1、BRITISH STANDARD BS 5620:1995 Specification for 200A1100V flameproof restrained and bolted plugs and sockets for use in coal mines UDC 744.42:62:003.63BS5620:1995 This British Standard, having been prepared under the directionof the Mining RequisitesStandards Policy Committee, was published underthe
2、 authority of the Standards Board and comes intoeffect on 15 February1995 BSI 07-1999 First published July1979 Second edition February1995 The following BSI references relate to the work on this standard: Committee reference MRE/14 Draft for comment90/74123 DC ISBN 0 580 23191 7 Committees responsib
3、le for this British Standard The preparation of this British Standard was entrusted by the Mining Requisites Standards Policy Committee (MRE/-) to Technical Committee MRE/14, upon which the following bodies were represented: Association of British Mining Equipment Companies British Cable Makers Conf
4、ederation British Coal Corporation Council for Electrical Equipment for Flammable Atmospheres (BEAMA Ltd.) Health and Safety Executive Amendments issued since publication Amd. No. Date CommentsBS5620:1995 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 R
5、eferences 1 3 Information and requirements to be agreed and documented 1 4 Definitions 1 5 Metallic components 2 6 Insulation 2 7 Contacts 3 8 Terminals 3 9 Plug 3 10 Socket 3 11 Closer caps for sockets 4 12 Plug and socket assembly 4 13 Plug coupling unit 4 14 Dimensions 5 15 Flameproof enclosure 5
6、 16 Type tests 5 17 Routine tests 6 18 Marking 7 Figure 1 Contact dispositions for alternative voltage modes 8 Figure 2 Type1 restrained plug (650 V mode) 9 Figure 3 Type1 bolted plug (650 V mode) 10 Figure 4 Type2 restrained plug 11 Figure 5 Type1 restrained socket (650 V mode) 12 Figure 6 Type1 bo
7、lted socket (650 V mode) 13 Figure 7 Type2 restrained socket 14 Figure 8 Type1 flameproof closure cap for restrained sockets 15 Figure 9 Type1 flameproof closure cap for bolted sockets 15 Figure 10 Type2 flameproof closure cap for restrained sockets 16 Table 1 Properties of electrical insulating mat
8、erials 2 Table 2 Test mandrel dimensions 6 Table 3 Contact tube conditioning data 7 List of references Inside back coverBS5620:1995 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Mining Requisites Standards Policy Committee. It supersedes BS5620:1979 which
9、 is withdrawn. BS5620:1979 specified requirements for650 V single voltage units and for650/1100 V dual voltage units. This revision also specifies requirements for1100V single voltage units. Due cognizance is taken of the relevant requirements of BS4683-2, BS5501-1 and BS5501-5. The standard continu
10、es to ensure interchangeability of plugs in sockets of different makes and to standardize the fixing dimensions of sockets. Whilst specifying some electrical and mechanical requirements, the standard does not purport to provide a fully detailed design. A British Standard does not purport to include
11、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. Act 1974, the Mines and Quarrie
12、s Act 1954, the Regulations made under these Acts, and also any other appropriate statutory requirements or bye-laws. These place responsibility for complying with certain specific safety requirements on the manufacturer and the user. The addresses of the recognized certification authorities in the
13、UK for Group I (coal mining) apparatus for flameproof safety purposes are as follows: 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
14、 front cover, an inside front cover, pagesi andii, pages1 to16, 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.BS5620:1995 BSI 07-1999 1 1 Sco
15、pe This British Standard specifies the constructional and test requirements for200A flameproof restrained and bolted plugs, sockets and plug coupling units suitable for single voltages of650V and1100V and dual voltage of650/1100V. They are primarily intended for use with mining apparatus which is co
16、nnected to its power supply by means of a flexible cable. Three types are covered and designated as: type 1S: 200 A,650 V single voltage, restrained and bolted; type 1D: 200 A,650/1100 V dual voltage, restrained and bolted; type2: 200 A,1100 V single voltage, restrained only. Type1 and2 configuratio
17、ns are not interchangeable. The plugs, sockets and plug coupling units incorporate three power contacts, a pilot contact for electrical interlocking and a scraping earth contact. The dual voltage plugs and sockets are intended for use either on a650V or1100V supply, the appropriate arrangements incl
18、uding selection of voltage by orientation of insulator and pins to ensure non-interchangeability for other than the appropriate voltage. In addition to the definitive requirements, this standard also requires the items detailed in clause3 to be documented. For compliance with this standard, both the
19、 definitive requirements and the documented items have to be satisfied. NOTEThe figures in this standard show only those features and dimensions essential for function interchangeability. 2 References 2.1 Normative references This British Standard incorporates, by dated or undated reference, provisi
20、ons from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies: any subsequent amendments to or revisions of the cited publication apply to thi
21、s British Standard only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 2.2 Informative references This standard refers to other publications that provide information or guidance.
22、Editions of these publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Information and requirements to be agreed and to be documented The following information to be supplied by the purchaser shall be f
23、ully 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 and date of this British Standard, i.e. BS5620:1994. b) Type of plugs and/o
24、r sockets required, i.e.restrained or bolted types 1S, 1D or2 and, for sockets, whether of the fixed or coupler variety. c) Nominal size of cable conductors (inmm 2 ). d) Type of cable, if made to a British Standard or other recognized standard specification, the appropriate standard number; for non
25、-standard cables, complete details of the cable construction and dimensions should be given. 4 Definitions For the purposes of this British Standard the following definitions apply. 4.1 plug and socket a device consisting of two portions having metallic contacts and arranged to engage with each othe
26、r, so forming a ready means of connecting or disconnecting current-using apparatus to or from the source of electrical supply 4.2 flameproof plug and socket a plug and socket which, when its parts are properly assembled together with the cable attached, conforms to the relevant flameproof requiremen
27、ts 4.3 restrained plug and socket a plug and socket in which the two portions are engaged, retained and disengaged by means of a manually operated device 4.4 bolted plug and socket a plug and socket designed to be held together by two or more bolts or screws, or studs and nuts, in such a way that th
28、e plug and socket cannot be disengaged without the use of a tool 4.5 plug coupling unit an assembly incorporating two socket entries providing for the insertion and engagement of plugsBS5620:1995 2 BSI 07-1999 4.6 plug that portion of a plug and socket having contacts consisting of tubes and which i
29、s attached to a flexible cable 4.7 socket that portion of a plug and socket having contacts consisting of pins and which is designed for the insertion and engagement of a plug 4.8 scraping earthing contact a device to ensure electrical continuity of the earthing connection between a plug and socket
30、4.9 cable gland a device designed to secure the end of a cable, by means appropriate to the type of cable, and which may include provision for making electrical connection to any screen or metallic covering 4.10 closer cap a cap primarily intended for blanking off motor sockets (see note to clause11
31、) 5 Metallic components The material for external components and enclosures shall be one of the following: a) a corrosion resistant ferrous alloy; or b) a non-ferrous metal, other than aluminium, magnesium, or titanium; or c) an alloy containing the metals aluminium, magnesium and titanium, either s
32、ingly or in combination, providing that the total content of these constituents does not exceed15% by mass of the alloy and the combined content of magnesium and titanium does not exceed6% by mass of the alloy. NOTEThese limits have been imposed to avoid the hazards of incendiary sparking due to fri
33、ction between rusted steel or iron and the metals in question. 6 Insulation 6.1 Insulation materials The material used for insulating the contact tubes and pins shall conform toTable 1. 6.2 Insulators Insulators shall be free from voids, cracks and deleterious inclusions and shall be capable of with
34、standing the test specified in16.8. 6.3 Additional requirements for type 1D and type2 plugs and sockets The insulator, whether for plug or for socket, shall incorporate a metal separator between each of the contact housings. The separator shall be of cruciform section moulded integrally with the ins
35、ulator such that the fins are located midway between the respective contact housings. The separator shall extend as near as is practicable to the ends of the insulator, and the radial length of each fin shall be such that the radial distance between the tip of the fin and the outer surface of the in
36、sulator is not greater than13mm. There shall be visible indication at the front of the insulator that a separator has been incorporated. Part of the separator shall be exposed at the front end for electrical test. The separator shall be bonded to the case of the plug or socket. Table 1 Properties of
37、 electrical insulating materials Property Value Test method Electric strength (90 C) Volume resistivity Tensile strength Flexural strength Impact strength Water absorption c Comparative tracking index c Oxygen index d 8 kV/mm (min.) 1 10 137cm (min.) 34.5 N/mm 2(min.) 60 N/mm 2(min.) 10 kJ/m 2(min.)
38、 50 mg (max.) CTI 400 (min.) 28 % (min.) BS 2782:Method 220 or 221 a BS2782:Method 230A b BS 2782:Method 320D BS 2782:Method 335A BS 2782:Method 359 BS 2782:Method 430A BS 5901 BS 2782:Method 141 NOTE1 N/mm 2= 1 MPa. a Also numbered BS903-C4. b Also numbered BS903-C2. c Preparatory to any testing fo
39、r these properties, remove not less than0.5mm by machining from all the surfaces of the test specimen and then smoothly finish. d This is a minimum requirement. Insulation forming a part of the flameproof path will additionally need to satisfy the requirements of BS5501-5 with respect to flammabilit
40、y.BS5620:1995 BSI 07-1999 3 7 Contacts Each plug and socket shall be provided with three power contacts and one pilot contact (contact tubes or contact pins, as may be appropriate) arranged for the appropriate voltage mode as inFigure 1. 8 Terminals 8.1 Power and pilot Terminals of power contact tub
41、es and pins shall be capable of being bored to a diameter from6mm up to13mm. Unless otherwise specified by the purchaser they shall be supplied bored to a diameter of6mm. Terminals of pilot contact tubes and pins shall be capable of being bored to a diameter from4mm up to10mm. Unless otherwise speci
42、fied by the purchaser they shall be supplied bored to a diameter of4mm. Terminals shall be integral with contact tubes and contact pins; this does not preclude the use of dissimilar metals for contacts and terminals. Where screws are used as a clamping device on a terminal, not less than two such sc
43、rews shall be provided and they shall be flat point hexagon socket set screws conforming to BS4168-2. Each plug terminal shall provide for the entry of the conductor to a depth of at least25mm. Each socket terminal shall provide for the entry of the conductor to a depth of at least18mm. 8.2 Earthing
44、 Earthing terminals shall be provided in the plugs and shall be capable of securely accommodating conductors of6mm 2to50mm 2cross-sectional area. Additional terminals shall be provided to accommodate securely any metallic cable screens. 9 Plug 9.1 Case The general dimensions of the case of the type1
45、S and1D plug shall be as given inFigure 2 and Figure 3 and for the type2 as given inFigure 4. The engaging portion of the case of the plug which protects the contact tubes shall be of metal having a tensile strength of not less than450 N/mm 2when determined in accordance with the test methods given
46、in BSEN10002-1. The remaining part of the case shall be of metalhaving a tensile strength of not less than225N/mm 2 . The external surface of the engaging portion of the plug casing shall form part of a scraping earthing contact and shall be electrically continuous with the remainder of the plug cas
47、ing (see10.3). 9.2 Contact tubes (power and pilot) The dimensions of the tubes shall be as shown inFigure 2 orFigure 3 as appropriate, for types1S and1D and inFigure 4 for type2. When assembled they shall be self-adjusting to the extent necessary to accommodate at least the permitted tolerances on p
48、osition. The tubes shall be of any suitable metal having both a hardness of not less than70 HB when determined in accordance with BS240, and a volume resistivity of not more than1147cm at a temperature of20 C. Contact tubes shall make good electrical contact with the pins when the plug is inserted i
49、n the socket. The effectiveness of contact shall be proved by conformity to the requirements of16.1 to16.4 and16.6. 9.3 Cable glands A cable gland shall be provided, suitable for the size and type of cable to be accommodated, up to a maximum overall diameter of60mm. Cable glands shall be of a compression type and shall be provided with means: a) to satisfy the relevant requirements of BS5501-1 and BS5501-5 for cable entries for Group I apparatus; b) to secure the cable; and c) to seal the assembly against ingress of moisture. Where a pliable
