BS EN 60512-20-2-2001 Electromechanical components for electronic equipment - Basic testing procedures and measuring methods - Test 20b - Flammability tests - Fireproofness - Secti.pdf

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1、BRITISH STANDARD BS EN 60512-20-2:2001 IEC 60512-20-2: 2000 Electromechanical components for electronic equipment Basic testing procedures and measuring methods Part 20-2: Test 20b Flammability tests Fireproofness The European Standard EN 60512-20-2:2000 has the status of a British Standard ICS 31.2

2、20.01 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 60512-20-2:2001 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August

3、2001 BSI 07-2001 ISBN 0 580 38152 8 National foreword This British Standard is the official English language version of EN 60512-20-2:2000. It is identical with IEC 60512-20-2:2000. The UK participation in its preparation was entrusted by Technical Committee EPL/48, Electromechanical components for

4、electronic equipment, to Subcommittee EPL/48/2, Connectors for electronic equipment, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old

5、 number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement these international or European publi

6、cations may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users o

7、f British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or p

8、roposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 11 and a back cover. The BSI copyright date dis

9、played in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments-21506-020002:CEI 2 3 CONTENTS Page Clause 1 Scope and object . 4 2 Test equipment 4 3 Test specimen . 5 4 Test procedure.5 5 Warning. 6 6 Details to be specified 6 Figure 1

10、 Details of thermocouple . 7 Figure 2 Details of firewall connector fixture. 8 Figure 3 Firewall connector fixture assembly 9 Figure 4 Firewall connector test set-up . 10 Figure 5 Schematic circuit for testing firewall connectors 11 Table 1 Firewall connector test currents. 7 Page3 EN60512202:2000 B

11、SI072001-21506-020002:CEI 2 4 ELECTROMECHANICAL COMPONENTS FOR ELECTRONIC EQUIPMENT BASIC TESTING PROCEDURES AND MEASURING METHODS Part 20-2: Test 20b Flammability tests Fireproofness 1 Scope and object This part of IEC 60512, when required by the detail specification, is used for testing electromec

12、hanical components within the scope of IEC technical committee 48. This test may also be used for similar components when specified in a detail specification. The object of this test is to detail a standard method to assess the ability of a connector to withstand specified flame and vibration during

13、 a 20 min exposure by providing specified electrical performance for the first 6 min of exposure and preventing the flame from penetrating the fireproof bulkhead on which the connector is mounted throughout the test. 2 Test equipment 2.1 An inspirator torch capable of producing and maintaining a fla

14、me at a constant temperature of 1 100 C 25 C from propane gas with a flow rate equivalent to an input of 9,67 kW to 10,84 kW (33 000 Btu/h to 37 000 Btu/h) is required. The primary cone diameter shall be 12,7 mm to 19 mm at the nozzle exit. The primary cone length shall be 38,1 mm to 63,5 mm from th

15、e nozzle. The secondary cone shall engulf the test specimen or provide representative impingement coverage, depending on the size of the test specimen. 2.2 A gas flowmeter with a suitable range and an accuracy of 2 % of full scale is required. 2.3 A thermocouple with an exposed junction as shown in

16、figure 1 and a temperature meter capable of continuously measuring 1 100 C 25 C, with an accuracy of 1 % of the reading, are required. 2.4 A firewall test fixture is required which provides a steel mounting plate on which to mount the fixed connector, a rigid steel fixture which provides for attachm

17、ent of the connector mounting plate in a vertical plane on the table of a vibration machine and a thermal barrier sheet to prevent destructive heat transfer from the connector mounting plate to the vibration machine. Details of a suitable fixture are shown in figures 2, 3 and 4. 2.5 Vibration equipm

18、ent is required which is capable of vibrating the test specimen and test fixture continuously at 33 Hz with a total excursion of 6,3 mm. 2.6 A current-regulated d.c. power supply is required which will provide test currents of between 5 A minimum and 150 A maximum, with a maximum open-circuit voltag

19、e of 28 V d.c. 2.7 An a.c. power supply is required which has a center-tapped output transformer capable of producing 110/220 V to 130/260 V at 50 Hz to 60 Hz and capable of delivering a current of 2 A minimum. 4egaP 0002:20221506NE BSI072001 Page4 EN60512202:2000 BSI072001-21506-020002:CEI 2 5 2.8

20、A multi-range undamped a.c. ammeter is required with an accuracy of 1 % of full scale, capable of measuring d.c. currents between 5 A and 150 A. 2.9 Two a.c. ammeters are required, both with 3 A full scale and an accuracy of 1 % at 2 A scale reading. 3 Test specimen 3.1 The test specimen shall consi

21、st of a mated connector, fully wired with specified high- temperature wire and fitted with accessories having straight saddle-bar cable clamps. 3.2 Alternate contacts of the test specimen shall be connected to form two series circuits. 3.3 The test specimen shall be free of oil, grease, dirt and oth

22、er foreign matter. Cleaning, if required, shall be performed with a non-combustible solvent. 3.4 The wire bundle shall be wrapped with plain untreated fiberglass tape (see figure 4) or other suitable means to protect the wire from the flame and to stabilize the interface between the wire bundle and

23、the connector during the application of flame and vibration. This protective wrap shall extend under the cable clamp and should be as close as possible to the rear of the connector insulation. The protective wrap shall extend a minimum of 178 mm from the rear of the saddle clamp on the free connecto

24、r. 4 Test procedure 4.1 The test specimen shall be secured to the connector mounting plate (see figures 2, 3 and 4). 4.2 The connector mounting plate and the thermal barrier sheet shall be secured to the firewall test fixture (see figure 3). 4.3 The firewall test fixture shall be secured to the vibr

25、ation machine table (see figure 4). 4.4 The wire bundles on both ends of the test specimen shall be supported 200 mm to 250 mm from the cable clamp. 4.5 The wired connectors shall be connected in the test circuit as shown in figure 5 to monitor the electrical integrity of the test specimen in accord

26、ance with 4.10. The connector shall be solidly earthed during the entire test. 4.6 The thermocouple shall be positioned as shown in figure 4. 4.7 All contacts of the test specimen shall be loaded with the applicable d.c. test current specified in table 1. The test current shall not be altered during

27、 the test. 4.8 The torch and the thermocouple shall be mounted on a common pivot point. They shall be moved away from the test specimen so the flame does not contact the connector when the gas is ignited. The gas shall be ignited and the flow of gas shall be adjusted from 9,67 kW to 10,84 kW (33 000

28、 Btu/h to 37 000 Btu/h). 5egaP 0002:20221506NE BSI072001 Page5 EN60512202:2000 BSI072001-21506-020002:CEI 2 6 4.9 The vibration machine shall be started and vibrated continuously at 33 Hz with a total excursion of 6,3 mm. 4.10 Flame and vibration test (20 min total duration) a) The torch and the the

29、rmocouple shall be moved to the position shown in figure 4. When the temperature of the thermocouple reaches 1 100 C 25 C, the 20 min test period shall start. The gas flow and temperature shall be monitored throughout the test. b) The presence of flame on the protected side of the firewall, for any

30、reason or from any source, during the entire 20 min of flame exposure, shall be observed and recorded. 4.10.1 Electrical performance test, 6 min (see figure 5) a) During the first 5 min of combined flame and vibration with switch 1 closed, the specified d.c. current shall be applied through all cont

31、acts of the test specimen. The ammeter shall be monitored for fluctuations indicating current discontinuities which should not drop below 10 % of the initial value. b) At the end of 5 min, the d.c. power and its load shall be disconnected by opening switch 1. c) The voltage of 110 V a.c. to 130 V a.

32、c. shall be applied for 1 min between each group of contacts and the shell by closing switch 2. The ammeters shall be observed for leakage currents, which shall not exceed 2 A. 4.10.2 Flame and vibration, continued, 14 min At the end of 6 min, the a.c. potential shall be removed and the flame and vi

33、bration shall be continued for another 14 min for a total elapsed time of 20 min. 5 Warning 5.1 This procedure may involve hazardous materials, operations and equipment. This procedure does not pretend to address all safety problems associated with its use or all regulatory requirements. It is the r

34、esponsibility of the user of this procedure to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. 5.2 This test shall be conducted in a well-ventilated area to avoid inhalation of smoke and toxic products of combustion. Pers

35、onnel and equipment shall be protected from the risk of fire. 6 Details to be specified When this test is required by the detail specification, the following details shall be specified: a) preparation of the specimen; b) cable/wire to be used; c) any deviation from the standard test method. 6egaP 00

36、02:20221506NE BSI072001 Page6 EN60512202:2000 BSI072001-21506-020002:CEI 2 7 Table 1 Firewall connector test currents Contact size DC test currents A 22 5,0 20 7,5 16 13 12 23 84 6 48 0 0 150 The thermocouple wire shall be platinum-rhodium, type R, 0,6 mm in diameter. If a metal sheath is used, the

37、maximum diameter shall not exceed 3 mm. The thermocouple shall be unshielded. Figure 1 Details of thermocouple 19 mm min. Insulation Sheath Weld (bead) IEC 397/2000 7egaP 0002:20221506NE BSI072001 Page7 EN60512202:2000 BSI072001-21506-020002:CEI 2 8 Mild steel 1,57 thick Mild steel 1,57 thick 5,28 5

38、,13 (12 required, see hole pattern) 5,28 5,13 (17 required, see hole pattern) 8,53 8,36 (2 required) Thermal barrier sheet c Connector mounting plate A a B (4 required) b Mild steel 12,7 thick 5,28 5,13 (17 required, see hole pattern) Support plate 5,28 5,13 (typ.) (ref.) Hole pattern 178 (ref.) 254

39、 (ref.) Dimensions in millimetres NOTE Dimensions are symmetrical about the vertical centerline. a Hole “A“ shall provide suitable clearance for the test specimen. b Connector mounting holes “B” shall be as specified for the fixed connector. c Thermal barrier sheet is required to prevent destructive

40、 heat transfer to the vibration equipment. Figure 2 Details of firewall connector fixture IEC 398/2000 8egaP 0002:20221506NE BSI072001 Page8 EN60512202:2000 BSI072001-21506-020002:CEI 2 9 25,4 (ref.) Weld (typ.) (2 places) Detail A Inches mm 0,125 3,18 0,190 4,83 0,250 6,35 0,500 12,70 1,000 25,40 1

41、,250 31,75 7,000 177,80 8,200 208,28 10,000 254,00 11,000 279,40 4,8-32 NC 31,75 HD socket HD cap screw (17 sets required) Detail B Thermal barrier sheet (6,35 sheet ceramic or equivalent) Connector mounting plate (3,18 thick) Support plate Connector mounting holes See detail B See detail A 254 254

42、12,7 Mild steel Dimensions in millimetres Figure 3 Firewall connector fixture assembly IEC 399/2000 9egaP 0002:20221506NE BSI072001 Page9 EN60512202:2000 BSI072001-21506-020002:CEI 2 01 Torch and thermocouple to be mounted on common pivot point Torch Plug Receptacle Thermocouple bead (junction) Fibe

43、rglass warp Wire bundle Cable clamp Fiberglass warp (see 2.4) Connector mounting plate Thermal barrier sheet Torch (For detail of firewall fixture see figures 2 and 3) Connector mounting hardware Vibration direction Vibration table Assembly bolt Wire bundle moved to show torch position 6,53 0,5 6,53

44、 0,5 Dimensions in millimetres Figure 4 Firewall connector test set-up IEC 400/2000 01egaP 0002:20221506NE BSI072001 Page10 EN60512202:2000 BSI072001-21506-020002:CEI 2 11 NOTE Fuses are optional to protect ammeters. Switch 2 Switch 1 Load 28 V d.c. 110-130 V a.c. 110-130 V a.c. 220-250 V a.c. Serie

45、s even contacts Series odd contacts Mated connector shells Figure 5 Schematic circuit for testing firewall connectors _ IEC 401/2000 11egaP 0002:20221506NE BSI072001 Page11 EN60512202:2000 BSI072001BS EN 60512-20-2:2001 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI i

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