1、BRITISH STANDARD BS 5972:1980 Incorporating Amendment Nos. 1 and 2 Specification for Photoelectric control units for road lighting UDC 628.971.6:628.9.041.6 523:621.316.5:621.383.4BS5972:1980 This British Standard, having been prepared under the directionof the Electrical Illumination Standards Comm
2、ittee, was published underthe authority of the Executive Board and comes intoeffect on 30 September 1980 BSI 06-1999 The following BSI references relate to the work on this standard: CommitteereferenceLGL/3 Draftfor comment 77/24298 DC ISBN 0 580 11595 X Cooperating organizations The Electrical Illu
3、mination Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Association of Manufacturers Allied to the Electrical and Electronic Industry(BEAMA)* Association of Public Lighting Engineers* British Glass Industry Research Asso
4、ciation British Railways Board* Cbmpe Chartered Institution of Building Services* Civil Aviation Authority Consumer Standards Advisory Committee of BSI* Department of Industry (National Physical Laboratory) Department of the Environment (Building Research Establishment) Department of Transport* Elec
5、tricity Supply Industry in England and Wales* Engineering Equipment Users Association Institute of Purchasing and Supply Institution of Electrical and Electronics Technicians Engineers Ltd. Institution of Electrical Engineers Lighting Industry Federation Ltd.* London Transport Executive National Ill
6、umination Committee of Great Britain Royal Institute of British Architects Society of British Gas Industries The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British S
7、tandard: Association of Control Manufacturers Tacma (BEAMA) Association of County Councils British Plastics Federation Decorative Lighting Association Department of Trade Electrical Contractors Association Glass Manufacturers Federation Health and Safety Executive Society of Glass Technology Amendme
8、nts issued since publication Amd. No. Date of issue Comments 4094 December 1982 4486 February 1984 Indicated by a sideline in the marginBS5972:1980 BSI 06-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii Section 1. General 1 Scope 1 2 References 1 3 Definitions 1 4 Gener
9、al test requirements 1 5 Classification 1 6 Marking 2 Section 2. Photoelectric control units 7 Construction 2 8 Insulation resistance and electric strength 3 9 Creepage distances and clearances 4 10 Electrical performance 4 11 Photometric performance 4 Section 3. Sockets 12 Mechanical construction 5
10、 13 Resistance to heat, fire and tracking 5 14 Ingress of moisture 5 15 Electrical contacts and connections 5 16 Creepage distances and clearances 6 17 Terminations 6 18 Protection against electric shock 6 19 Insulation resistance and electric strength 6 20 Provision for earthing 6 Appendix A Test f
11、or switching 12 Appendix B Test of illuminance levels of switching of PECU 12 Appendix C Desirable features of design of PECU and sockets 12 Figure 1 Blade dimensions of one-part controls 7 Figure 2 Switching test circuit 8 Figure 3 Typical arrangement of a socket 9 Figure 4 Details of photocell soc
12、ket design 10 Figure 5 Typical apparatus for test of illuminance levels for switching 11 Table 1 Insulation resistance and electric strength of PECU 4 Table 2 Minimum creepage distances and clearances of PECU 5 Publications referred to 14BS5972:1980 ii BSI 06-1999 Foreword This standard has been pre
13、pared under the direction of the Electrical Illumation Standards Committee. Certification. Attention is drawn to the certification facilities described on the inside back cover of this standard. A British Standard does not purport to include all the necessary provisions of a contract. Users of Briti
14、sh 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, pages1to 14, an inside back cover and a back cover.
15、 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.BS5972:1980 BSI 06-1999 1 Section 1. General 1 Scope This standard specifies requirements for the safety and performance of: a) photo
16、electric control units (PECU); b) photocell sockets. Both items are for use in switching road lighting lanterns, road traffic signs and other apparatus in response to variations in daylight. The PECU and sockets are for operation on supply voltages not exceeding 250 V to earth or between terminals,
17、and for switching a current not exceeding 10 A. 2 References The titles of the publications referred to in this standard are listed on page 14. 3 Definitions For the purposes of this British Standard the following definitions apply. 3.1 photoelectric control unit a device which comprises a photoelec
18、tric sensor responding to variations in illuminance combined with means for switching an electric load 3.2 one-part control unit a photoelectric control unit in which the photoelectric sensor and the load-switching means are housed in the same enclosure 3.3 two-part control unit a photoelectric cont
19、rol unit in which the photoelectric sensor and the load switching means are housed in separate enclosures 3.4 detector that part of a two-part control unit which contains the photoelectric sensor 3.5 switching unit that part of a two-part control unit which contains the load-switching means 3.6 swit
20、ch-on level the illuminance at the photoelectric control unit which will cause it to change from the “off” to the “on” mode under standard test conditions 3.7 switch-off level the illuminance at the photoelectric control unit that will cause it to change from the “on” to the “off” mode under standar
21、d test conditions 3.8 on/off ratio the ratio of the measured switch-on level to the measured switch-off level 3.9 socket a receptacle into which a one-part control unit may be inserted 4 General test requirements 4.1 Tests according to this standard are type tests. NOTEThe marking of BS 5972 on an a
22、rticle implies that one or more representative products have complied with all the type test requirements of the relevant section of this standard. It does not necessarily mean that every article so marked has been individually tested in accordance with every requirement of the standard (see clause
23、6). 4.2 Unless otherwise specified in this standard PECU and sockets shall be tested in an ambient temperature of 25 5 C and at the rated voltage. The PECU and sockets shall be tested “as delivered” and as installed in normal use. Unless otherwise specified in this standard the tests are made on a s
24、ingle sample which shall withstand all the relevant tests. 5 Classification 5.1 Classification according to type of protection against electrical shock 5.1.1 Class I PECU or socket. A PECU or socket having at least functional insulation throughout and provided with an earth lead, an earthing termina
25、l or earthing contact, and, for PECU or sockets designed for connection by means of a flexible cable or cord, provided with either an appliance inlet with earthing contact, or a non-detachable flexible cable or cord with earthing conductor and a plug with an earthing contact. 5.1.2 Class II PECU or
26、socket. A PECU or socket with double insulation and/or reinforced insulation throughout and without provision for earthing. 5.2 Classification according to degree of protection against ingress of dust and moisture. PECU and sockets may be classified in accordance with the “IP number” system of class
27、ification as specified in BS 5490.BS5972:1980 2 BSI 06-1999 6 Marking 6.1 General. The following information shall distinctly and durably be marked on the PECU and socket, as appropriate, in a position where it can be seen during maintenance. In the list below, B indicates both shall be marked and P
28、 that only PECU are so marked. a) Mark of origin. (This may take the form of a trade mark, manufacturers identification mark, or the name of the responsible vendor.) (B) b) Manufacturers model number or type reference. (B) c) Rated supply voltage (in V). (B) d) Switched voltage rating if different f
29、rom above.(P) e) Rated current, i.e. 10 A. (B) f) Switch-on level (in lux). (P) g) Calendar and/or space for user to mark the year and month of installation. (P) In addition PECU or sockets complying with this specification may, at the manufacturers discretion, be marked with the number of this stan
30、dard (i.e.BS5972). NOTEMarking BS 5972 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the avai
31、lability of third party certification to support such claims should be addressed to the Director, British Standards Institution, Maylands Avenue, Hemel Hempstead, Herts HP2 4SQ in the case of certification marks administered by BSI or to the appropriate authority for other certification marks. 6.2 T
32、erminals. The terminals of a PECU or socket shall be marked to give a clear indication as to how they should be connected to ensure safe, satisfactory operation. Where terminals are marked with abbreviations the following symbols shall be used: 6.3 Test switch. Any test switch shall be clearly marke
33、d to indicate the switch position for automatic operation and for circuit testing. The following symbols shall be used: 6.4 Orientation. If the detector has to be mounted with particular orientation it shall be clearly and suitably marked. All sockets shall be marked with a direction arrow as specif
34、ied in clause 12. 6.5 Test for marking. The durability of the marking shall be checked by inspection and by trying to remove the marking by rubbing lightly for15 s with a piece of cloth soaked with water and for a further 15 s with a piece of cloth soaked with petroleum spirit. The marking shall be
35、legible after test. 6.6 Manufacturers instructions. The manufacturer shall supply instructions which shall include: a) a wiring diagram; b) instructions regarding any limitations of use (e.g. temperature) which are not marked on the control; c) instructions on orientation of the photoelectric sensor
36、s (where applicable). NOTEThe direction arrow on sockets for one-part control units described in 12.1 is provided for sensors designed to operate at a particular orientation, e.g. an arrow pointing to north (seealsoC.5). Section 2. Photoelectric control units 7 Construction 7.1 Mechanical strength.
37、Photoelectric control units shall be of adequate mechanical strength and so constructed as to withstand such handling and vibration as may be expected in normal use. Compliance shall be checked by the impact test described in 4.13 of BS 4533-101:1981. The test shall be applied using an impact energy
38、 of 0.50 Nm, with a spring compression of 20 mm. 7.2 Terminations. Terminals and supply connections shall comply with the requirements of section 14 or 15 of BS 4533-101. Fixings of electrical conductors through insulation material liable to shrinkage shall comply with the requirements of 4.11.1 of
39、BS 4533-101:1981. Terminals for supply connection to a two-part control shall allow the connection of conductors having nominal cross-sectional areas of 1.0 mm 2to2.5 mm 2in accordance with 5.2 of BS 4533-101:1981. The detector of a two-part control unit shall be provided with a cable or cord not le
40、ss than 500 mm in length. The insulation shall be capable of continuous usage at a temperature of 120 C. 7.3 Test switches. Any test switch incorporated in parallel with the PECU contacts shall have a current rating of at least 10 A. Line connection: L Neutral connection: N Load connection: Lo Cell
41、connection: C1 and C2 Switch position for testing circuit: Test Switching position for normal operation: AutoBS5972:1980 BSI 06-1999 3 7.4 Electrical contacts. The effectiveness of contacts and test switches shall each be checked separately by the following test. A test current of 11 A is passed bet
42、ween the contacts L and Lo. After a period of 4 h the voltage drop between L and Lo is measured and shall not exceed100 mV. NOTERequirements for solid-state switches are under consideration. 7.5 Resistance to the ingress of moisture. The enclosure of one-part controls, unless designed to be mounted
43、internally, and the detector of two-part controls shall be designed to be rain-proof. The body of a detector of a two-part control unit shall be designed to provide a rain-proof seal when inserted into a hole of 14 mm nominal diameter in the canopy of a lantern or other equipment. Compliance shall b
44、e checked by satisfying the appropriate test specified in clause 8 of BS 5490:1977 for protection IPX3. For the purpose of this test the control unit and its socket, if applicable, shall be mounted in accordance with the manufacturers installation instructions. The switching part of two-part control
45、s shall be designed to be drip-proof. Compliance shall be checked by satisfying the appropriate test specified in clause 8 of BS 5490:1977 for protection IPX2. 7.6 Fixings and dimensions. The switching unit of a two-part control unit shall incorporate a robust means of fixing. The dimensions of the
46、blade connections on three-blade one-part control units shall be as detailed in Figure 1. Compliance shall be checked by inspection. 8 Insulation resistance and electric strength 8.1 Humidity test. A one-part control, mounted in a socket, or a detector of a two-part control mounted in a hole on a me
47、tal plate to simulate the lantern canopy, shall be placed in a humidity cabinet containing air with the relative humidity maintained at between 91% and 95%. The temperature (t) of the air, at all places where the control can be located, shall be maintained within 1 C of any convenient value between
48、20 C and 30 C. Before being placed in the humidity cabinet the control unit shall be brought to a temperature between t and (t + 4) C. NOTEIn most cases, the control unit may be brought to the specified temperature between t and (t + 4) C by keeping it in a room at this temperature for at least 4 h
49、before the humidity treatment. The control unit shall be kept in the cabinet for 48h. After this treatment there shall be no visible damage and the marking shall still be legible. 8.2 Test sequence. The insulation resistance and the electric strength of photoelectric control units shall be checked by the insulation resistance test specified in 8.3 and the electric strength test specified in 8.4, these tests being made immediately after the treatment specified in 8.1 in the humidity cabinet or in the room in which the samples were brought to the pre
