1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7924:1999 ICS 29.260.2
2、0 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Code of practice for The repair and overhaul of certified electrical apparatus intended for use in mines susceptible to firedampThis British Standard, having been prepared under the direction of the Engineering Sector Committee
3、, was published under the authority of the Standards Committee and comes into effect on 15 November 1999 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference MRE/3/2 Draft for comment 96/715959 DC ISBN 0 580 33053 2 BS 7924:1999 Amendments issued since pu
4、blication Amd. No. Date Comments Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee MRE/3, Mining electrical equipment, to Subcommittee MRE/3/2, Transformers and supply control units, upon which the following bodies were rep
5、resented: Association of British Mining Equipment Companies Health and Safety Executive Transmission and Distribution Association (BEAMA Ltd.) The following bodies were also represented in the drafting of the standard, through a panel: Association of Electrical Machinery Trades Confederation of Unit
6、ed Kingdom Coal Producers Institution of Electrical Engineers Rotating Electrical Machines Association (BEAMA Ltd.) Co-opted membersBS 7924:1999 BSI 11-1999 i Contents Page Committees responsible Inside front cover Foreword ii 0 Introduction 1 1 Scope 2 2 Normative references 3 3 Terms and definitio
7、ns 3 4 General 4 5 Statutory requirements 4 6 Responsibilities of the manufacturer 4 7 Responsibilities of the user 4 8 Responsibilities of the repairer 4 9 Identification of repaired and overhauled apparatus 6 10 Reclamation 6 11 Removal of damaged windings 7 12 Encapsulated parts 7 13 Light-transm
8、itting parts 7 14 Temporary repairs 7 15 Cleaning agents and finishes 7 16 Repair of flameproof apparatus (type “d”) 8 17 Repair of intrinsically safe (IS) apparatus (type “i”) 11 18 Repair of increased safety apparatus (type “e”) 13 Annex A (informative) Statutory duties 15 Bibliography 16 Figure 1
9、 Symbols indicating status of repair/overhaul 6 Table 1 Resistance of insulation on windings 9ii BSI 11-1999 BS 7924:1999 Foreword This British Standard has been prepared by Subcommittee MRE/3/2. Attention is drawn to the Health and Safety at Work etc. Act 1974, the Mines and Quarries Act 1954 and t
10、he Regulations made under these Acts, and also to any other appropriate statutory requirements or bylaws. These place responsibility for complying with certain specific requirements on the manufacturer, user and persons performing overhaul or repair of apparatus, to ensure that it is safe for use an
11、d that any relevant information relating to its safe use is available to the user. Three certification test houses are currently recognized by the Secretary of State for Employment under the Electrical Equipment For Explosive Atmospheres (Certification) Regulations 1990. Their addresses are as follo
12、ws: 1. The Electrical Equipment Certification Service (EECS) Mining Equipment Certification Service (MECS) Harpur Hill BUXTON SK17 9JN 2. SIRA Test pressurized “p”; powder filling “q”; and encapsulation “m”. NOTE 3 Apparatus which contains oil is installed in British mines, but such equipment should
13、 be repaired in accordance with this standard and that to which it was certified. BSI 11-1999 3 BS 7924:1999 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this British Standard. For dated references, subseq
14、uent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred to applies. BS 229:1957, Specification. Flameproof enclosure of electrical apparatus. BS 1259:1958, Intrinsically safe electrical apparatus and circuits
15、 for use in explosive atmospheres. BS 4683-2:1971, Specification for electrical apparatus for explosive atmospheres Part 2: The construction and testing of flameproof enclosures of electrical apparatus. BS 4683-4:1973, Specification for electrical apparatus for explosive atmospheres Part 4: Type of
16、protection “e”. BS 5501-5:1977, Electrical apparatus for potentially explosive atmospheres Part 5: Flameproof enclosure “d”. BS 5501-6:1977, Electrical apparatus for potentially explosive atmospheres Part 6: Increased safety “e”. BS 5501-7:1977, Electrical apparatus for potentially explosive atmosph
17、eres Part 7: Intrinsic safety “i”. BS EN 50014:1998, Electrical apparatus for potentially explosive atmospheres General requirements. BS EN 50018:1995, Electrical apparatus for potentially explosive atmospheres Flameproof enclosures “d”. BS EN 50019:1994, Electrical apparatus for potentially explosi
18、ve atmospheres Increased safety “e”. BS EN 50020:1995, Electrical apparatus for potentially explosive atmospheres Intrinsic safety “i”. 3 Terms and definitions For the purposes of this British Standard, the following terms and definitions apply. 3.1 flameproof apparatus (type “d”) apparatus conformi
19、ng to BS 229:1957, BS 4683-2:1971, BS 5501-5:1977 (EN 50018:1977) and/or BS EN 50018:1995 3.2 intrinsically safe (IS) apparatus (type “i”) apparatus conforming to BS 1259:1958, BS 5501-7:1977 (EN 50020:1977) and/or BS EN 50020:1995 3.3 increased safety apparatus (type “e”) apparatus conforming to BS
20、 4683-4:1973, BS 5501-6:1977 (EN 50019:1977) and/or BS EN 50019:1994 3.4 serviceable condition state of the apparatus such that it is fit for use and is in accordance with the explosion protection concept standard to which the apparatus was originally certified 3.5 overhaul action intended to restor
21、e apparatus to its serviceable condition, where inspection has established that the apparatus is neither faulty nor damaged, which does not involve the replacement of any part that can affect the explosion protection 3.6 repair action intended to restore apparatus to its serviceable condition, where
22、 inspection has established that the apparatus is either faulty or damaged, which involves the replacement or reclamation of a part that can affect the explosion protection 3.7 repairer person or organization performing repair or overhaul NOTE A repairer can be the manufacturer, the user or a third
23、party (e.g. a repair agency). 3.8 manufacturer maker of the apparatus in whose name any certification of the apparatus was originally registered NOTE The manufacturer can also be the supplier, the importer or the agent. 3.9 reclamation means of repair involving the removal or addition of material an
24、d/or the replacement of components not supplied by the manufacturer as user-replaceable parts, which affects the explosion protection afforded to the apparatus NOTE The term “recovery” is sometimes used as a synonym for “reclamation”. 3.10 certification issuing of a document by a notified body testifying that a type of apparatus or a type of component conforms to a published national or international standard
