1、BRITISH STANDARD BS 5126-3: 1993 Mining type flameproof supply and control units for use on systems up to1100V Part 3: Specification for air-cooled lighting transformer unitsBS5126-3:1993 This British Standard, having been prepared under the directionof the Mining RequisitesStandards Policy Committe
2、e, waspublished underthe authorityof the Standards Boardand comes intoeffect on 15December1993 BSI 09-1999 First published May1982 Second edition December1993 The following BSI references relate to the work on this standard: Committee reference MRE/16 Draft for comment91/75762 DC ISBN 0 580 22423 6
3、Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Mining Requisites Standards Policy Committee (MRE/-) to Technical Committee MRE/16, upon which the following bodies were represented: Association of British Mining Equipment Companies Briti
4、sh Coal Corporation Health and Safety Executive Amendments issued since publication Amd. No. Date CommentsBS5126-3:1993 BSI 09-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definitions 1 4 Information and requirements to be agreed and to be doc
5、umented 2 5 Service conditions 2 6 Rated values 2 7 Design and construction 3 8 Verification and tests 8 9 Marking 9 Figure 1 Outline of enclosures showing arrangements for earthing terminals and skid couplings 10 Figure 2 Busbar chamber end flange 11 Figure 3 Busbar interconnecting trunk with cover
6、 plate 12 Figure 4 650/1100 V busbar interconnecting adaptor trunk 13 Figure 5 650/1100 V skid coupling plate 14 Figure 6 End cover for busbar chamber 15 Figure 7 Envelope dimensions for padlocks 16 Table 1 Creepage distance and clearance 7 List of references 18BS5126-3:1993 ii BSI 09-1999 Foreword
7、This Part of BS5126has been prepared under the direction of the Mining Requisites Standards Policy Committee. It supersedes BS5126-3:1982, which is withdrawn. This revision updates the standard to reflect todays usage of1100V mining type flameproof supply and control units (commonly known in the UK
8、as“gate-end boxes”) and takes account of expected future development. This Part of BS5126covers units in which the essential apparatus are lighting transformer units, whilst Parts1, 2and4cover motor starters, circuit breaker units and units to power drilling machines, respectively. All have standard
9、 busbar and other fixing dimensions, enabling the different units to be fastened together to form a switchboard. This standard is arranged to be in close alignment with IEC (International Electrotechnical Commission) criteria for various electrical features. A British Standard does not purport to in
10、clude all the necessary 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. Attention is drawn to the Health and Safety at Work etc. Act19741, the Mines and Q
11、uarries Act19542, the Regulations made under these Acts, and also any other appropriate statutory requirements or byelaws. These place responsibility for complying with certain specific safety requirements on the manufacturer and the user. The addresses of the recognized certification authorities in
12、 the United Kingdom for Group I (mines susceptible to firedamp) apparatus are: Health and Safety Executive Mining Equipment Certification Service Harpur Hill, Buxton, Derbyshire, SK17 9JN SIRA Certification Service Saighton Lane Saighton Chester, CH3 6EG Summary of pages This document comprises a fr
13、ont cover, an inside front cover, pagesiand ii, pages1 to 18, 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.BS5126-3:1993 BSI 09-1999 1 1 Sco
14、pe This Part of BS5126specifies requirements for flameproof supply and control units designed primarily for use in the coal mining industry on1100V three-phase a.c. circuits containing single-phase transformers intended for supplying lighting and other circuits. In addition to the definitive require
15、ments, this standard also requires the items detailed in clause 4 to be documented. For compliance with this standard, both the definitive requirements and the documented items have to be satisfied. NOTE 1To facilitate cross-reference and subject location recall between the Parts of this standard, a
16、 uniformity of clause arrangements is maintained. At subclause level, because of the different purposes and individual technical features of the four types of control unit, some differences in title and/or subclause arrangements have been unavoidable, but have been made without disturbing the genera
17、l pattern. Thus, in this Part, subclauses7.11 and7.14 remain unused. NOTE 2The figures in this standard show only such features and dimensions essential for function and interchangeability. Dimensions are in millimetres. Untoleranced values less than100mm are 0.15mm and those greater than100mm are 0
18、.25mm. 2 References 2.1 Normative references This Part of BS5126incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on pages18 and 19. Subsequent amendments to,
19、 or revisions of, any of these publications apply to this Part of BS5126only when incorporated in it by updating or revision. 2.2 Informative references This Part of BS5126refers to other publications that provide information or guidance. Editions of these publications current at the time of issue o
20、f this standard are listed on the pages 18 and 19, but reference should be made to the latest editions. 3 Definitions For the purposes of this Part of BS5126, the following definitions apply. 1) 3.1 supply and control unit (gate-end box) a flameproof enclosure containing electrical apparatus, such a
21、s transformers, control gear, switchgear and/or protective gear, designed primarily for use underground NOTE 1In this Part of BS5126, the term “unit” has in many instances been used in abbreviation of “supply and control unit”. NOTE 2For the purposes of this Part of BS5126, the enclosed apparatus is
22、 essentially a single-phase air-cooled transformer with associated equipment to provide a supply for lighting purposes. 3.2 switch disconnector (isolating switch) a switch which isolates a circuit and is capable of breaking not less than its rated current at rated voltage 3.3 cable half coupler (fli
23、t plug) a detachable cable sealing box utilizing contact tubes and pins to facilitate ready connection to, or disconnection from, a similar unit or other apparatus 3.4 cable coupler adaptor a device used to connect either a cable half coupler or other type of cable termination to apparatus. If used
24、to connect a cable half coupler, it may either be separate from, or be integral with, the enclosure of the apparatus 3.5 cable sealing box a device designed to receive and protect the end of the cable, with provision for sealing the conductors and the insulating material of the cable with a filling
25、compound and having a cable gland for attaching the cable to the box, together with any terminals provided for connection to the conductors of the cable within the box. The box may form part of, or be detachable from, the apparatus with which it is associated 3.6 detachable cable sealing box a cable
26、 sealing box that can be detached from associated apparatus without disturbing the sealing of the cable 3.7 bolted cable plug and socket a plug and a socket designed to be held together by two or more bolts or screws, or studs and nuts, in such a way that the plug cannot be disengaged from the socke
27、t without the use of a tool 3.8 overcurrent protection a device that causes the circuit being protected to be automatically disconnected from the supply when the current exceeds the predetermined value NOTEThe preferred term “overcurrent” is used throughout this standard, but in certain other Britis
28、h Standards to which reference is made, the term “overload” may be used when referring to these devices. 1) The terms in brackets are those commonly used in practice.BS5126-3:1993 2 BSI 09-1999 4 Information and requirements to beagreed and to be documented 4.1 Information to be supplied by the purc
29、haser The following information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specified throughout the standard and the following documented items shall be satisfied before a claim of compliance with the standard can be made and verified. a) the number a
30、nd date of this British Standard,i.e. BS5126-3:1993; b) the service conditions, if other than those specified inclause 5; c) information relating to the lighting to be controlled, where known: 1) the type of lighting, e.g. incandescent, fluorescent or gas discharge; 2) any information concerning spe
31、cial conditions likely to affect the performance of the transformer; d) any information concerning special conditions likely to affect the performance of the unit; e) the voltage, if less than1100V (see6.1); f) the rated frequency of the supply system and its deviation if greater than 2Hz (see6.2);
32、g) the no-load output voltage (see6.3); h) the rated kilovolt-ampere output (see6.4); i) the rated thermal current of busbars (see6.5); j) whether two or more units are to be coupled together (see7.4); k) whether provision for incoming and throughgoing cable fittings is required at one or both ends
33、of the unit, and the type of fitting required (see7.6.1); l) the type of outgoing cable fittings, together with the number, if any, of the auxiliary cable fittings needed, and the number of outgoing circuits, if other than the minimum (see7.6.2); m) whether any auxiliary circuits are to be connected
34、 across the power circuit (see7.10.4); n) live compartment indication in the switch disconnector chamber (see7.16); o) the testing authority for type tests, if other than the manufacturer (see8.1.2); p) the certifying authority, if other than a UK authority (see foreword). 4.2 Items to be agreed bet
35、ween the contracting parties The following items to be agreed between the contracting parties, which are specified in the clauses referred to, shall be fully documented. Both the definitive requirements specified throughout the standard and the following documented items shall be satisfied before a
36、claim of compliance with the standard can be made and verified. a) the secondary means of isolation of the outgoing circuit, if other than a switch disconnector; the number of outgoing circuits if other than the minimum three (see 7.8.2); b) additional protection to take account of overloading (see7
37、.10.1.1); c) whether earth fault electrical lockout is to be fitted (see7.10.3); d) the terminals to be marked and the information to be displayed (see9.2); e) the form of the diagrams (see9.5). 5 Service conditions Within the limits of their ratings, units shall be suitable for use in installations
38、 operating under the intended service conditions. Unless otherwise specified by the purchaser see4.1 b), the service conditions shall be not more severe than the following. a) Ambient temperature: a peak value not exceeding40 C with an average value not exceeding35 C over24h periods. The lower limit
39、 of the ambient temperature is 5 C. b) Altitude: an altitude at the site of installation not exceeding2000m (6600ft) above sea-level. 6 Rated values 6.1 Supply voltage The maximum rated supply voltage shall be1100V. Units shall operate normally within the limits of 10% and + 6% of the declared rated
40、 supply voltage. Voltages less than 1100V shall be specified by the purchaser see 4.1 e). 6.2 Supply frequency Units shall have a rated supply frequency within the range40Hz to62Hz. The purchaser shall state the supply frequency required, and its deviation if greater than 2Hz, on the enquiry and/or
41、order see 4.1 f). NOTEThe standard frequency is50Hz. The normal deviation is not greater than 2Hz.BS5126-3:1993 BSI 09-1999 3 6.3 Output voltage Unless otherwise specified by the purchaser see4.1 g), the no-load output voltage shall be one of the following: a) 125V; b) 250V; c) dual-voltage125/250V.
42、 6.4 Kilovolt-ampere output Unless otherwise specified by the purchaser see4.1 h), the rated kilovolt-ampere output shall be one of the following: a) 1.0kVA; b) 2.5kVA; c) 5.0kVA. 6.5 Thermal current of busbars The rated thermal current of busbars shall be stated. Unless otherwise specified by the p
43、urchaser see4.1 i), the value shall be one of the following: a) 300A; b) 400A. 7 Design and construction 7.1 General The flameproof parts of a unit shall conform to one of the following standards: a) BS4683-2:1971; b) BS5501-5:1977; c) BS6709:1986; for Group I enclosures, with fittings in accordance
44、 with 7.4, 7.5 and 7.6. However, units designed and certified before the date of publication of this standard, which have been certified as flameproof inaccordance with BS229for Group, I gas (methane/firedamp), shall be deemed to conform to this standard provided that the requirements of all other c
45、lauses are met. The design and construction of units shall minimize the risk of inadvertent closure of relays or contactors arising from either: 1) pressure changes within the enclosure; or 2) changes in the parameters of electronic components or programmable electronic systems due to variations in
46、temperature or electrical interference. Any circuits required to be intrinsically safe shall conform to BS1259:1958appropriate to Class1, or BS5501-7:1977appropriate to Group I. NOTE 1Where a unit conforming to this standard and to BS5501is to be directly connected to apparatus conforming to BS229or
47、 BS1259or BS4683, it may be necessary to construct the unit such that it conforms to BS6709. NOTE 2Where a unit is not to be connected as in note1, in order to promote the increasing use of BS5501in parallel with the progressive phasing out of Group I apparatus conforming to earlier standards, such
48、a unit should conform to BS5501. The material for external components and enclosures shall be one of the following: i) a corrosion resistant ferrous alloy; or ii) a non-ferrous metal, other than aluminium, magnesium or titanium; or iii) an alloy containing the metals aluminium, magnesium, titanium,
49、either singly or in combinations, providing that the total contentofthese three constituents does not exceed15 % (m/m) of the alloy and the combined content of magnesium and titanium does not exceed6% (m/m) of alloy. NOTE 3These limitations have been imposed to avoid the hazards of incendive sparking due to friction between rusted steel or iron and the metals listed. 7.2 Supply and control unit assembly NOTEA supply and control unit comprises a basic unit together with optional features. The basic unit shall conform to the follow
