IEC 60079-25:2020 contains the specific requirements for design, construction and assessment of intrinsically safe systems, Type of Protection \u201ci\u201d, intended for use, as a whole or in part, in locations in which the use of Group I, II or III Ex Equipment is required. This document supplements and modifies the general requirements of IEC 60079-0 and the intrinsic safety standard IEC 60079-11. Where a requirement of this standard conflicts with a requirement of IEC 60079-0 or IEC 60079-11, the requirement of this standard takes precedence. The installation requirements of Group II or Group III systems designed in accordance with this standard are specified in IEC 60079-14. This third edition cancels and replaces the second edition published in 2010 and constitutes a technical revision.<\/p>\n
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| 2<\/td>\n | undefined <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Annex ZA (normative)Normative references to international publicationswith their corresponding European publications <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Annex ZZ (informative)Relationship between this European Standard and the Essential Requirements of 2014\/34\/EU [2014 OJ L96] aimed to be covered <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 1 Scope 2 Normative references 3 Terms and definitions <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 4 Descriptive system document 5 Grouping and temperature classification 6 Levels of Protection 6.1 General <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 6.2 Level of Protection \u201cia\u201d 6.3 Level of Protection \u201cib\u201d 6.4 Level of Protection \u201cic\u201d 7 Non-intrinsically safe circuits 8 Interconnecting wiring \/ cables used in an intrinsically safe system 8.1 General 8.2 Cables containing a single intrinsically safe circuit 8.3 Cables containing more than one intrinsically safe circuit <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | 9 Requirements of single and multi-circuit cables 9.1 General 9.2 Dielectric strength 9.2.1 Cables containing a single intrinsically safe circuit 9.2.2 Cables containing more than one intrinsically safe circuit 9.3 Intrinsic safety parameters of cables <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | 9.4 Conducting screens 9.5 Types of multi-circuit cables 9.5.1 General 9.5.2 Type A cable 9.5.3 Type B cable 9.5.4 Type C cable 10 Enclosures 11 Earthing and bonding of intrinsically safe systems <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 12 Assessment of an intrinsically safe system 12.1 General 12.2 Systems containing only apparatus certified to IEC 60079-11 12.3 Systems containing apparatus not separately evaluated to IEC 60079-11 12.4 Systems containing a single power source <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 12.5 Systems containing more than one power source 12.5.1 General 12.5.2 Systems containing linear and non-linear sources of power <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Figures Figure 1 \u2013 Systems analysis <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 12.6 Simple apparatus 12.7 Assessment of capacitance, inductance and cable L\/R 12.7.1 General 12.7.2 Unspecified Parameters 12.7.3 Output Parameter adjustments for Level of Protection 12.7.4 Effect of combined lumped capacitance and inductance 12.7.5 Determination of L\/R <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 12.8 Faults in multi-circuit cables 12.9 Type verifications and type tests 13 Predefined systems <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Annex A (informative)Assessment of a simple intrinsically safe system <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Tables Table A.1 \u2013 Simple system analysis <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Annex B (informative)Assessment of circuits with more than one power source <\/td>\n<\/tr>\n | ||||||
| 32<\/td>\n | Figure B.1 \u2013 Power sources connected in series <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Figure B.2 \u2013 Power sources connected in parallel Figure B.3 \u2013 Power sources not deliberately connected <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Annex C (informative)Interconnection of non-linear and linear intrinsically safe circuits C.1 General C.2 Assessment of the output characteristics of the power sources <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Figure C.1 \u2013 Equivalent circuit and output characteristic of resistive circuits Table C.1 \u2013 Parameters necessary to describe the output characteristic <\/td>\n<\/tr>\n | ||||||
| 37<\/td>\n | C.3 Assessment of interconnection possibilities and resultant output characteristics Figure C.2 \u2013 Output characteristic and equivalent circuit of a sourcewith trapezoidal characteristic <\/td>\n<\/tr>\n | ||||||
| 40<\/td>\n | C.4 Determination of intrinsic safety and the use of graphs Figure C.3 \u2013 Current and\/or voltage addition for interconnections <\/td>\n<\/tr>\n | ||||||
| 41<\/td>\n | Table C.2 \u2013 Assignment of diagrams to equipment Groups and inductances <\/td>\n<\/tr>\n | ||||||
| 42<\/td>\n | C.5 Verification against IEC 60079-11 C.6 Illustration of the procedure Figure C.4 \u2013 Example of an interconnection <\/td>\n<\/tr>\n | ||||||
| 44<\/td>\n | Figure C.5 \u2013 Sum characteristics for the circuit as given in Figure C.4 <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Figure C.6 \u2013 Current and\/or voltage addition for the example given in Figure C.4 <\/td>\n<\/tr>\n | ||||||
| 46<\/td>\n | C.7 Limit curves for universal source characteristic <\/td>\n<\/tr>\n | ||||||
| 51<\/td>\n | Figure C.7 \u2013 Limit curve diagram for universal source characteristic \u2212 Group IIC <\/td>\n<\/tr>\n | ||||||
| 56<\/td>\n | Figure C.8 \u2013 Limit curve diagram for universal source characteristic \u2013 Group IIB <\/td>\n<\/tr>\n | ||||||
| 57<\/td>\n | Annex D (informative)Verification of inductive parameters <\/td>\n<\/tr>\n | ||||||
| 58<\/td>\n | Figure D.1 \u2013 Typical inductive circuit <\/td>\n<\/tr>\n | ||||||
| 59<\/td>\n | Annex E (informative)Example format for a descriptive system document <\/td>\n<\/tr>\n | ||||||
| 60<\/td>\n | Figure E.1 \u2013 Typical block diagram for IS system descriptive system document <\/td>\n<\/tr>\n | ||||||
| 61<\/td>\n | Annex F (informative)Use of simple apparatus in systems F.1 General <\/td>\n<\/tr>\n | ||||||
| 62<\/td>\n | F.2 Use of apparatus with \u2018simple apparatus\u2019 <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Annex G (normative)FISCO systems G.1 General G.2 System requirements G.2.1 General <\/td>\n<\/tr>\n | ||||||
| 64<\/td>\n | G.3 Additional requirements of \u201cic\u201d FISCO systems <\/td>\n<\/tr>\n | ||||||
| 65<\/td>\n | Figure G.1 \u2013 Typical system <\/td>\n<\/tr>\n | ||||||
| 66<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Explosive atmospheres – Intrinsically safe electrical systems<\/b><\/p>\n |