GB/T 3836.18-2024 PDF English
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Explosive atmospheres - Part 18: Intrinsically safe electrical systems
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Explosive atmospheres -- Part 18: Intrinsically safe electrical systems
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Explosive atmospheres -- Part 18: Intrinsically safe system
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GB/T 3836.18-2024: Explosive atmospheres - Part 18: Intrinsically safe electrical systems---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT3836.18-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB/T 3836.18-2017
Explosive atmospheres - Part 18: Intrinsically safe electrical
systems
(IEC 60079-25:2020, Explosive atmospheres - Part 25: Intrinsically safe electrical
systems, MOD)
ISSUED ON: MARCH 15, 2024
IMPLEMENTED ON: OCTOBER 01, 2024
Issued by: State Administration for Market Regulation;
National Standardization Administration.
Table of Contents
Foreword ... 4
Introduction ... 9
1 Scope ... 12
2 Normative references ... 12
3 Terms and definitions ... 13
4 System descriptive document ... 14
5 Classes and temperature groups ... 15
6 Protection level ... 16
6.1 General... 16
6.2 "ia" protection level ... 16
6.3 "ib" protection level ... 16
6.4 "ic" protection level ... 16
7 Non-intrinsically safe circuits ... 17
8 Interconnection lines/cables of intrinsically safe system ... 17
8.1 General... 17
8.2 Cables containing a single intrinsically safe circuit ... 17
8.3 Cables containing multiple intrinsically safe circuits ... 17
9 Requirements for single-circuit and multi-circuit cables ... 18
9.1 General... 18
9.2 Dielectric strength ... 18
9.3 Intrinsic safety parameters of cables ... 19
9.4 Conductive shielding ... 19
9.5 Types of multi-circuit cables ... 19
10 Enclosure ... 20
11 Grounding and equipotential bonding of intrinsically safe systems ... 20
12 Evaluation of intrinsically safe systems ... 21
12.1 General ... 21
12.2 Systems containing only devices certified in accordance with GB/T 3836.4 ... 21
12.3 Systems containing devices that have not been evaluated individually in accordance
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document is Part 18 of GB(/T) 3836 "Explosive atmospheres". GB(/T) 3836 has
published the following parts:
- Part 1: General requirements;
- Part 2: Equipment protection by flameproof enclosures "d";
- Part 3: Equipment protection by increased safety "e";
- Part 4: Equipment protection by intrinsic safety “i”;
- Part 5: Equipment protection by pressurized enclosure p;
- Part 6: Equipment protection by liquid immersion “o”;
- Part 7: Equipment protection by powder filling “q”;
- Part 8: Equipment protection by type of protection “n”;
- Part 9: Equipment protection by encapsulation “m”;
- Part 11: Material characteristics for gas and vapor classification - Test methods and
data;
- Part 12: Material characteristics for combustible dusts - Test methods;
- Part 13: Equipment repair, overhaul, reclamation and modification;
- Part 14: Classification of locations - Explosive atmospheres;
- Part 15: Electrical installations design, selection and erection;
- Part 16: Electrical installations inspection and maintenance;
- Part 17: Equipment protection by pressurized room “p” and artificially ventilated
room “v”;
- Part 18: Intrinsically safe electrical systems;
- Part 20: Equipment with equipment protection level (EPL) Ga;
- Part 21: Application of quality management systems for Ex product manufacture;
- Part 22: Protection of equipment and transmission system using optical radiation;
- Part 23: Group I, category EPL Ma equipment intended to remain functional in
atmospheres endangered by firedamp and/or coal dust;
- Part 24: Equipment protection by special protection “s”;
- Part 25: Requirements for process sealing between flammable process fluids and
electrical systems;
- Part 26: Electrostatic hazards - Guidance;
- Part 27: Electrostatic hazards - Test;
- Part 28: Non-electrical equipment for explosive atmospheres - Basic method and
requirements;
- Part 29: Non-electrical equipment for explosive atmospheres - Constructional
safety “c”, control of ignition source “b”, liquid immersion “k”;
- Part 30: Equipment and components in explosive atmospheres in underground
mines;
- Part 31: Equipment dust ignition protection by enclosure “t”;
- Part 32: Intrinsically safe systems with electronically controlled spark duration
limitation;
- Part 33: Equipment in adverse service conditions;
- Part 34: Equipment assemblies;
- Part 35: Classification of areas for explosive dust atmospheres;
- Part 36: Electrical safety devices for the control of potential ignition sources from
Ex Equipment.
This document replaces GB/T 3836.18-2017 "Explosive atmospheres - Part 18:
Intrinsically safe electrical systems". Compared with GB/T 3836.18-2017, in addition
to structural adjustments and editorial changes, the main technical changes are as
follows:
- CHANGE the content of the system description file (see Chapter 4; Chapter 4 of
the 2017 edition);
- CHANGE the requirements for categories and temperature groups, including the
original Chapter 7 ambient temperature ratings (see Chapter 5; Chapters 5 and 7 of
the 2017 edition);
Explosive atmospheres - Part 18: Intrinsically safe electrical
systems
1 Scope
This document specifies special requirements for the design, structure, and assessment
of intrinsically safe systems (explosion-proof type "i").
This document applies to intrinsically safe systems that are intended to be used in whole
or in part in places where Class I, Class II or Class III Ex equipment is required.
Note 1: This document is used for the design and assessment of intrinsically safe systems; its
personnel may be the manufacturer, third-party organization, expert consultant or end-user staff.
This document supplements and modifies the general requirements of GB/T 3836.1 and
the intrinsic safety type of GB/T 3836.4. When the requirements of this document
conflict with the requirements of GB/T 3836.1 or GB/T 3836.4, the requirements of this
document take precedence.
The installation requirements of Class II or Class III intrinsically safe systems, which
are designed in accordance with this document, are specified in GB/T 3836.15.
Note 2: GB/T 3836.15 currently does not specify the installation requirements for Class I; the
installation requirements for Class I are under consideration.
2 Normative references
The contents of the following documents constitute essential clauses of this document
through normative references in the text. Among them, for dated references, only the
version corresponding to that date applies to this document; for undated references, the
latest version (including all amendments) applies to this document.
GB/T 3836.1 Explosive atmospheres - Part 1: Equipment - General requirements
(GB/T 3836.1-2021, IEC 60079-0:2017, MOD)
GB/T 3836.4 Explosive atmospheres - Part 4: Equipment protection by intrinsic
safety "i" (GB/T 3836.4-2021, IEC 60079-11:2011, MOD)
GB/T 3836.15 Explosive atmospheres - Part 15: Electrical installations design,
selection and erection (GB/T 3836.15-2017, IEC 60079-14:2007, MOD)
GB/T 16657.2 Industrial communication networks - Fieldbus specifications - Part 2:
connection to the combined power source:
- Maximum external capacitance Co; and
- Maximum external inductance Lo; or
- Maximum inductance to resistance ratio L/R of the connecting cable.
Any test-based verification shall be performed using a spark test device in accordance
with GB/T 3836.4, taking into account the safety factor of the combined device.
The Ui, Ii, Pi of each device in the system shall be greater than or equal to the Uo, Io, Po
determined above, respectively.
Note 2: Appendix E illustrates the analysis used in the most common combination of linear
resistor-limited output power sources. Alternatively, GB/T 3836.15 provides a simplified
analysis for Class II circuits with protection level "ib" where the power source is an associated
device. The analysis may also include a spark ignition test in accordance with GB/T 3836.4.
12.5.2 Systems containing linear and non-linear power sources
The assessment of a system containing multiple power sources, one or more of which
are non-linear, shall be performed by a person with appropriate competence and
knowledge in the design and safety of non-linear intrinsically safe power sources. This
assessment cannot be based solely on open circuit voltage and short circuit current.
Any special conditions related to the system shall be clearly stated in the system
descriptive document.
If the intrinsically safe system contains multiple power sources, one or more of which
are non-linear, the assessment method described in Appendix E does not apply.
Appendix F describes how to perform a system analysis for a combination containing
a single non-linear power source.
Figure 1 illustrates the principle of system analysis.
If the power sources have different output voltages, any additional losses in the
regulating circuit need to be considered.
For non-linear sources, the combined Lo/Ro may be determined by testing the circuit
using the spark ignition test in GB/T 3836.4 with several discrete values of Lo and Ro,
using values of Ro ranging from nearly short circuit (maximum Io) to nearly open circuit
(Io near zero), and establishing a trend that ensures that Lo/Ro passes the spark ignition
test.
Note 1: Appendix F provides further guidance, including an assessment method that does not
require spark ignition testing for systems with no more than one non-linear source.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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