BS EN 60079-14:2014 – TC:2019 Edition
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Tracked Changes. Explosive atmospheres – Electrical installations design, selection and erection
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 321 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 3 | BS EN 60079-14:2014 to BS EN 60079-14:2008 |
| 17 | BS EN 60079-14:20082014 BRITISH STANDARD |
| 18 | Atmosphères explosives – Central Secretariat: rue de Stassart 35CEN-CENELEC Management Centre: Avenue Marnix 17, B – 10500 Brussels |
| 19 | Foreword |
| 21 | Endorsement notice |
| 23 | Annex ZA (normative) |
| 27 | BS EN 60079-14:2008 – 6 – EN 60079-14:2008 (E) Annex ZB (informative) |
| 28 | CONTENTS |
| 38 | INTRODUCTION |
| 41 | EXPLOSIVE ATMOSPHERES – 1 Scope |
| 42 | 2 Normative references |
| 45 | 3 Terms and definitions 3.1 General 3.1.2 3.1.3 3.2 Hazardous areas 3.2.2 3.2.3 3.2.4 3.2.45 |
| 46 | 3.2.56 3.2.67 3.2.78 3.2.89 3.2.910 3.2.1011 3.2.1112 3.3 Flameproof enclosure 3.3.1 3.3.2 3.4 Increased safety 3.4.1 |
| 47 | 3.4.2 3.4.3 3.4.4 3.5 Intrinsic safety – General 3.5.1 3.5.2 3.5.23 3.5.34 3.5.45 |
| 48 | 3.5.56 3.5.67 3.5.78 intrinsically safe sub-circuit 3.6 Intrinsic safety parameters 3.6.1 3.7 Pressurization 3.7.1 3.7.2 3.7.3 3.7.4 |
| 49 | 3.8 Type of protection “n” 3.8.1 3.8.2 3.8.3 associated energy-limited apparatus 3.9 oil-immersion “o” 3.10 powder filling “q” 3.11 encapsulation “m” 3.12 dust ignition protection type ‘tD’by enclosure “t” 3.13 Electrical supply systems 3.13.1 |
| 50 | 3.13.2 3.14 Equipment 3.14.2 3.14.3 3.14.4 3.15 radio frequency identification RFID 4 General 4.1 General requirements |
| 51 | 4.2 Documentation |
| 52 | 4.3 Initial inspection |
| 53 | 4.34 Assurance of conformity of equipment 4.34.1 Equipment with certificates according to IEC standards 4.4.1.2 IEC standards 4.34.4.2 Equipment without certificates according to IEC standards 4.34.3 Selection of repaired, second hand or existing equipment |
| 54 | 4.45 Qualifications of personnel 5 Selection of equipment (excluding cables and conduits) 5.1 Information requirements 5.2 Zones 5.3 Relationship between Eequipment protection levels (EPLs) and zones Table 1 – Equipment protection levels (EPLs) where only zones are assigned |
| 55 | 5.4 Selection of equipment according to EPLs 5.4.1 General 5.4.12 Relationship between EPLs and types of protection Table 2 – RelationshipDefault relationship between types of protection and EPLs |
| 56 | 5.4.23 Equipment for use in locations requiring EPL “Ga” or “Da” 5.4.34 Equipment for use in locations requiring EPL “Gb” or “Db” 5.4.45 Equipment for use in locations requiring EPL “Gc” or “Dc” |
| 57 | 5.5 Selection according to equipment grouping Table 3 – Relationship between gas/vapour or dust subdivision and equipment group 5.6 Selection according to the ignition temperature of the gas, vapour or dust and ambient temperature 5.6.1 General 5.6.2 Gas or vapour Table 4 – Relationship between gas or vapour |
| 58 | 5.6.3 Dust 5.6.3.12 Temperature limitations because of the presence of dust clouds 5.6.3.23 Temperature limitation because of presence of dust layers |
| 59 | Figure 1 – Correlation between the maximum permissible surface temperature and depth of dust layers 5.6.3.2.2 Enclosures for practice B only apparatus for dust layers up to 12,5 mm thickness 5.6.3.34 Unavoidable dust layers |
| 60 | 5.6.3.4 Maximum permissible surface temperature 5.7 Selection of radiating equipment for dust 5.7.1 General 5.7.12 Ignition process |
| 61 | 5.7.2 Safety measures in zone 20 or 21 5.7.3 Safety measures in zone 22 5.8 Selection of ultrasonic equipment for dust 5.8.1 General 5.8.12 Ignition process 5.8.2 Safety measures 5.8.2.1 Safety measures in zone 20 or 21 |
| 62 | 5.8.2.2 Safety measures in zone 22 5.9 External Selection to cover external influences |
| 63 | 5.1110 Selection of transportableTransportable, portable and personal equipment 5.1110.1 General |
| 64 | 5.1110.2 Transportable and portable equipment-Gas 5.1110.3 Personal Equipment-Gasequipment 5.11.4 Dust 5.1211 Selection of rotating Rotating electrical machines 5.12.1 General Rotating electrical machines are classified in accordance with IEC 60034-1 for duty cycles S1 to S10. 5.1211.1 General |
| 65 | 5.11.2 Environmental Factors for “Ex” machine installation 5.11.3 Power and accessory connections, grounding |
| 66 | 5.12.211.4 Motors fed from a converter supply 5.11.5 Switching motors above 1kV 5.11.5.2 Overvoltages resulting from switching operations |
| 67 | 5.1312 Luminaires 5.1413 Plugs and socket outlets for dust 5.13.1 General 5.14.1 General 5.14.13.2 MountingSpecific requirements for explosive dust atmospheres 5.1413.3 Location 5.14 Cells and batteries 5.14.1 Charging of secondary cells and batteries |
| 68 | 5.14.2 Ventilation 5.15 RFID tags 5.15.1 General 5.15.2 Passive RFID tags 5.15.3 Mounting RFID tags 5.16 Gas detection equipment |
| 69 | 6 Protection from dangerous (incendive) sparking 5.106.1 Light metals as construction materials 5.10.1 Gas or vapour 5.10.2 Dust 6.12 Danger from live parts 6.23 Danger from exposed and extraneous conductive parts 6.3.1 General |
| 70 | 6.3.2.1 TN type of system earthing 6.2.23.3 TT type of system earthing 6.2.3.4 IT type of system earthing 6.2.43.5 SELV and PELV systems 6.2.53.6 Electrical separation 6.2.6.3.7 Above Non Ex electrical equipment above hazardous areas |
| 71 | 6.34 Potential equalization 6.34.1 General |
| 72 | 6.34.2 Temporary bonding 6.3.2.1 Gas 6.3.2.2 Dust 6.45 Static electricity 6.4.1 Gas The risk of incendive sparking from non-metallic installation materials (e.g. plastic covered cable trays, plastic mounting plates, plastic weather protection) shall be controlled by: 6.5.1 General |
| 73 | 6.5.2 Avoidance of a build-up of electrostatic charge on construction and protecting parts for locations requiring EPL “Ga”, “Gb” and “Gc” Table 5 – Limitation of surface areas |
| 74 | 6.4.25.3 Dust Avoidance of a build-up of electrostatic charge on construction and protecting parts for locations requiring EPL “Da”, “Db” and “Dc” |
| 75 | 6.56 Lightning protection 6.67 Electromagnetic radiation 6.7.1 General 6.7.2 Radio frequency received in hazardous areas Table 8 – Radio frequency power thresholds Table 9 – Radio-frequency energy thresholds |
| 76 | 6.78 Cathodically protected metallic parts 6.89 Ignition by optical radiation 7 Electrical protection 7.1 General 7.3 Transformers |
| 77 | 8 Emergency switchSwitch-off and electrical isolation 8.1 General 8.12 Emergency switchSwitch-off 8.23 Electrical isolation 9 WiringCables and wiring systems 9.1 General 9.2 Aluminium conductors |
| 78 | 9.3 Cables 9.3.1 General 9.3.12 Cables for fixed wiringinstallations 9.3.43 Flexible cables for fixed installations (excluding intrinsically safe circuits) |
| 79 | 9.3.3 Flexible connections for dust 9.3.24 CablesFlexible cables supplying transportable and portable equipment (excluding intrinsically safe circuits) 9.3.5 Non-sheathed single coresSingle insulated wires (excluding intrinsically safe circuits) 9.3.6 Overhead lines 9.3.7 Avoidance of damage |
| 80 | 9.3.8 Cable surface temperature 9.3.9 FlameResistance to flame propagation 9.4 Conduit systems |
| 81 | In addition, national or other standards should be followed for conduit systems. 9.5 Cable and conduit systemsAdditional requirements 9.5.1 EPL ‘Ga’ 9.5.2 EPL ‘Da’ 9.5.3 Cable and conduit systems for EPL ‘Gb’, ‘Gc’, ‘Db’ and ‘´Dc’ |
| 82 | 9.6 Installation requirements 9.6.1 Circuits traversing a hazardous area 9.6.2 Protection of stranded endsTerminations 9.6.3 Unused cores 9.6.4 Unused openings 9.6.5 Fortuitous contact 9.6.6 Jointing |
| 83 | 9.6.74 Openings in walls 9.6.85 Passage and collection of flammables 9.6.9 Static build-up for dust 9.6.106 Accumulation of combustible dust 10 Cable entry systems and blanking elements 9.3.10 Connections of cables to equipment 10.1 General 10.2 Selection of cable glands |
| 84 | Table 10 − Selection of glands, adapters and blanking elements type of protection according to the enclosure type of protection 10.3 Connections of cables to equipment |
| 85 | 10.4 Additional requirements for entries other than Ex “d”, Ex “t” or Ex “nR” 10.5 Unused openings 10.6 Additional requirements for type of protection “d” – Flameproof enclosures 10.6.1 General |
| 86 | 10.6.2 Selection of cable glands 10.7 Additional requirements for type of protection “t” – Protection by enclosure |
| 87 | Table 11 – Level of protection, equipment group and ingress protection relationship 14.3.2.210.8 Cable glands for ‘nR’ equipmentAdditional requirements for type of protection “nR” – Restricted breathing enclosure 7.211 Rotating electrical machines 11.1 General 10.611.2 Motors with type of protection “d” – Flameproof enclosures 10.6.111.2.1 Motors with a converter supply |
| 88 | 10.6.211.2.2 Reduced-voltage starting (soft starting) 11.3 Cage induction motorsMotors with type of protection “e” – Increased safety 11.3.1 Mains-operated |
| 89 | 11.3.2 Winding temperature sensors 11.3.3 Machines with rated voltage greater than 1 kV |
| 90 | 11.3.4 Motors with converter supply 11.3.5 Reduced-voltage starting (soft starting) 13.211.4 Motors with type of protection “p” and “pD” – Pressurized enclosures 13.2.111.4.1 Motors with a converter supply 13.2.211.4.2 Reduced-voltage starting (soft starting) |
| 91 | 11.5 Motors with type of protection “t” – Protection by enclosures supplied at varying frequency and voltage 11.5.1 Motors with a converter supply 11.5.2 Reduced-voltage starting (soft starting) 14.411.6 Motors with type of protection “nA” – Non-sparking 14.4.211.6.1 Motors with converter supply |
| 92 | 14.4.311.6.2 Reduced-voltage starting (soft starting) 14.4.111.6.3 Machines with rated voltage greater than 1 kV 11.412 Luminaires 7.413 Resistance Electric heating devicessystems 13.1 General |
| 93 | 13.2 Temperature monitoring Table 12 – Requirements for the temperature monitoring systems 13.3 Limiting temperature |
| 94 | 13.4 Safety device |
| 95 | 13.5 Electrical trace heating systems 1014 Additional requirements for type of protection “d” – Flameproof enclosures 1014.1 General 1014.2 Solid obstacles Untitled |
| 96 | Table 613 – Minimum distance of obstruction from the flameproof flange joints related to the gas group of the hazardous area 1014.3 Protection of flameproof joints |
| 97 | 10.4 Cable entry systems 10.4.1 General 10.4.2 Selection of cable glands |
| 98 | 10.514.4 Conduit systems 11.1 Degree of ingress protection of enclosures (IEC 60034-5 and IEC 60529) 11.2 Wiring systems 11.2.1 General |
| 99 | 11.2.2 Cable glands 11.2.3 Conductor terminations 15.1 General Only Ex “e” equipment having a complete certificate shall be installed. 11.2.4 Combinations of terminals and conductors for general connection and junction boxes 15.2 Maximum dissipated power of terminal box enclosures |
| 100 | 15.3 Conductor terminations 15.4 Maximum number of conductors in relation to the cross-section and the permissible continuous current |
| 101 | Table 14 – Example of defined terminal/conductor arrangement – Maximum number of wires in relation to the cross-section and the permissible continuous current |
| 102 | 1216.1 Introductory remarkGeneral 1216.2 Installations to meet the requirements of EPL “Gb” or “Gc” and “Db” or “Dc” 1216.2.1 Equipment |
| 103 | 126.2.2 Cables 1216.2.2.2 Electrical parameters of cables 1216.2.2.3 Earthing of conducting screens |
| 104 | Figure 32 – Earthing of conducting screens |
| 105 | 1216.2.2.5 Installation of cables and wiring 1216.2.2.5.2 Conductors 1216.2.2.5.3 Unused cores in multi-core cables 1216.2.2.6 Marking of cables |
| 106 | 1216.2.2.7 Multi-core cables containingCables carrying more than one intrinsically safe circuit 1216.2.2.8 FaultTypes of cables carrying more than one intrinsically safe circuit and applicable fault considerations in multi-core cables |
| 107 | 12.2.3 Termination of intrinsically safe circuits NOTE Where a connector carries earthed circuits and the type of protection depends on the earth connection, then the connector should be constructed in accordance with the requirements given in IEC 60079-11 relating to earth conductors, connections an… 12.2.416.2.3 Earthing of intrinsically safe circuits |
| 108 | 1216.2.54 Verification of intrinsically safe circuits |
| 109 | NOTE A possible format for descriptive systems drawings and installation drawings can be found in IEC 60079- 25. Where a circuit contains significant amounts of energy stored in both capacitance and inductance the capacitive stored energy may reinforce the effect of the power source feeding the inductor. The distributed inductance and capacitance of cables is kn… |
| 110 | In addition, components with a surface area smaller than 1 000 mm2 (excluding lead wires) may be classified as T5 if their surface temperature does not exceed 150 C. NOTE 2 All connected apparatus includes any simple apparatus which may not have values for Li and Ci listed by the manufacturer. The source of power could be associated apparatus or other intrinsically safe apparatus. Table 7 – Assessment for T4 classification according to component size and ambient temperature Guidance on the determination of cable parameters is given in 16.2.2.2. 16.2.4.4 Intrinsically safe circuits with more than one associated apparatus |
| 111 | 1216.3 Installations to meet the requirements of EPL “Ga” or “Da” |
| 112 | 16.4 Simple apparatus |
| 113 | Table 15 – Variation in maximum power dissipation with ambient temperature for Equipment Group II 16.5 Terminal boxes 16.5.1 General 16.5.2 Terminal boxes with only one intrinsically safe circuit |
| 114 | 16.5.3 Terminal boxes with more than one intrinsically safe circuit 16.5.4 Terminal boxes with non-intrinsically safe and intrinsically safe circuits 16.5.5 Plugs and sockets used for external connections |
| 115 | 12.416.6 Special applications 137 Additional requirements for pressurized enclosures 17.1 General 13.117.2 Type of protection “p” 13.117.2.1 General Table 816 – Determination of type of protection (with no flammable release within the enclosure) 13.117.2.2 Ducting |
| 116 | Table 917 – Use of spark and particle barriers 13.117.2.3 Action to be taken on failure of pressurization |
| 117 | 13.117.2.3.2 Equipment without an internal source of release Table 1018 – Action to be taken when the pressurization with the protective gas fails Summary of protection requirements for electrical equipmentenclosures without an internal source of release 17.2.3.2.2 Automatic switch-off 17.2.3.2.3 Alarm |
| 118 | 13.117.2.3.3 Equipment with an internal source of release 13.117.2.4 Multiple pressurized enclosures with a common safety device |
| 119 | 13.117.2.5 Purging 13.117.2.6 Protective gas 1317.3 Type of protection “pD” 1317.3.1 Sources of protective gas |
| 120 | Table 1119 – Summary of protection requirements for enclosures 1317.3.2 Automatic switch-off 1317.3.3 Alarm 1317.3.4 Common source of protective gas 137.3.5 Switching on electrical supply |
| 121 | 13.3.6 Motors with a converter supply 1317.4 Rooms for explosive gas atmosphere 13.4.1 Pressurized rooms and analyser houses 13.4.1.17.4.2 Analyser houses |
| 122 | 1418 Additional requirements for type of protection “n” 1418.1 General 18.2 “nR” equipment 18.3 Combinations of terminals and conductors for general connection and junction boxes |
| 123 | 14.2 Degree of ingress protection of enclosures (IEC 60034-5 and IEC 60529) 14.3 Wiring systems 14.3.1 General 14.3.2 Cable glands |
| 124 | 14.3.318.4 Conductor terminations 1519 Additional requirements for type of protection “o”– Oil immersion 19.1 General 19.2External connections 1620 Additional requirements for type of protection “q” – Powder filling |
| 125 | 1721 Additional requirements for type of protection “m” – Encapsulation 22 Additional requirements for type of protection“op” – Optical radiation 1823 Additional requirements for type of protection ‘tD’“t” – Protection by enclosure 18.1 Practices A and B 18.2 Practice A Table 12 – Dust tightness practice A 18.3 Practice B |
| 126 | Table 13 – Dust tightness practice B 18.4 Motors supplied at varying frequency and voltages |
| 127 | Annex FA (normative) FA.1 Scope FA.2 Knowledge and skills FA.2.1 Responsible persons FA.2.2 Operatives/technicians (selection and erection) FA.2.3 Designers (design and selection) |
| 128 | FA.3 Competencies FA.3.1 General FA.3.2 Responsible persons FA.3.3 Operatives/technicians FA.3.4 Designers FA.4 Assessment |
| 129 | Annex DB (informative) |
| 130 | Annex C (normative) Table C.1 – Inspection schedule for Ex “d”, Ex “e”, Ex “n” and Ex “t” |
| 132 | Table C.2 – Initial inspection schedule for Ex “I” installations |
| 135 | D.1 General D.2 Cables D.3 Electrical trace heating systems D.4 Lighting systems D.4.1 General D.4.2 Emergency lights D.5 Electrical rotating machines |
| 136 | Annex E (informative) E.1 Test procedure |
| 137 | Annex F (informative) F.1 General F.2 Definitions F.2.1 Electrical trace heating system F.2.2 System components F.2.3 Site-fabricated trace heaters |
| 138 | F.2.4 Location of sensors F.2.5 Thermal insulation F.2.6 Personnel aspects F.3 General requirements |
| 139 | F.4 Requirements for EPL “Gb”, “Gc”, “Db” and “Dc” F.4.1 General F.4.2 Stabilized design F.4.2.2 PTC characteristic F.4.2.3 Fixed condition F.4.3 Controlled design |
| 140 | F.5 Design information F.5.1 Design information drawings and documents F.5.2 Isometric or heater configuration line lists and load charts |
| 141 | F.6 Incoming inspections F.6.1 Receiving materials |
| 142 | F.6.2 Pre-installation testing F.6.3 Visual examination F.6.4 Insulation resistance test F.6.5 Component substitution F.6.6 Location of power supply |
| 143 | Table F.1 – Pre-installation checks F.7 Installation of trace heaters F.7.1 General |
| 144 | F.7.2 Connections and terminations F.7.2.2 Connection kits F.7.2.3 Junction boxes F.7.2.4 Cold leads F.7.2.5 Trace heater entries and glands |
| 145 | F.7.2.6 Jointing, splicing and modifications F.7.2.7 End terminations F.7.3 Conductor terminations F.8 Installation of control and monitoring equipment F.8.1 Verification of equipment suitability F.8.2 Sensor considerations |
| 146 | F.8.2.2 Sensor installation for temperature controller F.8.2.3 Sensor installation for temperature limiting device |
| 147 | Figure F.1 – Typical installation of control sensor and sensor for temperature limiting control |
| 148 | Figure F.2 – Limiting device sensor on sheath of trace heater |
| 149 | Figure F.3 – Limiting device sensor as artificial hot spot F.8.3 Controller operation, calibration, and access |
| 150 | F.9 Installation of thermal insulation system F.9.1 General F.9.2 Preparatory work F.10 Installation of distribution wiring and coordination with branch circuits F.10.1 General F.10.2 Tagging/identification F.11 Final installation review F.11.1 Necessary modifications |
| 151 | F.11.2 Field (site work) circuit insulation resistance test F.11.3 Visual inspection F.12 Commissioning F.12.1 Pre-commissioning check F.12.2 Functional check and final documentation F.12.2.2 Functional check |
| 152 | F.12.2.3 Final documentation |
| 153 | Table F.2 – Electrical trace heating systems installation record – Example |
| 155 | Annex AH associated apparatus with linear current/voltage characteristics AH.1 General AH.2 Intrinsic safety with level of protection “ib” AH.3 Intrinsic safety with level of protection “ic” |
| 156 | Annex BI BI.1 Intrinsically safe circuits with linear current/voltage characteristics |
| 157 | Figure BI.1 – Series connection – Summation of voltage Figure BI.2 – Parallel connection – Summation of currents |
| 158 | Figure BI.3 – Series and parallel connections – Summations of voltages and summations of currents I.2 Intrinsically safe circuits with non-linear current/voltage characteristics |
| 159 | Annex CJ (informative) CJ.1 Measurements C.2 Multi-core cables J.2 Cables carrying more than one intrinsically safe circuit J.2.1 General CJ.2.12 Type A multi-core cables |
| 160 | CJ.2.23 Type B multi-core cables CJ.2.34 Other multi-coreType C cables CJ.3 FISCO |
| 161 | (normative) K.1 General K.2 Inherently safe optical radiation “op is” K.2.1 General K.2.2 Change of cross sections K.2.3 Coupler K.3 Protected optical radiation “op pr” K.3.1 General |
| 162 | K.3.2 Radiation inside enclosures K.4 Optical radiation interlocked with optical breakage “op sh” |
| 163 | Annex GL (informative) Figure GL.1 – Examples for dust layers of excessive thickness with the requirement of laboratory investigation |
| 164 | M.1 General M.2 Concentration limits M.3 Energy/temperature limits M.4 Selection of equipment M.5 Use of flameproof equipment M.6 Electrostatic hazard M.7 Installation requirements |
| 165 | H.3 Portable and transportable equipment H.4 Fans |
| 166 | Annex I I.1 Introduction I.2 Historical background |
| 167 | I.3 General I.3.1 Mines susceptible to firedamp (Group I) I.3.1.2 EPL Mb I.3.2 Gases (Group II) I.3.2.2 EPL Gb I.3.2.3 EPL Gc I.3.3 Dusts (Group III) |
| 168 | I.3.3.2 EPL Db I.3.3.3 EPL Dc Table I.1 – Traditional relationship of EPLs to zones (no additional risk assessment) |
| 169 | Table I.2 – Description of risk of ignition protection provided |
| 171 | Bibliography |
| 173 | National Annex NA Selection of cable glands for flameproof enclosures NA.1 Introduction NA.2 Background |
| 175 | NA.3 IEC 60079-14:2013 (Edition 5) NA.4 UK committee concerns NA.5 Recommendation by the UK committee for users of this standard and notice of future intent |
