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1、BRITISH STANDARD BS 5266-3: 1981 Emergency lighting Part 3: Specification for small power relays (electromagnetic) for emergency lighting applications up to and including 32 A UDC 628.93.041:621.311.8:621.318.5 BS 5266-3:1981 This British Standard, having been prepared under the direction of the Gen
2、eral Electrotechnical Engineering Standards Committee, was published under the authority of the Executive Board and comes into effect on 30 January 1981 BSI 11-1998 The following BSI references relate to the work on this standard: Committee reference GEL/5 Draft for comment 76/28676 DC ISBN 0 580 11
3、576 3 Cooperating organizations The General Electrotechnical Engineering Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following: Associated Offices Technical Committee British Approvals Service for Electric Cables Ltd. British El
4、ectrical and Allied Manufacturers Association (BEAMA) British Radio Equipment Manufacturers Association British Steel Corporation Department of Energy (Electricity) Electric Cable Makers Confederation Electrical Contractors Association Electrical Contractors Association of Scotland Electrical Resear
5、ch Association Electricity Supply Industry in England and Wales* Electronic Components Industry Federation* Engineering Equipment Users Association* Health and Safety Executive Home Office Institution of Electrical Engineers* Ministry of Defence* National Coal Board Oil Companies Materials Associati
6、on Post Office* Telecommunication Engineering and Manufacturing Association (TEMA)* The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Consulting
7、Engineers Association of Control Manufacturers (Tacma) (BEAMA) Association of Manufacturers Allied to the Electrical and Electronic Industry (BEAMA) Cinematograph Exhibitors Association of Great Britain and Ireland Control and Automation Manufacturers Association (BEAMA) Electronic Engineering Assoc
8、iation Greater London Council National Supervising Inspectorate Society of British Aerospace Companies Limited The Transmission and Distribution Association (BEAMA) Amendments issued since publication Amd. No.Date of issueComments BS 5266-3:1981 BSI 11-1998i Contents Page Cooperating organizations I
9、nside front cover Foreword ii 1 Scope 1 2 References 1 3 Standard conditions for construction 1 3.1 Mechanical design 1 3.2 Electrical design 1 3.3 Coil circuits 4 4 Marking 4 5 Ordering information 4 6 Routine tests 4 6.1 General 4 6.2 Performance characteristics 4 6.3 Voltage proof 4 6.4 Contact c
10、ircuit resistance 5 7. Type and qualification tests 5 7.1 General 5 7.2 Mechanical endurance 5 7.3 Electrical endurance 5 7.4 Insulation resistance5 7.5 Environmental tests 5 7.6 Contact contamination 6 Table 1 Maximum screw fixing torques 1 Table 2 Clearance and creepage distances 2 Table 3 Voltage
11、 proof: test voltages 3 Table 4 Dimensions of pillar terminals 6 Table 5 Dimensions of screw terminals 6 Table 6 Dimensions of stud terminals 7 Publications referred to Inside back cover BS 5266-3:1981 ii BSI 11-1998 Foreword This Part of this British Standard has been prepared under the direction o
12、f the General Electrotechnical Engineering Standards Committee. BS 764 (confirmed 1974) is an established specification for automatic changeover contactors, which are generally used for the centralized control of emergency lighting systems. The practice has developed over the years of employing smal
13、l power relays which may be used to control small systems and individual luminaires. These small power relays are sufficiently different from the contactors specified in BS 764 to make it necessary for them to be specified in a separate standard. The purpose of this standard is to provide a specific
14、ation for small power relays which, as well as transferring small systems to an emergency supply, are also used to control a small number of lamps, including a single unit, and which may be compact enough to be housed within a luminaire. A British Standard does not purport to include all the necessa
15、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, pages i and ii, pages 1
16、to 8, an inside back cover 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. BS 5266-3:1981 BSI 11-19981 1 Scope 1.1 This standard specifies the performance characte
17、ristics of relays capable of transferring an emergency lighting load from a normal source of supply to an emergency supply when the normal source of supply fails; or connecting an emergency lighting load when de-energized, and disconnecting an emergency lighting load when energized. NOTEThe use of r
18、elays satisfying the performance requirements of this specification does not necessarily ensure the maintenance of adequate lighting under emergency conditions and it may be necessary to fit ancillary equipment. 1.2 The object of this standard is: a) to draw attention to the need for the relay to be
19、 able to make a reliable and positive transfer of the emergency lighting load to the emergency supply after being in the normally energized position for an extended period of time, e.g. 12 months; b) to specify tests to confirm that these conditions have been fulfilled and to describe the methods to
20、 be adopted for these tests. 2 References The titles of the standards publications referred to in this standard are listed on the inside back cover. 3 Standard conditions for construction 3.1 Mechanical design 3.1.1 General. The relay shall always “fail safe” by automatically taking up the emergency
21、 supply position. 3.1.1.1 The following shall not be used. a) Any latch arrangement to retain the transfer switch in any position. b) Any electrical energy to cause the transfer switch to change to the emergency position. 3.1.1.2 Insulating materials shall be classified in accordance with BS 2757. 3
22、.1.1.3 All plastics materials used shall be tested for the rate of burning in accordance with method 508A of BS 2782:1970. Three specimens of each material shall not burn to the first mark and any flame or after-glow, after removal of the burner, shall not endure for more than five seconds. 3.1.2 Te
23、rminals. Where screw terminals are used, they shall be such that they cannot turn or be displaced when the connecting screws are tightened, and such that the connectors cannot become displaced and the necessary pressure on the conductor is maintained permanently. No contact pressure shall be transmi
24、tted through insulating materials, and the gripping of the conductor shall take place between metal surfaces. Where snap-on connectors are used, they shall be suitably protected against corrosion. Terminal screw sizes shall be in accordance with Tables 15, 16 and 17 of BS 3456-101:1978. Appropriate
25、extracts from these tables are shown in Table 4, Table 5 and Table 6 respectively. The maximum torques to be applied to screw fixings shall be as shown in Table 1. Table 1 Maximum screw fixing torques 3.1.3 Contact contamination. The construction shall be such that deterioration greater than that sp
26、ecified in 7.6 does not occur. 3.1.4 Mounting. Provision for secure mounting shall be made as well as means to prevent movement in any plane when fixed. Plug-in relays shall be equipped with a retaining device. 3.1.5 Ambient temperature. The ambient temperature range shall be from 10 C to + 55 C. 3.
27、2 Electrical design 3.2.1 Clearance and creepage distances. Clearance and creepage distances shall be not less than the values given in Table 2. 3.2.2 Coils 3.2.2.1 All coils shall be capable of withstanding the continuous application of 110 % of rated voltage over the ambient temperature range. Nom
28、inal thread diameter Screws without heads not protruding from the hole when tightened Others mmN mN m 3.00.250.5 3.50.40.8 4.00.71.2 BS 5266-3:1981 2 BSI 11-1998 Table 2 Clearance and creepage distances NOTESee also explanation of terms on page 3. Type of insulation Dimensions in mm required for wor
29、king voltsb Up to 50a Over 50 and up to 130Over 130 and up to 250Over 250 Clearance Creepage with CTIh ClearanceCreepage with CTIClearanceCreepage with CTIClearanceCreepage with CTI 120 174 175 249 250 699 over 700 120 174 175 249 250 699 over 700 120 174 175 249 250 699 over 700 120 174 175 249 250
30、 699 over 700 Operational insulationfg Sealed Encapsulated0.30.50.40.30.30.50.80.70.60.50.91.41.21.00.91.32.11.81.51.3 Clean0.40.60.50.40.40.61.00.80.70.61.01.71.41.21.01.52.42.11.81.5 Normal0.50.80.70.60.50.81.41.21.00.81.42.32.01.71.42.13.42.82.42.1 Dirty0.81.41.10.80.81.22.01.71.41.22.03.42.82.32
31、.02.84.84.03.42.8 Wet-dirty1.12.11.71.41.11.73.02.52.01.72.84.84.93.42.84.06.85.74.84.0 Basic insulationef Clean0.40.80.60.50.40.71.21.00.80.71.22.01.71.41.21.82.82.42.11.8 Normal0.61.10.90.80.61.01.71.41.21.01.72.82.32.01.72.44.03.42.82.4 Dirty0.81.71.41.10.81.42.52.01.71.42.34.03.42.82.33.45.74.84
32、.03.4 Wet-dirty1.42.62.11.71.42.03.63.02.52.03.45.74.84.03.44.88.06.85.74.8 Across full disconnection As for basic protective insulation, but see footnotec Across microdisconnectionAs for operational insulation, but see footnotesc andd Across microinterruptionThere are no requirements other than bet
33、ween terminals and terminations. Between terminals and terminations the requirements are as for operational insulation. a The values specified apply to circuits operating at safety extra-low voltage. The values specified for operational insulation apply to all classes of insulation. b If the working
34、 voltage across creepage distances and clearances for other than operational insulation is less than the rated voltage of the control, the working voltage is assumed to be equal to the rated voltage. c If the contact member is of the same material and design as the actual contact, the contact member
35、 is considered to be part of the contact. In double-break controls the creepage distances and clearances between parts separated by the action of the control are considered to be the sum of the distances for each part of the double break. For full disconnection, each part of a double break should be
36、 at least one-third of the prescribed distance. d The clearances specified apply neither to the separation between contacts, nor between those current-carrying parts where the clearance varies with the movement of the contacts; for such clearances no value is specified. For clearances between parts,
37、 other than for terminals and terminations, the values specified may be reduced to a value not less than that of the contact separation, provided the design is such that these clearances cannot be reduced by displacement of the parts concerned, and are at least: 0.5 mm for working voltages up to and
38、 including 250 V; 1.0 mm for working voltages over 250 V up to and including 380 V; 2.0 mm for working voltages over 380 V. e For double insulation, if either of the two insulations satisfies the requirements for reinforced insulation, the requirements for the other insulation do not apply. f If the
39、 live part is a wire and is coated by a layer of lacquer or enamel that satisfies the requirements of 5.8 for grade 2 of BS 4520:1969, the distance may be reduced by 50 % for operational insulation and for basic insulation. g For operational insulation, any clearance, and any creepage distance over
40、insulating material with a CTI of 175 or greater, may be smaller than specified, provided that the control does not show any defect within the meaning of this specification, or does not reduce the safety of any appliances with which it is integrated or incorporated, if these clearances and creepage
41、distances are short-circuited consecutively. h Comparative tracking index; see, for example, BS 5901. BS 5266-3:1981 BSI 11-19983 Explanation of the terms used in Table 2 a) Operational insulation: the insulation between live parts that have a potential difference between them, and which is necessar
42、y for the correct operation of the equipment during its required life. This used to be referred to as part of that insulation known as “functional insulation”. b) Basic insulation: the insulation applied to live parts to provide basic protection against electric shock. It includes insulation between
43、 live parts and: 1) intermediate conductive parts or metal foil over intermediate insulating surfaces; 2) accessible conductive parts; 3) conductive parts connected to accessible conductive parts; 4) metal foil over accessible insulating surfaces. This used to be referred to as part of that insulati
44、on known as “functional insulation”. See also BS 2754:1976. c) Sealed situation: that when the distance, i.e. creepage or clearance distance, under consideration is within an evacuated or inert gas-filled enclosure that is permanently sealed. d) Encapsulated situation: that when the distance under c
45、onsideration is effectively protected against the ingress of moisture or dust by means of a seal, or cemented joint of cross-linked polymer or other similar material, or by the use of an encapsulated or moulded enclosure. e) Clean situation: that when the distance under consideration is not exposed
46、to the deposition of dirt, e.g. in the case of a close fitting cover, it is not necessary that this cover should be provided with a gasket or seal. f) Normal pollution situation: when the distance under consideration is exposed to the atmosphere prevailing in normal household premises, and when any
47、dust is only a loose deposit of non-conductive substance. g) Dirty situation: when the distance under consideration is exposed to a deposition of dust greater than in a normal pollution situation, particularly when the dust is partially conductive. h) Wet-dry situation: when the distance under consi
48、deration is either exposed to excessive condensation, or when moisture, together with conductive dust, is present. 3.2.2.2 Voltage ratings. The preferred voltage ratings are as follows: 3.2.2.3 Voltage proof. Coils shall withstand a voltage proof test carried out with the voltages given in Table 3,
49、without breakdown. The test shall be carried out in the manner described in 6.3. 3.2.2.4 Insulation resistance. Coil circuits shall comply with the following requirement subsequent to the relay being subjected to the electrical endurance test of 7.3. The insulation resistance of coil circuits shall be not less than 100 MV when tested in accordance with 7.4. 3.2.3 Relay contacts. All normally closed relay contact units shall break before normally open contact units make. Auxiliary contacts may be excluded