GB 12476.4-2010 PDF English
Search result: GB 12476.4-2010
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB 12476.4-2010 | English | 200 |
Add to Cart
|
0-9 seconds. Auto-delivery.
|
Electrical apparatus for use in the presence of combustible dust -- Part 4: Protection by intrinsic safety iD
| Obsolete |
PDF Preview: GB 12476.4-2010
GB 12476.4-2010: PDF in English 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 Ⅲ
Introduction Ⅳ
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 ⅡB 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 ⅡB 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 contact with explosive dust environment, it should assume its climb
Or test to be assessed under electrical distances and clearances 6.4 do not satisfy the conditions laid down.
Encapsulation shell structure and circumstances should be recorded in the final design documents (see Chapter 13).
Dust 6.2 Annihilation of the device temperature
6.2.1 General
No matter under what circumstances, dust atmospheres intrinsically safe equipment should be used wherever possible shell protection. This subsection applies to insurance without housing
Protection, and under normal operating conditions for an annihilation of dust devices such as temperature sensors or other measurement components. All temperatures shall be measured at the most
Adverse fault conditions, but do not consider the safety factor of current, voltage and power.
The following requirements apply to electrical equipment dust layer thickness of 5mm ignition temperature not lower than 210 ℃ dust used in the environment.
For potentiometers, the surface of the examination should be surface resistance elements, rather than the outer surface of the device. It should also be considered in the testing process
Installation potentiometer overall configuration, heat dissipation and cooling effect. Temperature measurement printed on the wire should be fed in line "iaD" respectively
Or "ibD" demanded current. If this causes the actual resistance of less than 10% of the printed wire resistance, then in 10% of the printed wiring resistance situation
Measured under the conditions.
6.2.2 Equipment and components temperature
If the device meets any of the following conditions are considered to be applied to completely obliterated or unable to control the thickness of the dust layer of dust environment.
a) matches the power dissipation of any part to meet the requirements of Table 2.
Table 2 allows the power dissipation member
Maximum ambient temperature/℃ 40 70 100
Allow power dissipation/mW 750 650 550
b) the nature of the environment exposed to dust or lost in the combustible dust, and the smoldering temperature of the dust layer is higher than 200 ℃ safety
Full circuit, if the contacts of power less than 750mW, the short-circuit current is less than 250mA, the temperature rise test is not required.
c) meet the standard equipment dust 6.2.3 annihilation test requirements. Meet the requirements of the equipment is considered to be at a predetermined maximum ring
At ambient temperature for any ignition temperature not lower than 210 ℃ of combustible dust.
6.2.3 Standard dust annihilation temperature test
Specific test conditions and requirements are still under discussion.
6.2.4 Equipment internal conductor
Shall comply with the provisions of GB 3836.4-2000 6.2.2.
6.2.5 Printed circuit conductors
6.2.3 shall comply with the provisions of GB 3836.4-2000.
6.2.6 No shell protection circuit
Direct contact with explosive dust atmospheres intrinsically safe circuit device should be at least test for spark ignition device to ⅡB
begging. In this case, we should assume that all clearances and creepage distances do not satisfy the requirements of 6.4.
6.3 device connected with an external circuit
6.3.1 Terminals
6.3.1 shall comply with the provisions of GB 3836.4-2000.
6.3.2 plugs and sockets
Shall comply with the provisions in GB 3836.4-2000 6.3.2.
6.3.3 resistors are used to limit the maximum energy supply external inductance to resistance ratio (Lo/Ro) is determined
6.3.3 shall comply with the provisions of GB 3836.4-2000.
6.3.4 permanently attached cable
Shall comply with the provisions in GB 3836.4-2000 6.3.4.
6.4 spacing
Shall comply with the provisions of 6.4 GB 3836.4-2000.
6.5 to prevent reverse polarity protection
Shall comply with the provisions of 6.5 GB 3836.4-2000.
6.6 grounding conductors, connections and terminals
Shall comply with the provisions in 6.6 of GB 3836.4-2000.
6.7 encapsulation is used to isolate the explosive environment
Shall comply with the provisions of 6.7 GB 3836.4-2000.
7 elements with intrinsic safety related
Rating 7.1
Shall comply with the provisions of 7.1 GB 3836.4-2000.
7.2 Internal connection device, plug and plate elements
Shall comply with the provisions in 7.2 of GB 3836.4-2000.
7.3 Fuse
Shall comply with the provisions of 7.3 GB 3836.4-2000.
7.4 cells and batteries
Shall comply with the provisions in 7.4 GB 3836.4-2000.
7.5 Semiconductor
Shall comply with the provisions in 7.5 of GB 3836.4-2000.
7.6 Failure of components and connections
Shall comply with the provisions of 7.6 GB 3836.4-2000.
7.7 piezoelectric device
Shall comply with the provisions in 7.7 of GB 3836.4-2000.
8 reliable components, reliable components and reliable connection
Shall comply with the provisions of GB 3836.4-2000 in Chapter 8.
9 barrier diode
Shall comply with the provisions of GB 3836.4-2000 in Chapter 9.
10 Type tests
10.1 Spark ignition test
For the test, it should meet GB 3836.4-2000 in groups of ⅡB equipment.
10.2 Temperature Test
Shall comply with the provisions in 10.5 GB 3836.4-2000.
10.3 Voltage test
Shall comply with the provisions in 10.6 GB 3836.4-2000.
10.4 Small component ignition test
Shall comply with the provisions of 10.7 GB 3836.4-2000.
10.5 Determination of imprecise regulations element parameters
Shall comply with the provisions of 10.8 GB 3836.4-2000.
10.6 Test cells and batteries
Shall comply with the provisions in 10.9 GB 3836.4-2000.
10.7 Mechanical tests
10.7.1 encapsulation compound
With a diameter of 6mm flat head metal coupon for encapsulation compound 30N perpendicular to the surface subjected to a force, and to maintain 10s. Encapsulation compound
Was not damaged, permanent deformation or displacement of the test bar is greater than 1mm.
When encapsulated presence of the complex free surface, in order to ensure the strength of the composite encapsulation, but also make it difficult to break should be (20 ± 10) ℃
Under the conditions of use of GB 3836.1-2000 Appendix G of the test device for encapsulation compound impact test. Under any condition,
The impact energy of not less than 2J.
After the test encapsulation compound should remain intact and no permanent deformation. Impervious surface tiny cracks can be ignored.
10.7.2 separator
10.10.2 shall conform to the provisions of GB 3836.4-2000.
10.8 piezoelectric device equipped with electrical test equipment
If any part of the device may be subject to external shocks during normal operation, it should GB 3836.1-2000 appendix test uses
Equipment, according to high-energy GB 3836.1-2000 prescribed under the conditions (20 ± 10) ℃ for impact test equipment and measuring pressure
The voltage across the device capacitance and electrical parts.
If the device contains a piezoelectric device is attached directly to the device to be protected to avoid the impact of external devices, it should follow the manufacturer's expected pressure
Electrical device installation plus the protective device after the test.
At the highest measured voltage, maximum stored energy of the piezoelectric crystal capacitance should not exceed 0.25mJ. When the electrical output from the piezoelectric device
Protection element (including the protection device) to limit the impact test should not damage the protective measures failure occurs.
When you need to take to protect the piezoelectric device to generate energy from external physical impact exceeds a predetermined value when the element is required to deal with fine
Section predetermined, and as special conditions for safe use, and by the symbol on the device X.
10.9 diode safety barriers and safety shunts type test
Shall comply with the provisions of 10.12 GB 3836.4-2000.
10.10 Cable pull test
Shall comply with the provisions of GB 3836.4-2000 in 10.13.
11 routine inspection and test
Shall comply with the provisions of GB 3836.4-2000 in Chapter 11.
12 logo
12.1 General
Intrinsically safe equipment and associated equipment should have at least IEC 61241-0.2004 and the requirements of this section 12.2 mark. Product Serial
No date or series of numbers can be used instead of the code, which is sufficient to ensure quality control traceability.
Note 1. The product serial number can be independent of the other flag.
For the association, markers or ExibD application ExiaD brackets.
If possible, they should have marked out all relevant parameters, such as Um, Li, Ci, Lo, Co.
Note 2. The standard signs and symbols in the file by GB 3836.4-2000 given in Chapter 3.
Consider the actual application, limit or do not use italics or footnote, and can be used in a simplified form, such as the use instead of Uo Uo.
12.2 connection flag
Connection of intrinsically safe apparatus and associated equipment, plugs and sockets and junction boxes should be clearly labeled and easy to distinguish. To use
The color of its logo, it should be light blue.
When a plug and socket connection between the different parts or equipment equipment for plugs and sockets of intrinsically safe circuits
It should be clearly identified. To use color to identify it, it should be light blue.
In addition, in order to make the whole system can achieve intrinsic safety, the right to respond adequately connection, detailed identification.
Note. In order to achieve the above object, you may need to increase the signs near the plug and socket at or adjacent. If you are clearly marked, you can use electrical equipment
label.
Flag examples.
a) independent of the nature of the security device
×××× Ltd.
3 type signal receiver
ExiaD20T135
-25 ℃ \u003cTa\u003c 50℃
Proof certificate number. ACBEx01 ****
SEQ ID NO. ××××
Intrinsically safe equipment b) equipment connected with the other
×× Ltd.
12 Inverter
ExibD21T120
Proof certificate number. ACBNo. Ex01 ****
Li. 10μH Ci. 1200pF
Ui. 28V Ii. 250mA
Pi. 1.3W
c) associated equipment
×× Ltd.
TYP4 type equipment
[ExibD]
Proof certificate number. ACBNo. Ex01 * ***.
Um. 250V Po. 0.9W
Io. 150mA Uo. 24V
Lo. 14.2mH Co. 0.93μF
13 files
Shall comply with the provisions of GB 3836.4-2000 in Chapter 13.
In addition, the document should provide maximum surface temperature of the equipment are measured and the maximum surface temperature, such as "in accordance with 6.2.3 cereal flour
Dust annihilation temperature test to obtain their maximum surface temperature of 135 ℃ ".
When the device is designed to exceed -20 ℃ ~ 40 ℃ ambient temperature range, the approved use of ambient temperature shall be noted in the file.
Device Class (iaD or ibD) should also be indicated.
Other equipment to ensure the safe use of the information you need should be included in the file.
Appendix A
(Normative)
GB 3836.4-2000 see Appendix B.
Appendix B
(Informative)
GB 3836.4-2000 see Appendix C.
Appendix C
(Normative)
GB 3836.4-2000 See Appendix D.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
|