24 07:52:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1050:1984 ii BSI 10-1999 Foreword This revision of this British Standard has been prepared under the direction of the Electrical Illumination Standards Committee and it supersedes BS 1050:1953 which is withdr
10、awn. The opportunity has been taken to widen the scope to include the majority of low voltage indicator lamps used in telecommunication apparatus and for allied purposes. The presentation of the information has been changed by specifying general requirements for these lamps in section 1 with section
11、 2 consisting of individual standard sheets giving details pertinent to each type of lamp. Previous editions of this standard covered only the range of tungsten filament visual indicator lamps then in use. A British Standard does not purport to include all the necessary provisions of a contract. Use
12、rs of British Standards are responsible for their 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 20, an inside back cover and
13、a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:52:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1050:1984
14、 BSI 10-19991 Section 1. General 1 Scope This British Standard specifies requirements for low voltage electric lamps operating up to and including 60 V used as visual indicators in telecommunication apparatus and allied purposes. Section 1 specifies general requirements. Section 2 consists of standa
15、rd lamp data sheets giving particular requirements for individual types of lamp. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the following definitions apply: 2.1 type lamps which have the
16、 same nominal dimensions, rated voltage and photometric and electrical characteristics 2.2 batch all the lamps of one type put forward at one time for test for compliance with this standard 2.3 inspection test quantity (ITQ) the number of lamps to be tested to decide whether a batch satisfies the vi
17、sual, mechanical and physical requirements of this standard 2.4 rating test quantity (RTQ) the number of lamps to be tested to decide whether a batch satisfies the requirements for initial readings 2.5 life test quantity (LTQ) the number of lamps to be tested to decide whether a batch satisfies the
18、requirements for life and for lumen maintenance 2.6 rated voltage the voltage for which the lamp is designed 2.7 initial readings the photometric and electrical measurements made at the end of the ageing period 2.8 lumen the unit of luminous flux. It is equal to the flux emitted within a solid angle
19、 of one steradian by a uniform point source of one candela 2.9 ageing the operation of a new lamp for a specified period in order to stabilize its photometric and electrical characteristics 2.10 life the number of hours the lamp operates to failure, or the number of hours assigned to the lamp under
20、the test conditions of this standard 2.11 rated life the life for which the lamp is designed when operated under the test conditions of this standard 2.12 average life the arithmetic mean of the lives of the lamps in the LTQ 2.13 life test voltage the voltage at which the life test is made NOTEThis
21、is the rated voltage unless otherwise stated on the appropriate standard sheet. 2.14 lumen maintenance (of an individual lamp) the lumen output of a lamp at a specified time in its life, expressed as a percentage of its initial lumen output 2.15 average lumen maintenance (of a test quantity) the ari
22、thmetic mean of the values of lumen maintenance for the individual lamps 2.16 standard deviation (of a group of measurements) the square root of the number obtained by adding the squares of the differences between the individual measurements and the average of the group and then dividing the sum by
23、the number of measurements 2.17 coefficient of variation (of a group of measurements) the standard deviation expressed as a percentage of the average of the group of measurements 2.18 light centre length (LCL) the distance from the centre of the rectangle which encloses the luminous section of the f
24、ilament to a fixed reference point on the cap NOTEThe reference point is indicated on the appropriate standard sheet. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:52:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1050:1984 2 BSI 10-1999 2.19 design test a test made on a sample for the
25、 purpose of checking compliance of the design of a type 3 Marking Each lamp shall be distinctly and durably marked with the following information except where specified on the appropriate standard sheet: a) the rated voltage; b) the manufacturers identifying code or mark; c) the lamps rated wattage
26、or manufacturers part number; NOTEAny other information agreed between customer and supplier may also be marked on the lamp. 4 Requirements and tests for inspection, rating and life 4.1 Test quantities 4.1.1 An ITQ of 35 lamps shall be selected, at random, from at least 10 containers, or from all th
27、e containers if there are less than 10. 4.1.2 From the lamps which have passed the inspection test, there shall be selected, at random, an RTQ of 25 lamps. 4.1.3 From the lamps which have passed the rating test, there shall be selected, at random an LTQ of 20 lamps. 4.1.4 Lamps which are accidentall
28、y broken during a test shall, when necessary, be replaced to ensure that the required number of lamps complete the test. The results obtained with replacement lamps shall be substituted for those of the broken lamps. NOTEIn order to avoid unnecessary delay, it is recommended that spare lamps be test
29、ed with each test quantity. 4.2 Inspection 4.2.1 Dimensions. The lamps shall comply with the dimensions shown on the appropriate standard sheet. 4.2.2 Bulb. The bulb shall be clear except where specified on the appropriate standard sheet and free from defects detrimental to service. Where a bulb is
30、coloured, the colouring agent or lacquer shall give an even distribution of light over the entire coloured area and shall not be affected during the life test given in 4.4. With the rated voltage applied to the lamp, the colour shall comply with BS 381C, where specified on the appropriate standard s
31、heet. 4.2.3 Terminations 4.2.3.1 Cap. The caps shall be as specified on the appropriate standard sheet and shall be fixed firmly to the bulbs such that they withstand the initial torque specified in Table 1, without visible relative movement between cap and bulb. The cap shall be held firmly without
32、 distortion and the appropriate torque gradually applied to the bulb in a clockwise direction and held for 5 2 s. Table 1 Initial torque values 4.2.3.2 Connection plates. The connection plates shall be of the size and shape specified on the appropriate standard sheet. The sideplates shall be nickel
33、plated brass, or any other material approved by the customer prior to testing. It shall not be possible to short circuit the two connection plates by means of a 6 mm square section bar not less than 50 mm in length. The connection plates shall be fixed firmly to the bulb such that they will withstan
34、d a pull of 13.5 N. The pull shall be applied perpendicularly to and within 6 mm of the free end of the plate. Attachment to the plate shall be by adhesive; physical deformation by heat shall not occur. 4.2.3.3 Lead-out wires. For wire-ended lamps the wires shall be of the length shown on the approp
35、riate standard sheet. The wires shall meet the bend test requirements of method 2 of test Ub of BS 2011-2.1U:1984, for the size of wire used. 4.2.4 Filament. The filament shall be of the shape and type stated on the appropriate standard sheet. It shall be supported on all the supports provided. Wher
36、e not influenced by contact with the supports or lead-out wires, the filament shall be of uniform colour at rated and half of the rated voltage. The filament shall be nominally central about the longitudinal axis of the bulb and in no case shall the filament touch the side of the bulb. 4.2.5 Solder.
37、 Where the lead-out wires are soldered to the cap, the solder shall be applied evenly and in such quantity as to allow proper engagement of the cap in the appropriate standard lamp holder and to ensure satisfactory electrical contact. The wire shall not project more than 1 mm beyond the surface of t
38、he solder. Cap type (see BS 5101-1) Initial torque Nm E50.06 BA9s E10 0.23 B15d, BA15d1.15 S3sNo requirement Bi-pinNo requirement Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 07:52:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1050:1984 BSI 10-19993 4.3 Rating 4.3.1 Ageing. Before initi
39、al readings are taken, the lamps shall be aged at the life test voltage for 1 0.25 h. 4.3.2 Initial readings. The lamps shall be measured for initial current and lumens at rated voltage, unless otherwise specified on the appropriate standard sheet. 4.3.3 Coloured bulbs. In the case of lamps having c
40、oloured bulbs, the rating tests shall be carried out on similar lamps having clear bulbs selected in accordance with 4.1. 4.4 Life 4.4.1 Operating position. If not specified on the appropriate standard sheet, the lamps under test shall be mounted either in a vertical or a horizontal burning position
41、. They shall be mounted with their centres not less than 25 mm apart, and shall have a free circulation of air in a room temperature not exceeding 30 C. The lamps shall maintain their respective burning positions for the entire test. In addition, for lamps from standard sheets 1, 2 and 3 the average
42、 loading of the test rack shall not exceed 0.16 W/cm2 of face area. 4.4.2 Test voltage. The test voltage shall be the rated voltage unless otherwise specified on the appropriate standard sheet. The supply shall be alternating current at a frequency between 40 Hz and 60 Hz. Short fluctuations from th
43、e test voltage shall not exceed 1.0 %. Where used (see note), an accelerated test voltage shall not exceed 110 % of the rated voltage. The following relationship shall be used to calculate the equivalent life under accelerated test conditions: NOTEFor lamps with rated lives greater than 1 000 h acce
44、lerated life testing may be agreed between customer and supplier. 4.4.3 Test procedure. A record shall be kept of the total burning hours for each lamp. The ageing period referred to in 4.3.1 shall not be included as part of the life. The lamps shall be switched off twice daily during the life test
45、for periods of not less than 15 min, such periods not being included as part of the life. The life test of individual lamps shall be deemed to have terminated if the total burning hours reach 160 % of the rated life, or its equivalent if accelerated testing is used and any lamp still operating shall
46、 be deemed to have a life equal to the total burning hours at termination. 4.4.4 Measurement during test. Where a lumen maintenance requirement is specified on the appropriate standard sheet, the lamps shall be measured for lumens at rated voltage when the total burning hours reach 75 5 % of the rat
47、ed life, or its equivalent if accelerated testing is used. Any lamp with a lumen maintenance less than the minimum average value specified on the appropriate standard sheet (excluding the case of zero lumen maintenance due to early failure) shall be deemed to have a life equal to 69 % of the rated l
48、ife, or its equivalent if accelerated testing is used. 5 Conditions of compliance 5.1 General A batch of lamps shall be deemed to comply with this standard only if the requirements specified in each of 5.2, 5.3 and 5.4 are satisfied. 5.2 Inspection tests 5.2.1 The number of lamps failing to comply w
49、ith any one of 4.2.1 to 4.2.5 inclusive or with clause 3 shall not exceed two. 5.2.2 The cumulative number of lamps failing to comply with all of 4.2.1 to 4.2.5 inclusive and clause 3 shall not exceed four. 5.3 Rating tests 5.3.1 The average initial current of the test quantity shall not fall outside the tolerance shown on the appropriate standard sheet. 5.3.2 The average initial lumens of the test quantity shall not fall outside the tolerance shown on the appropriate standard sheet. 5.3.3 The coefficient of variation of lumens of the test quantity shall n