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1、BRITISH STANDARD BS 2909:1957 Specification for Cabinets for the electrical euthanasia of dogs Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 12:37:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2909:1957 This British Standard, having been approved by the Electrical Industry Standards Comm
2、ittee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 23 October 1957 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ELE/72 Draft for comment CW(ELE)9678 ISBN 0 580 0270
3、7 4 Co-operating organizations The Electrical Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Admiralty Air Ministry Associated Offices Technic
4、al Committee Association of Consulting Engineers (Incorporated) Association of Supervising Electrical Engineers British Electrical and Allied Industries Research Association British Electrical and Allied Manufacturers Association British Electrical Development Association British Railways, The Briti
5、sh Transport Commission Cable Makers Association Central Electricity Authority and Area Boards Crown Agents for Oversea Governments and Administrations Electric Lamp Manufacturers Association Electric Light Fittings Association Electrical Contractors Association (Incorporated) Electrical Contractors
6、 Association of Scotland Engineering Equipment Users Association General Post Office Independent Cable Makers Association Institution of Electrical Engineers Ministry of Power Ministry of Labour and National Service (Factory Inspectorate) Ministry of Supply Ministry of Works National Physical Labora
7、tory (D.S.I.R.) Oil Companies Materials Committee Public Transport Association (Incorporated) Radio Industry Council South of Scotland Electricity Board War Office The organization marked with an asterisk in the above list, together with the following, were directly represented on the Committee entr
8、usted with the preparation of the standard: British Veterinary Association Our Dumb Friends League Royal Society for the Prevention of Cruelty to Animals Universities Federation for Animal Welfare Individual Manufacturers Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffi
9、eldun sheffieldun, na, Mon Nov 27 12:37:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2909:1957 BSI 12-1999i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 Section 1. Design and construction 2Cabinet1 3Electrodes1 4Continuity test circuit2 5Output2 6Interlocks2 7Con
10、nection to electricity supply2 8Creepage distances and clearances3 9Accessibility of live parts3 10Earthing3 11Stability3 12Protection against moisture3 13Temperature rise3 Section 2. Marking 14Marking3 Section 3. Tests 15General4 16Accessibility of live parts4 17Stability4 18Mechanical strength4 19
11、Flexible cord anchorage5 20Electrode lead anchorage5 21Splash test5 22Insulation resistance in humid conditions5 23Insulation strength5 24Transformer insulation5 25Continuity indicator6 26Head current6 27Body current6 28Earth continuity6 29Absorbency of contact pads7 Appendix An electroplectic fit8
12、Figure 1 Standard test finger9 Figure 2 Splash apparatus10 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 12:37:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2909:1957 ii BSI 12-1999 Foreword This standard makes reference to the following British Standards: BS 7, Rubber-insulated cables a
13、nd flexible cords for electric power and lighting. BS 350, Conversion factors and tables. BS 816, Requirements for electrical appliances and accessories. BS 2004, Polyvinyl chloride insulated cables and flexible cords for electric power and lighting. This British Standard has been prepared under the
14、 authority of the Electrical Industry Standards Committee as a result of a request from the British Veterinary Association. In the destruction of dogs by electrical means certain precautions must be taken to ensure that the procedure is humane. This necessitates the use of high voltages and renders
15、the use of a cabinet method essential in order to safeguard the operator. To ensure that no undue suffering occurs it is necessary to produce unconsciousness in the shortest possible time. This can be achieved by passing a sufficient current through the head from side to side. Such a current does no
16、t, however, necessarily kill the dog and it is therefore necessary to pass an additional current through the body to stop the heart. These currents may be simultaneous, or the head current may pass before the body current. In this specification the latter method has been standardized as it gives the
17、 operator opportunity to observe that the dog has been stunned before the killing voltage is applied. The question of an automatic method for the delivery of the two shocks in sequence is under consideration and may form the subject of a further specification. NOTEWhere metric equivalents have been
18、given, the figures in British units are to be regarded as standard. The metric conversions are approximate. More accurate conversions should be based on tables in BS 350, “Conversion factors and tables”. A British Standard does not purport to include all the necessary provisions of a contract. Users
19、 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 10 and a back cover. This stand
20、ard 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, Mon Nov 27 12:37:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2909:1957 BSI 12-19991 1 Scope Th
21、is standard gives requirements for the construction, safety and performance of electrical euthanasia cabinets for dogs. Details of tests necessary to ensure compliance with the standard are also given. The specification covers apparatus designed for operation from an electricity supply the voltage o
22、f which does not exceed 250 volts. Section 1. Design and construction 2 Cabinet The cabinet shall be so designed and constructed that it is capable of effectively rendering dogs unconscious and then killing them without danger to the operator or surroundings. It shall be soundly constructed and of a
23、dequate strength and shall pass the mechanical strength tests of Clause 18. The cabinet, or that part in which the animal stands, shall be constructed of, or lined with, non-absorbent insulating material and shall be so designed that there are no awkward corners that are difficult to clean. The cabi
24、net shall be provided with sufficient observation windows to give adequate illumination and allow clear visibility of the whole of that part in which the animal stands. The means provided for securing the animal shall be firmly attached to the cabinet. Materials liable to corrosion shall be adequate
25、ly protected. The cabinet shall be provided with electrical equipment capable of complying with the performance requirements of this standard. 3 Electrodes a) General. The cabinet shall be provided with three electrodes. Two of these shall be in the form of clips suitable for attaching to the animal
26、s ears. The third electrode shall be a clip or a chain suitable for attachment to one of the hind legs. The electrodes shall be made of materials which will not develop a non-conducting corrosion film through the action of salt solution, soaps, detergents or urine. There shall be no sharp edges or c
27、orners on those parts of the electrodes which can come in contact with the animal. b) Clip electrodes. Clip electrodes shall be so designed that the contact members can be separated with one hand. i) Contact pads. Each clip electrode shall be provided with two contact pads of absorbent material so a
28、rranged that the contact with the animal is made through the pads. The contact area of each pad shall be not less than half a square inch (3.22 sq. cm) and the pads shall be readily replaceable. The pads shall be of such material and size that they will pass the absorbency test of Clause 29. The pad
29、 mountings of the ear electrodes shall be such that the pads are free in their supports to rotate in the plane of the contact area and can tilt in any direction up to an angle of 20 with the line passing through the two points of attachment to the clips. ii) Connection. Each clip electrode shall be
30、connected to the output terminals by means of a flexible cord. The connection shall be made through a plug and socket or similar device at either or both ends of the connecting cord. If any means are adopted for taking up the slack in the electrode leads the tension shall not be sufficient to pull a
31、 clip off the animals ear. iii) Weight and contact pressure A. Ear clips. The weight of the ear clip, together with a 1 ft (30.5 cm) length of the connecting cord, and the clip connector, if any, shall not exceed 4 oz (113 g). The pressure exerted by the ear pads, when separated by a distance of 1/1
32、0 in. (2.5 mm) shall be not less than 11/2 lb/sq. in. (0.11 kg/sq. cm). The total force exerted with a separation of 3/8 in. (9.5 mm) shall not be greater than 10 lb (4.5 kg). When fully open, the separation of contact pads shall be not less than 3/4 in. (19.0 mm). The distances of separation shall
33、be measured in the line passing through the points of attachment of the pad mountings to the clips. B. Leg clips. The force necessary to separate the pads shall be not less than 11/2 lb (0.68 kg) with a separation of 1/10 in. (2.5 mm) and not greater than 10 lb (4.5 kg) with a separation of 1 in. (2
34、5.4 mm). When fully open the separation shall be not less than 11/2 in. (38.1 mm). For the purposes of these measurements, the separation shall be the average of the separation of the pad mounting at the points nearest to and furthest from the fulcrum. The jaws shall be capable of opening far enough
35、 to admit a cylinder of 11/2 in. (38.1 mm) diameter. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 12:37:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2909:1957 2 BSI 12-1999 c) Chain electrodes. Chains shall be of flat, multiple-link pattern, not less than 1/2 in. (12.7 mm) wide and wit
36、h a pitch of not greater than 3/8 in. (9.5 mm). 4 Continuity test circuit The apparatus shall be provided with means for checking that continuity exists between the ear electrodes when these are clipped in the correct position on the animal. The current passing through the electrodes during the cont
37、inuity test shall be a.c. derived from an isolating transformer having either separate bobbins or an earthed screen between windings. The open circuit output voltage of this transformer shall not exceed 24 volts r.m.s. The current shall not exceed 0.24 mA. The indicator of the continuity tester shal
38、l show that unsatisfactory conditions exist if the resistance between the ear electrodes is greater than 20 000 ohms. 5 Output a) Current. The source of the electrocuting current shall ensure that a current greater than 0.5 ampere and not greater than 5.0 amperes will pass through any resistance wit
39、hin the range 100 to 1 000 ohms between the electrodes. Provision shall be made for applying such current first between the two ear electrodes and then between one, or both, ear electrodes, and the leg electrode. b) Control. The output currents shall be initiated manually and switched off automatica
40、lly, the duration of the currents being: It shall not be possible to apply the current through the leg electrode before the current between the ear electrodes has ceased. c) Indicator. An indicator shall be provided to show in amperes the amount of current passing. d) Fuses and cut-outs. There shall
41、 be no fuses or cut-outs in the output circuit. 6 Interlocks All doors and openings in the cabinet which can be opened without the use of a tool shall be provided with suitable interlocks so that both poles of the output transformer and any other live parts that can be touched, other than those asso
42、ciated with the continuity test circuit, are connected to earth unless the doors and openings are properly closed. 7 Connection to electricity supply a) Terminals. Three terminals shall be provided, two for the reception of the supply conductors and one for the earthing conductor. The terminals shal
43、l be situated near to the point of entry of the supply conductors and they shall comply with the requirements of BS 8161). Self-tapping screws shall not be used for electrical connections. b) Conductors i) Flexible cord. The flexible cord shall comply with either BS 7:19532) or BS 2004:19553) and, i
44、n the former case, shall be a tough rubber-sheathed cord as specified in Clause 50 and in the latter case a p.v.c.-sheathed cord as specified in Clause 24. ii) Entry. The entry for the supply conductors shall be smooth, well rounded and made watertight with a gland suitable for flexible cord, or wit
45、h a watertight plug and socket. iii) Anchoring. Provision shall be made for anchoring the flexible cord and electrode leads in such a way that any force applied to them is not transmitted to the terminal connections. A knot in the cord is unacceptable. The anchorage shall pass the test of Clauses 31
46、 and 32. iv) Rating. The rating of the conductors shall be appropriate to the appliance, in accordance with the ratings for the Electrical Equipment of Buildings issued by the Institution of Electrical Engineers and for the time being in force. For the current between the ear electrodes not less tha
47、n 0.5 sec and not longer than 1.5 sec for the current through the leg electrode not less than 2 sec and not longer than 4 sec. 1) BS 816, “Requirements for electrical appliances and accessories”. 2) BS 7, “Rubber-insulated cables and flexible cords for electric power and lighting”. 3) BS 2004, “Poly
48、vinyl chloride insulated cables and flexible cords for electric power and lighting”. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 12:37:09 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2909:1957 BSI 12-19993 8 Creepage distances and clearances The creepage distances and clearances shall be
49、 not less than the following: In assessing creepage distances and clearances enamelled and unimpregnated textile-covered wires are regarded as bare wires. 9 Accessibility of live parts Except for the continuity test circuit, it shall not be possible to touch any live parts as shown by the test of Clause 16. The requirement of this clause shall apply when any doors or openings which can be opened without the use of a tool are in the open and in the closed positions. 10 Earthing Except for the continuity test circuit, all metal parts which can be touched shall be e