1、Erection of electrical installationsin underground minesBS EN 50628:2016BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK implementation of EN 50628:2016. The UK participation in its preparation was entrusted to Technica
2、lCommittee EXL/31, Equipment for explosive atmospheres.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The Briti
3、sh Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 88683 6ICS 29.260.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 July 201
4、6. Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 50628:2016EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50628 July 2016 ICS 29.260.20 English Version Erection of electrical installations in underground mines Construction des installations lectriques da
5、ns les mines souterraines Errichten elektrischer Anlagen im Bergbau unter Tage This European Standard was approved by CENELEC on 2016-05-23. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a
6、national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German
7、). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium,
8、Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swi
9、tzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CENELEC All rights of exploitation i
10、n any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50628:2016 E BS EN 50628:2016EN 50628:2016 2 Contents Page European foreword 5 Introduction 6 1 Scope . 7 2 Normative references . 8 3 Terms and definitions 9 4 General . 21 4.1 General requirements . 21 4.2 Initial insp
11、ections 22 4.3 Competence of personnel 22 4.4 Documentation 22 5 Means of protection against electric- and electrostatic charging . 23 6 Rooms and Locations 23 6.1 Electrical service rooms 23 6.2 Closed electrical service rooms 23 6.3 Other rooms 23 7 Protection against fire spreading 24 7.1 General
12、 requirements . 24 8 Insulation, Insulation-resistance and its check . 24 8.1 Insulation . 24 8.2 Value of insulation resistance . 25 8.3 Insulation resistance check . 25 9 Signboards, labels, wiring diagrams, inscriptions 26 9.1 General requirements . 26 10 Nominal voltages 26 10.1 General requirem
13、ents . 26 10.2 Voltage ranges 27 11 Protection against electrical shock 27 11.1 Requirements for basic protection . 27 11.1.1 Protection by basic insulation of live parts . 27 11.1.2 Protection by barriers or enclosures 27 11.1.3 Protection by obstacles and placing out of reach 28 11.2 Requirements
14、for fault protection . 28 12 Protection in IT-Systems 28 12.1 General . 28 12.2 Earth fault detection in IT-systems . 29 12.3 Design of IT system 29 12.4 Insulation monitoring . 30 12.5 Protective conductor 31 12.6 Electrical protection devices in IT-systems . 33 12.7 Design of cables being monitore
15、d by a protection device . 36 13 Protection in TN-systems 37 BS EN 50628:2016EN 50628:2016 3 13.1 TN-S- systems with residual current devices (RCD) . 37 13.2 TN-S System without residual current devices (RCD) . 38 14 Other means of protection . 38 15 Protection against danger caused by mechanical in
16、fluence on non-intrinsically safe cables 38 15.1 General requirements . 38 15.2 Cables to supply mobile electrical equipment . 39 15.3 Cable in areas of mining activities or road heading areas till 50 m far from the road heading face . 40 16 Intrinsically safe electrical systems 40 16.1 General requ
17、irements for selection . 40 16.2 Descriptive system document . 40 16.3 Erection 40 16.4 Separation of intrinsically and non-intrinsically safe circuits 41 16.5 Separation of different intrinsically safe circuits . 42 16.6 Earthing 42 16.7 Cable for intrinsically safe systems 42 17 Installation of tr
18、ansformers 42 18 Substations 42 19 Disconnecting devices in line of each switch-gears . 43 20 Switchgears . 43 21 Couplers and connectors . 43 21.1 General requirements for use of couplers and connectors 43 21.2 Additional requirements using couplers 43 22 Luminaries and lighting installation 44 23
19、Cables . 44 23.1 Design of cables 44 23.2 Conductor materials 45 23.3 Current carrying capacity . 45 23.4 Coverings and outer protective covers. 45 23.5 Different circuits within one cable . 46 23.6 Laying out of cables 46 23.7 Glanding, terminating or making off . 47 23.8 Laying out of non-insulate
20、d conductors . 48 23.9 Additional requirements for the use of single core cable . 49 24 Protection of electrical equipment or installation against overcurrent . 49 24.1 Overcurrent protection devices . 49 24.2 Overload protection 50 24.3 Short circuit protection . 50 24.4 Minimum short circuit curre
21、nt . 51 25 Calculation of short circuit currents . 52 26 Additional requirements for systems and equipment with nominal voltage of more than 1 kV up to 6,6 kV in production areas and road heading 52 26.1 General requirements . 52 26.2 Switchgears . 52 26.3 Test of insulation resistance of non-alive
22、cable in production areas and road headings 52 26.4 Insulation monitoring of alive systems . 53 26.5 Earth protection in IT systems . 53 26.6 Monitoring of non-alive systems . 53 26.7 Electrical protection devices for feeding cables of electrical equipment . 54 BS EN 50628:2016EN 50628:2016 4 26.8 C
23、able design 54 27 Additional requirements for cable entry selection 54 Annex A (informative) Documentation . 55 Annex B (normative) Tables and figures regarding free space . 56 Annex C (informative) Example for a galvanically separated system (in production areas or road headings) . 58 Annex D (info
24、rmative) Example for calculation (according to 12.3.6) . 61 D.1 General . 61 D.2 Legend . 61 D.3 Necessary system parameters 61 D.4 Determination of the reference points of the system . 61 D.5 Calculation of the capacitive earth fault current and displaying in a figure (see Figure D.2) 62 D.6 Overla
25、y of capacitive and inductive earth fault current IeL IeC= IeB.62 D.7 Calculation of the voltage drop caused by the wattles component of the earth fault current 63 D.8 Calculation of the voltage drop caused by the active component of the earth fault current . 64 D.9 Resulting voltage drop UFby geome
26、trical addition 64 Annex E (informative) Table for cables suitable for underground workings . 66 Annex F (informative) Table for current carrying capacity of cables suitable for underground workings 73 Bibliography . 76 BS EN 50628:2016EN 50628:2016 5 European foreword This document (EN 50628:2016)
27、has been prepared by CLC/TC 31 “Electrical apparatus for potentially explosive atmospheres”. The following dates are fixed: latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2017-05-23 latest date by wh
28、ich the national standards conflicting with this document have to be withdrawn (dow) 2020-05-23 This document will be read in conjunction with the European Standards for the specific types of protection listed in the EN 60079 series of standards. This document will also be read in conjunction with E
29、N 1127-2. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all such patent rights. BS EN 50628:2016EN 50628:2016 6 Introduction When electrical equipment is to
30、 be installed in underground workings where an explosive atmosphere is likely to occur, protective measures are applied to avoid the ignition of firedamp either under normal operation of the electrical installation or under fault conditions. Mines can be either gassy or non-gassy depending upon the
31、mineral/material being extracted and whether or not firedamp can occur in the workings. It is usual practice to consider all coal mines as gassy mines. Non-coal mines can however, also be susceptible to the occurrence of firedamp e.g. if they are mining minerals/materials in the vicinity of oil bear
32、ing strata or unworked coal seams which are to be disturbed by the mining process, or are susceptible to outbursts of flammable gas. Due to the fact that in underground workings firedamp is one of the major mining hazards that is to be considered all pieces of electrical equipment need to be selecte
33、d with regard to this hazard. If there are other significant explosive atmospheres than firedamp the hazard occurring from these explosive atmospheres needs to be taken into account. Directive 2014/34/EU extends the definition of potentially explosive atmosphere to include combustible dust as well a
34、s firedamp. Extensive research1)has shown that the minimum ignition energy (MIE) of coal dust/ air mixture is several hundred times higher than that of a firedamp/ air mixture and that the maximum experimental safe gap (MESG) for coal dust particles is more than double that for firedamp. It is there
35、fore reasonable to assume that equipment, protective systems and components that are designed, constructed and maintained for use in firedamp/ air mixtures are also suitable for use in coal dust/ air mixtures. Unlike Group II it will be assumed that in Group I industry nearly all underground working
36、s need to be assessed where an explosive atmosphere is likely to occur and classified accordingly as hazardous areas. A zone classification for such underground workings is not possible because the degree of exposure of such an underground working does not depend on local parameters but on time para
37、meters. In accordance with 2014/34/EU (ATEX-Directive) the exposure of the installed equipment may change from normally acceptable firedamp concentration in the mine air (hazardous condition 2; M2 equipment sufficient) to elevated methane concentration (hazardous condition 1; M1 equipment required,
38、M2 equipment to be de-energized) and vice versa. Areas of a coal mine could be non-hazardous according to national regulations. In such areas equipment that is not ATEX approved may be used, too subject to the risk assessment and specific local rules where national regulations require. In non-gassy
39、mines it can be possible that in certain regions in the underground workings explosive atmospheres can occur. In these cases national regulations will apply. In mines where the atmosphere, in addition to firedamp, may contain significant proportions of other flammable gases than firedamp, the instal
40、led Group I equipment complies also with the subdivision of Group II corresponding to the other significant flammable gases. In any underground working, irrespective of the size, there may be numerous sources of ignition apart from those associated with electrical equipment. Precautions will be nece
41、ssary to ensure safety from other possible ignition sources, but guidance on this aspect is outside the scope of this standard. Underground mining activities cause other special problems to the electrical installation as well as those arising from firedamp. Rough environmental conditions evoked by c
42、limate temperature and humidity e.g. rock pressure caused by depth, geometric dimensions of the underground workings, the winning process itself and other similar circumstances require therefore special specifications to the electrical installation in underground mines. 1) Survey on the use of flame
43、proof enclosures in coal dust and methane atmospheres, G. A. Lunn, SM/97/01. BS EN 50628:2016EN 50628:2016 7 1 Scope This European Standard specifies the safety requirements for the erection of new electrical installations. This European Standard is supplementary to other relevant harmonized standar
44、ds, for example HD 60364 series and the EN 61936 series as regards electrical installation requirements. This European Standard also refers to EN 60079-0 and its associated standards for the construction, testing and marking requirements of suitable electrical equipment. EN 60079-14 gives the specif
45、ic requirements for design, selection and erection of electrical installations in explosive atmospheres. NOTE EN 6007914 can apply to electrical installations in mines where explosive gas atmospheres other than firedamp can be formed and to electrical installations in the surface installation of min
46、es. This European Standard applies to: a) electrical installation in underground workings of mines; b) electrical installations and parts of electrical installation above ground, which are directly connected with the underground workings in functional and safety relating matters because of being par
47、t of the underground working process: These are in particular: safety and monitoring devices relating to the power distribution of the underground workings, communication system of hoisting and inclined haulage plants, intrinsically safe electrical installations of above ground installation being pa
48、rt of underground workings, remote control systems if they shall fulfil increased requirements relating to functional safety, electrical installation and electrical equipment of ventilation systems and shaft casings above ground being endangered by firedamp of the underground ventilation, firedamp d
49、rainage systems; c) electrical installation in underground workings outside mining if it is demanded of the competent national authorities. National regulations of the mining authority shall remain unaffected. This standard applies to installations at all voltages mentioned in Clause 10. Requirements above both columns are requirements for all underground workings. Gassy mines Requirements within left column are requirements for underground workings in the coal mining industry which could be endangered by firedamp. Other mines Requirements within
