1、BRITISH STANDARD CONFIRMED APRIL 1992 BS 1050:1984 Specification for Indicator lamps for use in telecommunication apparatus and for allied purposes UDC 621.32:621.39:654.1:654.912.8BS1050:1984 This British Standard, having been prepared under the direction of the Electrical Illumination Standards Co
2、mmittee, was published under the authority of the Board of BSI and comes into effect on 30November1984 BSI 10-1999 First published August1942 First revision October1945 Second revision February1953 Third revision The following BSI references relate to the work on this standard: Committee reference L
3、GL/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 Illumination Standards Committee (LGL/-) to Technical Committee LGL/6 upon which the following bodies were represented: Asso
4、ciation of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA Ltd) Bus and Coach Council Chartered Institution of Building Services Consumer Standards Advisory Committee of BSI Electrical Contractors Association Electricity Supply Industry in England and Wales Engineering Equipmen
5、t and Materials Users Association Institution of Public Lighting Engineers Lighting Industry Federation Ltd. London Transport Executive Ministry of Defence National Illumination Committee of Great Britain Society of Glass Technology Society of Motor Manufacturers and Traders Limited The following bo
6、dies were also represented in the drafting of the standard, through subcommittees and panels: Department of Trade and Industry (Consumer Safety Unit, CCS Division) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd) National Coal Board Amendments issued since publication Amd. No.
7、 Date of issue CommentsBS1050:1984 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii Section 1. General 1 1 Scope 1 2 Definitions 1 3 Marking 2 4 Requirements and tests for inspection, rating and life 2 5 Conditions of compliance 3 Section 2. Standard lamp data sheets
8、 4 Table 1 Initial torque values 2 Publications referred to Inside back coverBS1050:1984 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prepared under the direction of the Electrical Illumination Standards Committee and it supersedes BS1050:1953 which is withdrawn. The oppor
9、tunity 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 2 consisting
10、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. Users of British
11、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, pages1 to 20, an inside back cover and a back cover. T
12、his 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.BS1050:1984 BSI 10-1999 1 Section 1. General 1 Scope This British Standard specifies requirements for low voltage electric lamps operat
13、ing up to and including60V used as visual indicators in telecommunication apparatus and allied purposes. Section 1 specifies general requirements. Section 2 consists of standard lamp data sheets giving particular requirements for individual types of lamp. NOTEThe titles of the publications referred
14、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 same nominal dimensions, rated voltage and photometric and electrical characteristics 2.2 batch all the lamps of one type pu
15、t 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 visual, mechanical and physical requirements of this standard 2.4 rating test quantity (RTQ) the number of lamps to be tested t
16、o 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 requirements for life and for lumen maintenance 2.6 rated voltage the voltage for which the lamp is designed 2.7 initial read
17、ings 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 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 o
18、rder 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 the test conditions of this standard 2.11 rated life the life for which the lamp is designed when operated under the test con
19、ditions 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 is the rated voltage unless otherwise stated on the appropriate standard sheet. 2.14 lumen maintenance (of an individual lamp
20、) 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 arithmetic mean of the values of lumen maintenance for the individual lamps 2.16 standard deviation (of a group of measurements)
21、 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 the number of measurements 2.17 coefficient of variation (of a group of measurements) the standard deviation expressed as a p
22、ercentage 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 filament to a fixed reference point on the cap NOTEThe reference point is indicated on the appropriate standard sheet.BS1050:1
23、984 2 BSI 10-1999 2.19 design test a test made on a sample for the 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 m
24、anufacturers identifying code or mark; c) the lamps rated wattage 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 of35lamps shall be
25、selected, at random, from at least10containers, or from all the containers if there are less than10. 4.1.2 From the lamps which have passed the inspection test, there shall be selected, at random, an RTQ of25lamps. 4.1.3 From the lamps which have passed the rating test, there shall be selected, at r
26、andom an LTQ of20lamps. 4.1.4 Lamps which are accidentally 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 unne
27、cessary delay, it is recommended that spare lamps be tested 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 f
28、ree from defects detrimental to service. Where a bulb is 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 in4.4. With the rated voltage applied to the lamp, the colour shall comply wit
29、h BS381C, where specified on the appropriate standard sheet. 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 inTable 1, without visible relative movement betw
30、een cap and bulb. The cap shall be held firmly without distortion and the appropriate torque gradually applied to the bulb in a clockwise direction and held for5 2s. Table 1 Initial torque values 4.2.3.2 Connection plates. The connection plates shall be of the size and shape specified on the appropr
31、iate standard sheet. The sideplates shall be nickel 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 a6mm square section bar not less than50mm in length. The connection plates shall be fixed
32、 firmly to the bulb such that they will withstand a pull of13.5N. The pull shall be applied perpendicularly to and within6mm 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 wire
33、s shall be of the length shown on the appropriate standard sheet. The wires shall meet the bend test requirements of method2of test Ub of BS2011-2.1U: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 sup
34、ported on all the supports provided. Where 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
35、touch the side of the bulb. 4.2.5 Solder. 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 proje
36、ct more than1mm beyond the surface of the solder. Cap type (see BS 5101-1) Initial torque Nm E5 0.06 BA9s E10 0.23 B15d, BA15d 1.15 S3s No requirement Bi-pin No requirement BS1050:1984 BSI 10-1999 3 4.3 Rating 4.3.1 Ageing. Before initial readings are taken, the lamps shall be aged at the life test
37、voltage for1 0.25h. 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 coloured bulbs, the rating tests shall be carried out on similar la
38、mps having clear bulbs selected in accordance with4.1. 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. They shall be mounted with their centres not less than25mm apart,
39、 and shall have a free circulation of air in a room temperature not exceeding30 C. The lamps shall maintain their respective burning positions for the entire test. In addition, for lamps from standard sheets1,2and3the average loading of the test rack shall not exceed0.16 W/cm 2of face area. 4.4.2 Te
40、st 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 40Hz and60Hz. Short fluctuations from the test voltage shall not exceed 1.0%. Where used (see note), an accelerated tes
41、t voltage shall not exceed110% 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 than1000h accelerated life testing may be agreed between customer and supplier. 4.4.3 Test procedur
42、e. A record shall be kept of the total burning hours for each lamp. The ageing period referred to in4.3.1 shall not be included as part of the life. The lamps shall be switched off twice daily during the life test for periods of not less than15min, such periods not being included as part of the life
43、. The life test of individual lamps shall be deemed to have terminated if the total burning hours reach160% of the rated life, or its equivalent if accelerated testing is used and any lamp still operating shall be deemed to have a life equal to the total burning hours at termination. 4.4.4 Measureme
44、nt 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 reach755% of the rated life, or its equivalent if accelerated testing is used. Any lamp with a lumen maintenance
45、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 to69% of the rated life, or its equivalent if accelerated testing is used. 5 Conditions of compliance 5.1 General A
46、 batch of lamps shall be deemed to comply with this standard only if the requirements specified in each of5.2, 5.3 and5.4 are satisfied. 5.2 Inspection tests 5.2.1 The number of lamps failing to comply with any one of4.2.1 to4.2.5 inclusive or with clause3 shall not exceed two. 5.2.2 The cumulative
47、number of lamps failing to comply with all of4.2.1 to4.2.5 inclusive and clause3 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 q
48、uantity 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 not exceed the maximum shown on the appropriate standard sheet (where required). 5.4 Life tests 5.4.1 The average life of the test quantity sh
49、all not be less than90% of the rated life shown on the appropriate standard sheet, or its equivalent if accelerated testing is used. 5.4.2 The average lumen maintenance of the test quantity, excluding any lamp which has zero lumen maintenance due to early failure, shall not be less than the minimum shown on the appropriate standard sheet. 5.4.3 The number of lamps having lives less than70% of the rated life shown on the appropriate standard sheet, or its equivalent if accelerated testing is used, including any lamp not complying with the lumen maintenance requ
