1、BRITISH STANDARD BS 6709:1986 Specification for Interconnection of electrical apparatus, constructed to two or more British Standards, for use in mines susceptible to firedamp UDC 621.313.062:622.812BS6709:1986 This British Standard, having been prepared under the directionof the Mining and Quarryin
2、g Requisites Standards Committee, was published underthe authority of the Executive Board on 31July1986 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference MQE/28 Draft for comment85/72817 DC ISBN 0580 15132 8 Committees responsible for this British Stan
3、dard The publication of this British Standard was entrusted by the Mining and Quarrying Requisites Standards Committee (MQE/-) to Technical Committee MQE/28 upon which the following bodies were represented: Association of British Mining Equipment Companies Council for Electrical Equipment for Flamma
4、ble Atmospheres (BEAMA) Health and Safety Executive National Coal Board Amendments issued since publication Amd. No. Date of issue CommentsBS6709:1986 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii Section 1. General 1.0 Introduction 1 1.1 Scope 1 Section 2. Flamep
5、roof interconnected apparatus 2.1 General 2 2.2 Design and construction 2 2.3 Verification and tests 2 2.4 Documentation 2 2.5 Marking 2 Section 3. Interconnected apparatus with mixed types of protection excluding intrinsic safety 3.1 General 3 3.2 Design and construction 3 3.3 Verification and test
6、s 3 3.4 Documentation 3 3.5 Marking 3 Section 4. Apparatus comprising intrinsically safe circuits interconnected within protective enclosures 4.1 General 5 4.2 Design and construction 5 4.3 Verification and tests 5 4.4 Documentation 5 4.5 Marking 5 Section 5. Interconnected intrinsically safe system
7、s 5.1 General 7 5.2 Design and construction 7 5.3 Verification and tests 7 5.4 Documentation 7 5.5 Marking 7 Appendix A The registered mark for flameproof apparatus 8 Appendix B Methods of legible and durable marking 8 Appendix C Example of interconnection of type d and type e apparatus 9 Figure 1 R
8、egistered mark for flameproof apparatus 8 Figure 2 Interconnection of type d and type e apparatus 9 Publications referred to Inside back coverBS6709:1986 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Mining and Quarrying Requisites Standards Committee. A
9、British Standard does not purport to include 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
10、 at Work etc. Act1974, the Mines and Quarries Act1954, 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 address of the reco
11、gnized certification authority in the United Kingdom for Group I mining apparatus is as follows: Health and Safety Executive HSE(M) Certification Support Unit Harpur Hill, Buxton, Derbyshire SK17 9JN. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, page
12、s1 to 10, 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 theinside front cover.BS6709:1986 BSI 07-1999 1 Section 1. General 1.0 Introduction For several decades elec
13、trical apparatus 1) , including systems and components, for use in mines susceptible to firedamp (Group I 2)apparatus) has been designed and constructed in accordance with BS229, BS1259 and/or BS4683 as appropriate. So far as the gas ignition risk is concerned, such apparatus satisfies the legal req
14、uirements applying to the use of electricity where potentially explosive atmospheres can occur below ground. Virtually all the electrical apparatus currently in use in mines is of this type and most has considerable further expectation of life. Following the publication of BS5501-1 to BS5501-7in1977
15、, implementing European Standards EN50014 to EN50020, and of BS5501-9in1982, implementing EuropeanStandard EN50039, in accordance with the responsibilities of the United Kingdom as a member of CENELEC, the mining interests in the United Kingdom have recognized the need for, and the benefit of, requi
16、ring that new Group I apparatus complies with BS5501. The certification and use of individual self-contained items of Group I apparatus, e.g.hand-held apparatus, complying solely with BS5501 present no problems. However, any claim or certificate of compliance with BS5501 would be invalidated by any
17、deviations from the requirements of BS5501 that may be necessary to provide for the functional electrical and/or mechanical connecting of such apparatus with apparatus complying with (or that would otherwise be required to comply with) the previously established standards (i.e.BS229,etc.). In these
18、circumstances, this standard has been prepared to meet two objectives: a) to specify technical requirements for Group I apparatus in accordance with which a manufacturer may submit new items that are generally in accordance with BS5501 for use as functionally connected units or systems with existing
19、 apparatus generally in accordance with BS229, etc., for the certification and approval necessary to permit the use of the functionally connected units or systems in the potentially explosive atmospheres that occur in mines susceptible to firedamp; b) to promote the increasing use of BS5501 for Grou
20、p I apparatus in parallel with the progressive phasing out of Group I apparatus in accordance with the earlier standards and thereby to minimize barriers to trade in keeping with the commitments of the United Kingdom within the European Community. It is anticipated that this standard will only be ne
21、cessary for a transitional period, after which it will be withdrawn. 1.1 Scope This British Standard specifies requirements for the construction and testing of interconnected electrical apparatus, including systems and components 1) , for use in mines susceptible to firedamp. NOTE 1The means of inte
22、rconnection covered by this standard may be electrical, mechanical or involve the housing of one constituent within another. This standard applies in circumstances where new apparatus, that has been designed and constructed generally in accordance with BS5501, cannot fully comply with BS5501 because
23、 of the provision made for connection by electrical and/or mechanical means to existing apparatus previously certified as complying with BS229 3) , BS1259 or BS4683 to comprise a single unit or system. NOTE 2For the purpose of this standard, apparatus that would otherwise be required to comply speci
24、fically with BS5501, BS229, etc., is described as, for example, “BS5501 type”, “BS4683-2 type”, etc. However, it is important to appreciate that the use of such descriptions is not intended to imply that the apparatus actually complies in all respects with the standard referred to although it may ha
25、ve been designed, constructed and certified in accordance with the standard referred to prior to being functionally connected. References to apparatus previously certified to BS1259 and any requirements specified in this standard for such apparatus are not intended to apply to circuits designed in a
26、ccordance with BS3101, or to earth fault monitoring circuits associated with motor control gear, unless otherwise stated. NOTE 3The titles of the publications referred to in this standard are listed on the inside back cover. 1) For the convenience of this standard the term “apparatus” is used throug
27、hout to include systems and components except where otherwise stated. 2) In BS1259 the expression “Class1” is used, but for the purposes of this standard “Class1” and “Group I” are regarded as synonymous. In BS229, Group I refers to the gas group but for the purposes of this standard apparatus for g
28、as Group I is regarded as Group I apparatus. 3) For the purposes of this standard existing apparatus certified to the current or any earlier edition of BS229 may be interconnected with BS5501 type (seenote2to1.1) apparatus.BS6709:1986 2 BSI 07-1999 Section 2. Flameproof interconnected apparatus 2.1
29、General Flameproof interconnected apparatus, comprising one or more BS5501-5type constituents interconnected by mechanical means with one or more BS229 type or BS4683-2 type constituents, shall comply with 2.2 to2.5. 2.2 Design and construction 2.2.1 The BS5501-5 type constituent(s) shall be designe
30、d and constructed in accordance with BS5501-5, except for those departures necessary to provide for the flameproof mechanical interconnection (see2.2.3). 2.2.2 The BS229 type or the BS4683-2 type constituent(s) shall be designed and constructed in accordance with BS229 or BS4683-2 respectively, exce
31、pt for those departures necessary to provide for the flameproof mechanical interconnection (see2.2.3). 2.2.3 The design, construction, fixing arrangements and fasteners comprising the flameproof mechanical interconnection(s) between the two constituents (see2.2.1 and2.2.2) of the apparatus shall com
32、ply with either of the standards to which the constituents have generally been designed and constructed. 2.3 Verification and tests 2.3.1 Each constituent (see2.2.1 or2.2.2) shall, prior to interconnection, be subjected to the requirements for verification and tests specified in the standard to whic
33、h it has been generally designed and constructed. For the purpose of verification and tests on the incomplete constituents, completion of the enclosure by either of the following means shall be permitted: a) connecting to it apparatus of the BS5501-5, BS229 or BS4683-2 type, as appropriate, with whi
34、ch it is intended to be interconnected in service; or b) fitting suitable covers or plugs, simulating the interconnections, that are not intended to be used in service but which enable the testing to be carried out. 2.3.2 The flameproof interconnected apparatus, when fully assembled, shall be verifi
35、ed and tested either: a) in accordance with whichever one of the following British Standards has been nominated by the manufacturer: BS229, BS4683-2, or BS5501-5; or b) in the absence of such nomination, in accordance with any one of the standards referred to in a). 2.4 Documentation The manufacture
36、r shall document how each constituent of the interconnected apparatus complies with the standard to which it has been generally designed and constructed and shall identify the constituents of the interconnected apparatus that are of the BS5501-5 type, those that are of the BS229 and/or BS4683-2 type
37、(s) and their interconnections. 2.5 Marking 2.5.1 The BS5501-5 type constituent(s) of the interconnected apparatus shall be marked, in a visible place, in accordance with2.5.2 and2.5.3. NOTEThe non-BS5501 type constituent(s) need not be marked in accordance with this standard. The marking in accorda
38、nce with2.5.2 shall be deemed to supersede any pre-existing marking. 2.5.2 The marking shall include the following: a) the name of the manufacturer or his registered trade mark; b) the manufacturers product type identification; c) the number of this British Standard, i.e.BS6709; d) the code Ex d l;
39、e) where a certificate has been obtained, the name or registered mark of the certifying authority and the certificate reference in the following form: the last two digits of the year of certification followed by the serial number of the certificate in that year. NOTE 1A reproduction of the registere
40、d flameproof mark may be added, if the manufacturer holds a licence to apply this mark (seeAppendix A). NOTE 2The sign X may be placed after the certification reference 2.5.2 e) if the certifying authority considers that it is necessary to indicate special conditions of use. 2.5.3 The marking shall
41、not invalidate the type(s) of protection and shall be legible and durable, taking into account possible chemical corrosion, in accordance withAppendix B.BS6709:1986 BSI 07-1999 3 Section 3. Interconnected apparatus with mixed types of protection excluding intrinsic safety 3.1 General Interconnected
42、apparatus with mixed types of protection, excluding intrinsic safety, comprising either a) one or more BS5501-2, BS5501-3, BS5501-4, BS5501-5 or BS5501-6 type constituents interconnected by mechanical means with one or more BS4683-4 type constituents, or b) one or more BS5501-2, BS5501-3, BS5501-4 o
43、r BS5501-6 type constituents interconnected by mechanical means with one or more BS229 or BS4683-2 type constituents shall comply with 3.2 to 3.5. NOTEThe interconnection of BS5501-6 type constituents to BS4683-4 type constituents, although not strictly a “mixed” type of protection, is included in t
44、his section. 3.2 Design and construction 3.2.1 The BS5501 type constituent(s) shall be designed and constructed in accordance with BS5501-2, BS5501-3, BS5501-4, BS5501-5 or BS5501-6 as appropriate, except for those departures necessary to provide for the interconnection (see3.2.3). 3.2.2 The BS229 t
45、ype or the BS4683 type constituent(s) shall be designed and constructed in accordance with BS229, BS4683-2 or BS4683-4 as appropriate, except for those departures necessary to provide for the interconnection (see3.2.3). 3.2.3 The design, construction, fixing arrangements and fasteners comprising the
46、 mechanical interconnection(s) between the two constituents (see3.2.1 and3.2.2) of the apparatus shall comply with the relevant requirements of each of the standards to which the two constituents have generally been designed and constructed (seeAppendix C). 3.3 Verification and tests 3.3.1 Each cons
47、tituent (see3.2.1 or3.2.2) shall, prior to interconnection, be subjected to the requirements for verification and tests specified in the standard to which it has generally been designed and constructed. For the purpose of verification and tests on the incomplete constituents, completion of the enclo
48、sure by either of the following means shall be permitted: a) connecting to it apparatus of the BS5501, BS229 or BS4683 type, as appropriate, with which it is intended to be interconnected in service; or b) fitting suitable covers or plugs, simulating the interconnections, that are not intended to be
49、 used in service but which enable the testing to be carried out. 3.3.2 The interconnected apparatus, when fully assembled, shall be verified and tested either: a) in accordance with whichever British Standard has been nominated, from those given in3.1, by the manufacturer for each constituent; or b) in accordance with both of the British Standards nominated, from those given in3.1, by the manufacturer for the constituents each side of the interconnection. 3.4 Documentation The manufacturer shall document how each constituent of the interconnected apparatus complies with the
