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BS EN IEC 60079-25:2022 2023

BS EN IEC 60079-25:2022 2023

$198.66

Explosive atmospheres – Intrinsically safe electrical systems

Published By Publication Date Number of Pages
BSI 2023 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
4 Blank Page
20 6.1 General
21 6.2 Level of Protection “ia”
6.3 Level of Protection “ib”
6.4 Level of Protection “ic”
8.1 General
8.2 Cables containing a single intrinsically safe circuit
8.3 Cables containing more than one intrinsically safe circuit
22 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
24 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 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
30 Table A.1 – Simple system analysis
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 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
58 Figure D.1 – Typical inductive circuit
60 Figure E.1 – Typical block diagram for IS system descriptive system document
61 F.1 General
62 F.2 Use of apparatus with ‘simple apparatus’
63 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

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BS EN IEC 60079-25:2022 2023
$198.66