GB 12476.2: Evolution and historical versions
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Electrical apparatus for use in the presence of combustible dust -- Part 2: Selection and installation
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GB 12476.2-2010
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Electrical apparatus for combustible dust -- Part 1: The surface temperature of the housing and restrictions to protect electrical equipment -- Section 2: Select the electrical equipment, installation and maintenance
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GB 12476.2-2006
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Basic data | Standard ID | GB 12476.2-2010 (GB12476.2-2010) | | Description (Translated English) | Electrical apparatus for use in the presence of combustible dust -- Part 2: Selection and installation | | Sector / Industry | National Standard | | Classification of Chinese Standard | K35 | | Classification of International Standard | 29.260.20 | | Word Count Estimation | 28,239 | | Date of Issue | 2010-08-09 | | Date of Implementation | 2011-08-01 | | Older Standard (superseded by this standard) | GB 12476.2-2006 | | Quoted Standard | GB 4208-2008; GB/T 6916-1986; GB 12476.1; GB 12476.3-2007; GB 12476.4-2010; GB 12476.6-2010; GB/T 12476.7-2010; GB 12476.8-2010; GB 16895.21-2004; GB 19212.1-2008; IEC 61024-1; IEC 61024-1-1; IEC 61241-0-2004; IEC 61241-1-2004; IEC 61241-17; GB 16895.8; GB 16895.7; GB 16895.6; GB 16895.5; GB 16895.4; GB 16895.3; GB 16895.31; GB 16895.30; GB 16895.29; GB 16895.28; GB 16895.27; GB 16895.26; GB 16895.25; GB 16895.24; GB 16895.2; GB 16895.22; GB 16895.20; GB 16895.19; GB 16895.14; GB 16895.13; GB 16895.12; GB 16895.11 | | Adopted Standard | IEC 61241-14-2004, IDT | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 3, 2010 (No. 158 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This Chinese standard relates to normal or near normal electrical apparatus under atmospheric conditions. This standard does not apply to burn without oxygen can be suspected explosives dust, does not apply to spontaneous combustion substances. This standard does not apply to coal mine electrical equipment, or methane and/or combustible dust may endanger these surface mining equipment parts. This standard does not consider as combustible dust hazardous or toxic gas leak. The requirements of this standard is a non-hazardous location installations and equipment requirements with essential supplement. | GB 12476.2-2010: Electrical apparatus for use in the presence of combustible dust -- Part 2: Selection and installation
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Electrical apparatus for use in the presence of combustible dust.Part 2. Selection and installation
ICS 29.260.20
K35
National Standards of People's Republic of China
Replacing GB 12476.2-2006
Combustible dust Electrical Equipment
Part 2. Selection and installation
Part 2. Selectionandinstalation
(IEC 61241-14.2004, 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 Ⅴ
Introduction Ⅵ
1 Scope 1
2 Normative references 1
3 Terms and definitions 2
All four pairs of common type of protection requirements 5
4.1 Checking route 5
Related non-hazardous location equipment 4.2 5
4.3 Isolation 5
4.4 electrical rating 5
4.5 Protection of mechanical damage and environmental hazards of 5
4.6 Document 5
6 4.7 Qualification
4.8 Additional considerations 6
7 4.9 Explosion Prevention
5 Location Category 7
Select 6 electrical equipment 7
6.1 Approved devices 7
According to dust 6.2 features and area selection 7
6.3 According to temperature selection 8
10 6.4 Device Selection
7 prevent dangerous sparks 11
7.1 11 dangerous live parts
7.2 Dangerous bare outer conductor member 11
7.3 Equipotential 12
7.4 Electrostatic 12
7.5 Electromagnetic radiation 13
7.6 lightning protection 13
7.7 cathodic protection of metal parts 13
8 Electrical Protection 13
8.1 General 13
Location 8.2 protection and control device 13
8.3 short-circuit and ground fault protection device reset 13
8.4 Protection of the rotation of the motor 13
8.5 power phase 13
8.6 Protection of the transformer 13
9 EPO and electrical isolation 13
9.1 Emergency Power Off 13
9.2 electrically isolated 14
10 Cabling System 14
10.1 General 14
10.2 cable and conduit entries 15
10.3 Annex 16
10.4 wiring process 16
10.5 barrier layer 16
10.6 soft connection 16
10.7 cable entry 16
Unauthorized 16 10.8 Method
10.9 Communication circuit 17
10.10 17 used vias
11 plugs and sockets 17
11.1 General 17
11.2 Installation 17
11.3 Location 17
12 pairs of protective shell "ExtD" Supplementary requirements 17
12.1 A and B 17
12.2 A Type 17
12.3 B Type 17
12.4 by the frequency and voltage regulator power supply of the motor 18
13 pairs of positive protective "pD" Supplementary requirements 18
13.1 protective gas source 18
13.2 Auto power off 18
18 13.3 Alarm
13.4 Shared protective gas source 18
13.5 power 18
13.6 by the frequency and voltage regulator power supply of the motor 19
14 pairs of intrinsic safety "iD" Supplementary requirements 19
15 pairs of protective encapsulation "mD" Supplementary requirements 19
16 Installation Check 19
16.1 General 19
16.2 Detection 19
Appendix A (informative) thick layer of dust Example 20
Light metal friction sparks Appendix B (normative) and their alloys dangerous 21
B.1 General 21
B.2 equipment fixed installation 21
B.3 portable and mobile equipment 21
B.4 fan 21
1 relationship between the maximum allowable surface temperature and dust layer thickness 9
Example thick dust layer in Figure A.1 in line with the requirements of 20 laboratory tests
Table 1. Select the device 10 according to the type of protection
Table 2 A type dust tight enclosure 17
Table 3 B-type dust tight enclosure 18
Table 4 Summary of 18 housing protection requirements
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. the presence of combustible dust may be present in dangerous places or classification;
--- 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 212 476, equivalent using IEC 61241-14.2004 "combustible dust Electrical apparatus
Part 14. Selection and Installation "(in English), is GB 12476.2-2006 part in the selection and installation of the amendment. And GB 12476.2-
2006 in the selection and installation of the main changes compared to the part are.
--- Remove the electrical equipment design, construction and testing requirements;
--- Increased 20 terms;
--- Increasing the general requirements for all type of protection;
--- Prevent dangerous spark increased requirements;
--- Increased electrical protection requirements;
--- Increased requirements for plugs and sockets;
--- Added "ExtD" Supplementary requirements;
--- Added "ExpD" Supplementary requirements;
--- Added "ExiD" Supplementary requirements;
--- Added "Normative Appendix B light metals and their alloys friction sparks danger";
--- "Inspection and maintenance requirements" See IEC 61241-17.
This part of IEC 61241-14.2004 was the following editorial changes.
--- Removed in 7.7 Note. "In the absence of cathodic protection of the relevant IEC standards, should follow the national standards or other standards."
Appendix B of this section is normative Appendix Appendix A is informative appendix.
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) centralized.
This part mainly drafted by. Explosion Protection Electric Institute.
This part of the main participants. National explosion-proof electrical products for Quality Supervision and Inspection Center, Changzhou Yuhua Electronic Equipment Co., Huarong set
Group Co., Ltd., Shenzhen City Jin-Ming Technology Co., blast Electric Co., Ltd.
The main drafters of this section. Shu Dynasty, Zhang Gang, Chen Rui, Li Jiang, Zhou Jinliang, Wu Xudong, Zhang Haiou, Huang Jianfeng.
This part of the standard replaces the previous editions are.
--- GB 12476.2-2006.
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. Temperature and dust ignition characteristics of dust, the dust-like presence
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) arcs or sparks.
--- Accumulation of electrostatic charge and discharge.
--- Radiant energy (electromagnetic radiation).
--- Machinery and equipment related to sparks, friction sparks or heat.
In order to avoid ignition hazards should do the following.
--- May accumulate dust or electrical equipment may come into contact with the surface of the dust cloud temperature is maintained at the temperature limit specified in this part
the following;
--- Any spark or component temperature is higher than the temperature limit specified in this part shall.
● Installation 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.
If the electrical equipment under its rated conditions, and in accordance with the appropriate procedures or requirements for the implementation of installation and maintenance, for example, prevent an overcurrent
And an internal short circuit and other electrical faults, the protection method specified in this section will be able to achieve the required level of safety. Of particular importance
Is an internal or external fault severity and duration of the electrical equipment can be maintained in the limit not to damage the value.
Hazardous areas explosion-proof electrical equipment using several techniques. This section describes the type of protection of safety technology features, provides
Taken by the installer. To ensure the safe use of electrical equipment in hazardous locations, comply with standard procedures of selection and installation of the most important.
In this section of the protective housing "tD" it provides for two different types. A and B, both of which have the same type of protection
Level.
A and B two types of GM, which requires use will not confuse the two types of requirements and selection of equipment/installation to
begging. They used a different approach, the main difference is.
A B
The main written mainly in accordance with the normative requirements based on performance requirements to prepare
The maximum surface temperature is related to the dust layer thickness of 5mm of love
Under conditions determined and the installation procedures required in surface temperature and dust
Safety margin between the ignition temperature of 75K
The maximum surface temperature is related to the thickness of the dust layer is 12.5mm
The case was measured, and the installation procedures required in the surface temperature of the dust
Safety margin between the ignition temperature and the degree of 25K
The method of determination of dust into the dust measured by the method according to GB 4208 entered the IP code according to a heat cycle test
Combustible dust Electrical Equipment
Part 2. Selection and installation
1 Scope
This part of GB 12476 specifies the electrical equipment used in the presence of combustible dust quantity can cause a fire or explosion hazard, the instrument
And associated equipment to ensure the safe use of their selection, the general requirements for the installation, is a supplement to basic electrical safety requirements.
Note. The different parts of GB 12476 specifies the design, manufacture and testing of electrical equipment. The scope of this equipment is also in line with other additional criteria
Claim.
In an environment containing explosive gas and combustible dust in use, either simultaneously or separately, are within the scope of this Part
No additional protective measures included.
This section includes several types of protection, they are protected from dust or take the entrance, or insufficient energy to cause ignition and limit surface
temperature.
Fei Xu flammability hazard caused by fiber or also follow the principles in this section.
If the equipment complies with the requirements of other environmental conditions, for example, to prevent the ingress of water and resistance to corrosion, may require additional protection measures. Take measures
Shi should not adversely affect the integrity of the enclosure. The requirements of this section apply only in normal or near normal atmospheric conditions, electrical
equipment. In other cases, it may require additional precautions. For example, most flammable materials and many are generally considered to be non-flammable
Substance under oxygen-rich conditions can be severe burning. Under extreme temperature and pressure on electrical equipment may also take other necessary precautions, these
Preventive measures are not within the provisions of this Part.
This section does not apply to combustion can occur without oxygen Explosives dust, does not apply to spontaneous combustion.
This section does not apply to surface portion coal mine electrical equipment, or methane and/or combustible dust can endanger these mining devices
Member. This section is not considered due to the combustible dust or toxic gas leak dangerous.
The requirements of this provision is non-hazardous area apparatus and equipment requirements indispensable complement.
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 4208-2008 housing protection (IP Code) (IEC 60529.2001, IDT)
GB/T 6919-1986 air quality vocabulary (eqvISO 4225. 1980)
GB 12476.1 combustible dust Electrical Equipment Part 1. General requirements 1)
1) referred to in this section is defined as GB 12476.1 IEC 61241-0.2004 revised version.
GB 12476.3-2007 combustible dust electrical equipment - Part 3. there may be the presence of combustible dust in the workplace or
Classification (IEC 61241-10.2004, IDT)
GB 12476.4-2010 combustible dust electrical equipment Part 4. Intrinsic safety "iD" (IEC 61241-11.
2005, IDT)
GB 12476.6-2010 combustible dust electrical equipment - Part 6. protective encapsulation "mD" (IEC 61241-18.
2004, IDT)
GB/T 12476.7-2010 combustible dust electrical equipment - Part 7. protective positive pressure "pD" (IEC 61241-4.
2001, IDT)
GB 12476.8-2010 combustible dust electrical equipment - Part 8. Determination of the minimum ignition temperature of dust Test Method
Method (IEC 61241-2-1.1994, IDT)
GB 16895 (all parts), Electrical installations of buildings (IEC 60364 series, IDT)
Part 4-41 GB 16895.21-2004 Electrical installations of buildings. Protection for safety Protection against electric shock (IEC 60364-4-41.
2001, IDT)
GB 19212.1-2008 power transformers, power supplies, reactors and similar products - Part 1. General requirements and tests
(IEC 61558-1.2005, IDT)
Part 1 anti-lightning protection of buildings IEC 61024-1. general rules
Section 1 General rule.. Part 1 IEC 61024-1-1 building anti-lightning protection Directory A --- lightning protection system protection
Level Selection
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"
IEC 61241-17 Electrical apparatus for combustible dust - Part 17. Inspection and maintenance of electrical installations
3 Terms and Definitions
The following terms and definitions apply to this section.
3.1
Place area
Three-dimensional region or space.
3.2
Insulating sleeve bushing
Insulating member for the one or more conductors through the housing wall.
3.3
Certificate certificate
Verify that the device meets the requirements, type testing and criteria involved in routine tests (if applicable) files.
Note 1. One certificate can be for a single device or Ex Ex component.
Note 2. The certificate may be issued by the state authorized inspection agency.
3.4
Combustible dust combustibledust
Combustible at atmospheric conditions and normal temperature or heat in the air and may form explosive mixtures with air, dust, fibers, or
Fei Xu.
3.5
Conductive dust conductivedust
Resistivity of 103Ω · m or less dust, fibers, or catkins.
3.6
Dust dust
In the air can settle down on its own weight, but sometimes can be suspended fine solid particles in the air (including the GB/T 6919 in
Definition of dust and gravel).
3.7
Dustproof enclosure dust-protectedenclosure
Not completely prevent dust entering the amount, but enough to affect their access to safe operation of equipment housing.
Note. not accumulate dust content in the housing can lead to ignition hazard areas.
3.8
Dust tight enclosure dust-tightenclosure
You can prevent all visible dust particles into the shell.
3.9
Housing protection type "tD" protectionbyenclosures "tD"
One kind of type of protection for electrical equipment. Can prevent all visible dust particles into the dust tight housing or not completely prevent dust entering but
Enter an amount insufficient to affect the safe operation of equipment housing.
Note. not accumulate dust content in the housing can lead to ignition hazard areas.
3.10
Electrical equipment electricalapparatus
All or part of the use of power equipment.
Note. including power generation, transmission, distribution, storage, measuring, regulating, converters, electrical equipment and communications equipment.
3.11
Protective encapsulation "mD" encapsulation "mD"
One kind of type of protection for electrical equipment. This pattern is likely to ignite a spark or heat-generating components explosive atmospheres enclosed complex
, Allowing them to avoid running or installation conditions ignite the dust cloud or dust layer.
3.12
Equipotential equipotentialbonding
Under normal or fault conditions identical bare metal part of the voltage of the electrical connection.
3.13
Ex element Excomponent
And can not be used with the symbol "U", when used in conjunction with electrical equipment or systems, require additional certification for explosive atmospheres Electrical
Parts or components of the device.
3.14
Explosion protection explosionprotection
Apply to equipment or parts of equipment to prevent the ignition of protection technology in hazardous areas of combustible dust occur.
3.15
Explosive dust environment explosivedustatmosphere
Flammable substance in the form of dust, fibers, or catkins of a mixture with air under atmospheric conditions, after being ignited, will burn unburned
The mixture continues to spread in the environment.
[IEV60426-02-4, revised]
3.16
Hazardous Locations hazardousarea
In the form of combustible dust cloud of dust appeared in large numbers or expectations may have emerged, so that the requirements for the structure and use of special equipment to take
Special measures to prevent explosive dust/air mixture is ignited place.
NOTE. hazardous locations according to the frequency and duration of explosive dust/air mixture which appears to be partitioned.
3.17
Ignition source ignitionsource
Including open flames, hot surfaces, photothermal materials, sparks or hot particles, etc., enough energy to ignite an explosive environment.
3.18
Intrinsic Safety "iD" intrinsicsafety "iD"
One kind of type of protection for electrical equipment. By limiting any electrical equipment and internal exposure to explosive atmospheres generated by connecting wires
Spark or thermal effect, it is lower than the energy produced can cause ignition energy.
Note. Because this method to achieve intrinsically safe, so it must ensure that exposure to potentially explosive atmospheres electrical equipment and other interconnected devices have combined
Suitable structure.
3.19
Instrument instrument
For measurement, control, calculation of the amount of physical or chemical apparatus.
3.20
The minimum ignition temperature of a dust layer minimumignitiontemperatureofadustlayer
Minimum ignition temperature of the hot surface of the predetermined thickness of the dust layer occurs on hot surfaces.
[GB 12476.8-2010, the definition 3.3]
3.21
Dust cloud minimum ignition temperature minimumignitiontemperatureofadustcloud
The lowest temperature in the furnace air contained in the inner wall of the furnace occurred when the dust cloud ignited.
[GB 12476.8-2010, the definition 3.5]
3.22
The maximum surface temperature maximumsurfacetemperature
At the maximum ambient temperature specified conditions, when in the absence of dust or dust layer conditions specified test, any part of the surface of electrical equipment
The maximum temperature reached.
NOTE. The temperature under test conditions to obtain, since the dust with insulation effect, the temperature increases with increasing thickness of the dust layer.
3.23
The maximum allowable surface temperature maximumpermissiblesurfacetemperature
Under actual operating conditions for the ignition of the electrical equipment to avoid surface allows the maximum temperature reached.
NOTE. Whether it is dust cloud or dust layer, its maximum allowable surface temperature depends on the type of dust, if dust layer, depending on their thickness and the applied security system
number. See 6.3.
3.24
Positive protective "pD" pressurization "pD"
One kind of type of protection for electrical equipment. Maintaining the interior of the housing overpressure above ambient, in order to avoid the formation of explosive powder inside the shell
Methods dust environment.
3.25
Spontaneous substance pyrophoricsubstance
Exposed to air (for example. P) or water (for example. potassium or sodium) naturally catch fire.
3.26
Release source sourceofrelease
It may release flammable material into the atmosphere to form the site or place an explosive environment.
3.27
Explosion-proof type typeofprotection
Various specific measures to be taken to prevent the ignition of an explosive atmosphere surrounding electrical equipment.
3.28
Verify file verificationdossier
Electrical equipment and apparatus display a set of compliance documents.
3.29
Open wiring wiring, open
Non-sheathed cable installation which does not require further protection cabling system.
3.30
Symbol "X" symbol "X"
It is used to indicate special conditions for safe use of symbols.
Note. The symbol "X" and the symbol "U" can not be used.
3.31
Symbol "U" symbol "U"
Ex symbol used to represent the elements.
Note. The symbol "X" and the symbol "U" can not be used.
3.32
Area zones
According to the frequency and duration of explosive dust/air environment for explosive dust environment appears divided region.
3.33
Zone 20 zone20
Combustible dust cloud in the air long-term consecutive or region form an explosive environments often.
3.34
Zone 21 zone21
During normal operation, the air may occasionally occur combustible dust cloud formation region explosive atmospheres.
3.35
22 area zone22
During normal operation, the air of combustible dust cloud unlikely, if only for a short time in the presence of an explosive environment
area.
General requirements for all four pairs of the type of protection
As a complement to GB 16895 no combustible dust hazard areas means, the following provisions are used for combustible dust means
Additional requirements.
When the electrical equipment installed in 20 areas, the choice of equipment to deal with special considerations.
4.1 Checking route
Design of the device, install the appropriate equipment and materials for the inspection and maintenance to provide for safe ways to achieve (see IEC 61241-17).
Related equipment 4.2 Non-hazardous locations
Should consider technical requirements for hazardous area equipment related equipment and installation requirements, except for non-related equipment in hazardous locations, for example, Paul
Protection devices, control devices, such as fuses.
4.3 Isolation
Only after a hazardous material was isolated in order to ensure that the final level of security. Electrical equipment, especially switches and controls, if available
OK, should normally be installed in non-hazardous locations.
The device can be installed in non-hazardous places outdoors, and can be isolated in the non-hazardous rooms in the isolation room or, in some cases, or install
Making equipment and hazardous locations separated after obstacle.
4.4 electrical rating
Electrical equipment and materials should be fixed within the electrical values installation, use and maintenance. These quotas include power, voltage, current, frequency, negative
Load and temperature.
4.5 Protection of mechanical damage and environmental hazards
All electrical equipment selection, installation should be adequate to withstand or prevent possible environmental impact and mechanical damage, resulting in material properties zone...
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