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GB 12476.4-2010: Electrical apparatus for use in the presence of combustible dust -- Part 4: Protection by intrinsic safety iD
GB 12476.4-2010
Electrical apparatus for use in the presence of combustible dust.Part 4. Protection by intrinsic safety iD
ICS 29.260.20
K35
National Standards of People's Republic of China
Combustible dust Electrical Equipment
Part 4. Intrinsic safety "iD"
Part 4. Protectionbyintrinsicsafety "iD"
(IEC 61241-11.2005, IDT)
Issued on. 2010-08-09
2011-08-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Introduction ???
Introduction ???
1 Scope 1
2 Normative references 3
3 Terms and definitions 3
4 Grouping and classification of intrinsically safe apparatus and associated equipment 3
Level 5 electrical equipment 3
6 equipment Structure 3
7 elements with intrinsic safety-related 4
8 reliable components, reliable components and reliable connection 5
Barrier diode 9 5
10 type test 5
11 routine inspection and test 6
12 6 Flag
13 Document 7
Appendix A (normative) 8
Annex B (informative) 8
Annex C (normative) 8
Table 1 IEC 61241-0.2004 applies specific provisions 1
Table 2 allows the power dissipation member 4
Foreword
All technical content in this section is mandatory.
GB 12476 "combustible dust electrical equipment" is divided into several parts.
--- Part 1. General requirements
--- Part 2. Selection and installation
--- Part 3. combustible dusts exist or may exist Classification of hazardous areas
--- Part 4. Intrinsic safety "iD"
--- Part 5. Housing protection type "tD"
--- Part 6. protective encapsulation "mD"
--- Part 7. protective positive pressure "pD"
--- Part 8. Test methods for determining the minimum ignition temperature of a dust
--- Part 9. Test method for determination of the dust layer resistivity
--- Part 10. Test methods for dust and air mixture Determination of minimum ignition energy
Part of this section is GB 412 476, the equivalent to using IEC 61241-11.2005 "combustible dust Electrical apparatus
Part 11. Intrinsic safety "iD" "(2005 English edition).
This part of IEC 61241-11.2005 was the following editorial changes.
--- Remove the IEC 61241-11.2005 Foreword;
--- Increase the national standard foreword.
This section of the Appendices A and C are normative appendix, Appendix B is an informative annex.
This part is proposed by the China Electrical Equipment Industrial Association.
This part of the National explosion-proof electrical equipment Standardization Technical Committee (SAC/TC9) focal point and is responsible for interpretation.
This part mainly drafted by. Nanyang Explosion Electric Institute, Shanghai Institute of Industrial Automation Instrumentation.
This part of the main participants. National explosion-proof electrical products for Quality Supervision and Inspection Center, Shenzhen Tean Electronics Co., Ltd. Huarong Group has
Ltd., Fushun Branch Coal Research Institute, blast Electric Co., Ltd.
The main drafters of this section. Xu Jianping, Zhang Gang, Fu Shuling, Wang Ping, Liu Heng Yun, Li River.
introduction
Many of dust generated in the production, processing, transportation and storage are flammable. If dust is mixed with air into proper proportion, when the point
When burning dust can quickly burn a tremendous explosion pressure. May appear in place of such combustible material usually requires the use of
Explosion-proof electrical equipment, it is necessary to take appropriate precautions to ensure that all such electrical equipment adequately protected to reduce ignition
The possibility of an external explosive atmosphere. Electrical apparatus, potential ignition sources include arcs and sparks, hot surfaces and friction sparks.
Spaces appear in the air dangerous quantities of dust, fibers and Fei Xu is divided into a dangerous place, and is divided according to the level of danger
Three hazardous areas.
Under normal circumstances, one of two methods to ensure the electrical safety of electrical equipment, namely. a method (whenever practicable) should
Electrical equipment installed in hazardous locations, the alternative approach to design, installation and maintenance of electrical equipment in accordance with the method recommended by the use of premises.
Electrical equipment could ignite combustible dust by following several main ways.
--- Electrical equipment related to the surface temperature is higher than the minimum ignition temperature of the dust. Dust ignition temperature and dust properties, the presence of dust-like
State, the thickness of the layers of dust and heat of the geometric shape.
--- Electrical components (such as switches, contacts, rectifiers, brushes and the like) of arcs or sparks.
--- Accumulation of electrostatic charge and discharge.
--- Radiant energy (electromagnetic radiation).
--- Mechanical and electrical equipment related to sparks, friction sparks or friction heat.
In order to avoid ignition hazards should do the following.
--- May accumulate dust or electrical equipment may come into contact with the surface temperature of the dust cloud shall be kept at the temperature limit specified in this section
the following;
--- Any spark or component temperature above the temperature limit specified in GB 12476.2 member shall.
??? placed in a sufficient to prevent dust entering the enclosure, or
??? limiting circuit to avoid energy capable of igniting combustible dust arcs, sparks or temperature;
--- Avoid any other ignition source.
Hazardous areas explosion-proof electrical equipment using several techniques. This section describes the technical characteristics of the type of protection of the safety provisions of the Mining
Take requirement. To ensure the safe use of electrical equipment in hazardous locations, comply with standard procedures of selection and installation of the most important.
If electrical equipment is running at its rated conditions, and be installed and maintained in accordance with the Code or regulations (such as prevention of over-current, internal
Short circuit and other circuit fault), for compliance with the requirements of this section GB 12476 includes only the required level of security. In particular, the internal or
Duration and severity of the external fault is limited to the electrical equipment can withstand without damage to the range is the most important, for example, should meet
IEC 60079-25 principle of co-design, and in accordance with GB 12476.2 requirements for installation.
We must comply with the following principles.
--- GB 3836.4 circuitry must meet the requirements in respect ???B category, in order to avoid the risk of spark ignition.
--- Requires IP6X or encapsulation technology in order to avoid the use of dust affect clearances and creepage distances. Thus, for housing or encapsulated to
That its overall integrity and importance of durability is much higher than the requirements of GB 3836.4.
--- Components (such as non-insulated probe) electrical equipment or electrical equipment without a crust or without encapsulation protection should be limited in order to avoid to protect
Since the energy dissipated directly into the accumulation of dust layer (by matching the energy conductive dust) caused by ignition, or parts table
Hot surface ignition.
--- For more than limit the power limit for all devices or equipment parts, in accordance with IEC 61241-0 limits its exposed surface
temperature. Surface may be a surface or encapsulated in the surface of the housing.
Combustible dust Electrical Equipment
Part 4. Intrinsic safety "iD"
1 Scope
GB 12476 of the provisions of this part of intrinsically safe electrical equipment exists dust cloud or dust layer for use in potentially explosive atmospheres,
Design and testing requirements and the corresponding environment related equipment intrinsically safe circuit is connected.
This part is IEC 61241-0. Supplementary 20041), and with the exception of the exclusion clauses in Table 1.
Equipment used in the system will meet the GB 3836.18-2010 "Explosive atmospheres - Part 18. Intrinsic safety system" requirements.
If the device context using IEC 61241-0.2004 or GB 3836.1-2000 the type of protection, the IEC 61241-0.2004
Or in GB 3836.1-2000 for the appropriate type of protection and the requirements of IEC 61241-0.2004 or the corresponding part of the GB 3836 requirements
Also apply to the associated apparatus. Table 1 EXCLUSION mainly for associated equipment for use in non-explosive hazardous environments, so in other cases
With associated equipment should be consistent with other requirements of the type of protection used in combination.
1) coming into the national standard GB 12476.1 "combustible dust Electrical Equipment Part 1. General requirements."
Table 1 IEC 61241-0.2004 specific provisions applicable
IEC 61241-0.2004 clause or sub-clause intrinsically safe equipment associated apparatus
4.1 General Yes
4.2 20 area whether by design criteria and test equipment
4.3 Open-type housing for
4.4 Environmental conditions are
5.1 if the maximum surface temperature
5.2 dust layer thickness of more than 50mm maximum surface temperature is
5.3 yes yes ambient temperature
6.1 Non-metallic enclosures and non-metallic parts if housing
6.1.1 Material specifications are
6.1.2 Are plastic material
6.1.3 verify compliance
6.1.4 Thermal stability whether
6.1.5 whether electrostatic charge
6.2 containing light metal shell whether
6.2.1 Are ingredients
6.2.2 No No threaded hole
7 No No fasteners
8 interlock No No
9 bushings No No
Table 1 (continued)
IEC 61241-0.2004 clause or sub-clause intrinsically safe equipment associated apparatus
10 whether the adhesive material
11 Ex element whether
12 connectors and wiring cavity No No
13 grounding connection and equipotential conductor No No
14 cable and conduit entries whether
15 whether radiation equipment
Supplementary Regulations 16 rotating motor No No
Supplementary Regulations 17 switch No No
Supplementary Regulations 18 fuse No No
Supplementary Regulations 19 connector device No No
Supplementary Regulations 20 lamps No No
Supplementary Regulations 21 and portable lamp cap lamp No No
Supplementary Regulations 22 with a battery of equipment is
23.1 to 23.3 Type inspection and testing yes yes
23.4.1 General whether
23.4.2.1 Impact test whether
23.4.2.2 Drop test whether
23.4.2.3 whether a criterion
23.4.3 Dust Experiment (enclosure class) if
Housing 23.4.4 Zone 20 and Zone 21 of the insulating sleeve torsion test No No
23.4.5.1 Determination of whether the maximum surface temperature
23.4.5.2 thick layer of dust measured at the highest surface temperature whether
23.4.5.3 Temperature control whether
23.4.6 Thermal test whether drastic changes
23.4.7.1 ~
23.4.7.5
Non-metallic parts test area 20 and non-metallic enclosures and housing Zone 21 No No
23.4.7.6 Mechanical tests whether
23.4.7.7 Surface resistance test whether
27 non-armored cable and non-cable braid covering layer clamping test No No
28 armored cable cable clamp test No No
29 flag Yes Yes
Example 30 flag Yes Yes
a use IEC 61241-0.2004 CRITERIA.
This section GB 12476 applies to its own circuit does not cause the surrounding combustible dust explosion electrical equipment. In its
Under his environment, and associated equipment should IEC 61241-0.2004 requirements for other types of protection listed in the combined.
2 Normative references
The following documents contain provisions which, through reference in this Part of GB 12476, constitute provisions of this part. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB 3836.1-2000 Electrical equipment for explosive gas atmospheres - Part 1. General requirements (eqvIEC 60079-0.1998)
GB 3836.4-2000 Electrical equipment for explosive gas atmospheres Part 4 by. Intrinsic safety "i" (eqvIEC 60078-11.
1999)
GB 3836.18-2010 Explosive atmospheres - Part 18. Intrinsically safe systems (IEC 60079-25.2003, IDT)
GB 4208-2008 housing protection (IP Code) (IEC 60529.2001, IDT)
IEC 61241-0.2004 Electrical apparatus for use of combustible dust - Part 0. General requirements
IEC 61241-1.2004 Electrical apparatus for use of combustible dust - Part 1. Housing protection type "tD"
3 Terms and Definitions
IEC 61241-0, GB 3836.1-2000 and GB 3836.4-2000 terms and definitions apply to this section, be noted that,
These standards instead of "explosive atmosphere" Apply "combustible dust" when used in this section.
4 Grouping and classification of intrinsically safe apparatus and associated equipment
Intrinsically safe equipment and associated equipment shall be in accordance with the requirements of IEC 61241-0 grouping and classification.
Level 5 for electrical equipment
Classification of electrical equipment should meet the GB 3836.4-2000 in Chapter 5 and the following requirements.
Equipment should at least meet ???B grade equipment spark ignition energy requirements.
6 construction equipment
6.1 shell
In general, since the circuit already taken measures to protect themselves, so intrinsically safe equipment do not need to shell as a protective measure.
However, since the conductive member may impair intrinsic safety, such as any type of dust could be reliably reduced creepage distance, so according to
IEC 61241-0.2004 requirements, equipment enclosure shall meet at least IP6X degree of protection specified in GB 4208-2008. Other cases
Under conditions, equipment required to achieve enclosure class is determined by the specific conditions of use of the device. No IP6X enclosure class piece of equipment
If its effective encapsulation, and the encapsulation thickness not less than 1mm, shall be considered that can effectively prevent dust from entering. For neither
Shell protection, but also no encapsulation of circuit components, for example, non-insulated probe in direct cont...