1、BRITISH STANDARD BS 2909:1957 Specification for Cabinets for the electrical euthanasia ofdogsBS2909:1957 This British Standard, having been approved by the Electrical Industry Standards Committee and endorsed by the Chairman ofthe Engineering Divisional Council, was published undertheauthority of th
2、e GeneralCouncil 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 02707 4 Co-operating organizations The Electrical Industry Standards Committee, under whose supervision this British S
3、tandard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Admiralty Air Ministry Associated Offices Technical Committee Association of Consulting Engineers (Incorporated) Association of Supervising Electrical Engineers Br
4、itish Electrical and Allied Industries Research Association British Electrical and Allied Manufacturers Association British Electrical Development Association British Railways, The British Transport Commission Cable Makers Association Central Electricity Authority and Area Boards Crown Agents for Ov
5、ersea Governments and Administrations Electric Lamp Manufacturers Association Electric Light Fittings Association Electrical Contractors Association (Incorporated) Electrical Contractors Association of Scotland Engineering Equipment Users Association General Post Office Independent Cable Makers Asso
6、ciation Institution of Electrical Engineers Ministry of Power Ministry of Labour and National Service (Factory Inspectorate) Ministry of Supply Ministry of Works National Physical Laboratory (D.S.I.R.) Oil Companies Materials Committee Public Transport Association (Incorporated) Radio Industry Counc
7、il 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 entrusted with the preparation of the standard: British Veterinary Association Our Dumb Friends League Royal Society f
8、or the Prevention of Cruelty to Animals Universities Federation for Animal Welfare Individual Manufacturers Amendments issued since publication Amd. No. Date CommentsBS2909:1957 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 Section 1. Design and cons
9、truction 2 Cabinet 1 3 Electrodes 1 4 Continuity test circuit 2 5 Output 2 6 Interlocks 2 7 Connection to electricity supply 2 8 Creepage distances and clearances 3 9 Accessibility of live parts 3 10 Earthing 3 11 Stability 3 12 Protection against moisture 3 13 Temperature rise 3 Section 2. Marking
10、14 Marking 3 Section 3. Tests 15 General 4 16 Accessibility of live parts 4 17 Stability 4 18 Mechanical strength 4 19 Flexible cord anchorage 5 20 Electrode lead anchorage 5 21 Splash test 5 22 Insulation resistance in humid conditions 5 23 Insulation strength 5 24 Transformer insulation 5 25 Conti
11、nuity indicator 6 26 Head current 6 27 Body current 6 28 Earth continuity 6 29 Absorbency of contact pads 7 Appendix An electroplectic fit 8 Figure 1 Standard test finger 9 Figure 2 Splash apparatus 10BS2909:1957 ii BSI 12-1999 Foreword This standard makes reference to the following British Standard
12、s: BS 7, Rubber-insulated cables and 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 St
13、andard has been prepared under the 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
14、 use of high voltages and renders 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 si
15、de to side. Such a current does not, 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
16、 been standardized as it gives the 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. NOTEW
17、here metric equivalents have been 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 necessa
18、ry provisions of a contract. Users 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, pagesi andii, pages1 to1
19、0 and 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.BS2909:1957 BSI 12-1999 1 1 Scope This standard gives requirements for the construction, safety and performance of
20、 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 of which does not exceed 250 volts. Section 1. Design and construction 2 Cabine
21、t 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 adequate strength and shall pass the mechanical strength tests of Clause 18. Th
22、e 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 cabinet shall be provided with sufficient observation windows to give adequate ill
23、umination 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 adequately protected. The cabinet shall be provided with electrical equipment capable
24、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 animals ears. The third electrode shall be a clip or a chain suitable for attachment
25、 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 corners on those parts of the electrodes which can come in contact with the ani
26、mal. 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 arranged that the contact with the animal is made through the pads. The contact
27、 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 mountings of the ear electrodes shall be such that the pads are free in their
28、 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 connected to the output terminals by means of a flexible cord. The connection
29、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 clip off the animals ear. iii) Weight and contact pressure A. Ear clips. The
30、weight of the ear clip, together with a 1 ft (30.5 cm) length of the connecting cord, and the clip connector, ifany, shall not exceed 4 oz (113 g). The pressure exerted by the ear pads, whenseparated by a distance of 1 / 10in. (2.5 mm) shall be not less than 1 1 / 2lb/sq. in. (0.11 kg/sq. cm). The t
31、otal force exerted with a separation of 3 / 8in. (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 / 4in. (19.0 mm). The distances of separation shall be measured in the line passing through the points of attachment of the pad
32、 mountings to the clips. B. Leg clips. The force necessary to separatethe pads shall be not less than 1 1 / 2lb (0.68 kg) with a separation of 1 / 10in. (2.5 mm) and not greater than 10 lb (4.5 kg) with a separation of 1 in. (25.4 mm). When fully open the separation shall be not less than 1 1 / 2in.
33、 (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 farenough to admit a cylinder of 1 1 / 2in. (38.1 mm) diameter. BS2909:1957 2 BSI
34、 12-1999 c) Chain electrodes. Chains shall be of flat,multiple-link pattern, not less than 1 / 2in. (12.7 mm) wide and with a pitch ofnotgreater than 3 / 8in. (9.5 mm). 4 Continuity test circuit The apparatus shall be provided with means for checking that continuity exists between the ear electrodes
35、 when these are clipped in the correct position on the animal. The current passing through the electrodes during the continuity 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 trans
36、former shall not exceed 24 volts r.m.s. The current shall not exceed 0.24 mA. The indicator of the continuity tester shall 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
37、shall ensure that a current greater than0.5 ampere and not greater than 5.0 amperes will pass through any resistance within 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 el
38、ectrodes, and the leg electrode. b) Control. The output currents shall be initiated manually and switched off automatically, 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) Indica
39、tor. An indicator shall be provided to show in amperes the amount of current passing. d) Fuses and cut-outs. There shall 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 int
40、erlocks so that both poles of the output transformer and any other live parts that can be touched, other than those associated 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
41、shall be provided, two for the reception of the supply conductors and one for the earthing conductor. The terminals shall be situated near to the point of entry of the supply conductors and they shall comply with the requirements of BS 816 1) . Self-tapping screws shall not be used for electrical co
42、nnections. b) Conductors i) Flexible cord. The flexible cord shall comply with either BS 7:1953 2)or BS 2004:1955 3)and, in 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 f
43、or the supply conductors shall be smooth, well rounded and made watertight with a gland suitable for flexible cord, or with 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 tr
44、ansmitted to the terminal connections. Aknot in the cord is unacceptable. Theanchorage shall pass the test of Clauses31 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 Insti
45、tution of Electrical Engineers and for the time being in force. For the current betweenthe ear electrodes not less than 0.5 sec and not longer than 1.5 sec for the current throughthe leg electrode not less than 2 sec and not longer than 4 sec. 1) BS 816, “Requirements for electrical appliances and a
46、ccessories”. 2) BS 7, “Rubber-insulated cables and flexible cords for electric power and lighting”. 3) BS 2004, “Polyvinyl chloride insulated cables and flexible cords for electric power and lighting”.BS2909:1957 BSI 12-1999 3 8 Creepage distances and clearances The creepage distances and clearances
47、 shall be 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 t
48、est 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 effectively bonded to t
49、he earth terminal as shown by the test of Clause28. 11 Stability The cabinet shall have adequate stability as shown by the test of Clause 17 with doors both open and closed. 12 Protection against moisture The electrical equipment shall be so positioned and protected that water, urine, etc., cannot come into contact with it under the conditions in which the cabinet is normally installed or used. In particular the apparatus shall pass the tests of Clauses 21 and22. 13 Temperature rise The temperature rise of any component parts, due to a current the duration of whi
