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BS EN IEC 60079-25:2022

BS EN IEC 60079-25:2022

$198.66

Explosive atmospheres – Intrinsically safe electrical systems

Published By Publication Date Number of Pages
BSI 2022 68
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IEC 60079-25:2020 contains the specific requirements for design, construction and assessment of intrinsically safe systems, Type of Protection “i”, 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.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 Annex ZA (normative)Normative references to international publicationswith their corresponding European publications
8 Annex ZZ (informative)Relationship between this European Standard and the Essential Requirements of 2014/34/EU [2014 OJ L96] aimed to be covered
11 English
CONTENTS
13 FOREWORD
18 1 Scope
2 Normative references
3 Terms and definitions
20 4 Descriptive system document
5 Grouping and temperature classification
6 Levels of Protection
6.1 General
21 6.2 Level of Protection “ia”
6.3 Level of Protection “ib”
6.4 Level of Protection “ic”
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
22 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
23 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
24 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
25 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
26 Figures
Figure 1 – Systems analysis
27 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
28 12.8 Faults in multi-circuit cables
12.9 Type verifications and type tests
13 Predefined systems
29 Annex A (informative)Assessment of a simple intrinsically safe system
30 Tables
Table A.1 – Simple system analysis
31 Annex B (informative)Assessment of circuits with more than one power source
32 Figure B.1 – Power sources connected in series
33 Figure B.2 – Power sources connected in parallel
Figure B.3 – Power sources not deliberately connected
34 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
35 Figure C.1 – Equivalent circuit and output characteristic of resistive circuits
Table C.1 – Parameters necessary to describe the output characteristic
37 C.3 Assessment of interconnection possibilities and resultant output characteristics
Figure C.2 – Output characteristic and equivalent circuit of a sourcewith trapezoidal characteristic
40 C.4 Determination of intrinsic safety and the use of graphs
Figure C.3 – Current and/or voltage addition for interconnections
41 Table C.2 – Assignment of diagrams to equipment Groups and inductances
42 C.5 Verification against IEC 60079-11
C.6 Illustration of the procedure
Figure C.4 – Example of an interconnection
44 Figure C.5 – Sum characteristics for the circuit as given in Figure C.4
45 Figure C.6 – Current and/or voltage addition for the example given in Figure C.4
46 C.7 Limit curves for universal source characteristic
51 Figure C.7 – Limit curve diagram for universal source characteristic − Group IIC
56 Figure C.8 – Limit curve diagram for universal source characteristic – Group IIB
57 Annex D (informative)Verification of inductive parameters
58 Figure D.1 – Typical inductive circuit
59 Annex E (informative)Example format for a descriptive system document
60 Figure E.1 – Typical block diagram for IS system descriptive system document
61 Annex F (informative)Use of simple apparatus in systems
F.1 General
62 F.2 Use of apparatus with ‘simple apparatus’
63 Annex G (normative)FISCO systems
G.1 General
G.2 System requirements
G.2.1 General
64 G.3 Additional requirements of “ic” FISCO systems
65 Figure G.1 – Typical system
66 Bibliography

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BS EN IEC 60079-25:2022
$198.66