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GB 12476.6-2010 English PDF

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GB 12476.6-2010: Electrical apparatus for use in the presence of combustible dust -- Part 6: Protection by encapsulation “mD”
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GB 12476.6-2010English919 Add to Cart 4 days [Need to translate] Electrical apparatus for use in the presence of combustible dust -- Part 6: Protection by encapsulation “mD” Obsolete GB 12476.6-2010

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Standard similar to GB 12476.6-2010

GB/T 20936.4   GB 12476.1   GB 12476.5   GB/T 20936.2   GB/T 19518.1   GB/T 22769   

Basic data

Standard ID GB 12476.6-2010 (GB12476.6-2010)
Description (Translated English) Electrical apparatus for use in the presence of combustible dust -- Part 6: Protection by encapsulation ��mD��
Sector / Industry National Standard
Classification of Chinese Standard K35
Classification of International Standard 29.260.20
Word Count Estimation 23,254
Date of Issue 2010-08-09
Date of Implementation 2011-08-01
Quoted Standard GB/T 1034-2008; GB/T 1408.1-2006; GB 3836.3-2010; GB 3836.4-2010; GB/T 8897.1-2003; GB 9364.1; GB 9364.2; GB 9364.3; GB 9364.4; GB 9364.6; GB 9816-2008; GB 12476.4-2010; GB/T 16855.1-2005; GB/T 16935.1-2008; GB 19212.7-2006; IEC 60285; IEC 60622; IEC 60664-1-1992; IEC 60664-1-1992/AMD 1-2000; IEC 60664-1-1992/AMD 2-2002; IEC 61150; IEC 61241-0-2004; IEC 61241-1-2004; IEC 61436; IEC 61960-1; IEC 62326-4-1; ANSI/UL 248-1; ANSI/UL 746B
Adopted Standard IEC 61241-18-2004, 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 applies to rated voltage not exceeding 10kV electrical equipment, electrical equipment parts and Ex components design, construction and test requirements, applicable to combustible dust using Encapsulation"mD"and limit the surface temperature protected electrical equipment,

GB 12476.6-2010: Electrical apparatus for use in the presence of combustible dust -- Part 6: Protection by encapsulation “mD”


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Electrical apparatus for use in the presence of combustible dust.Part 6. Protection by encapsulation "mD" ICS 29.260.20 K35 National Standards of People's Republic of China Combustible dust Electrical Equipment Part 6. protective encapsulation "mD" Part 6. Protectionbyencapsulation "mD" (IEC 61241-18.2004, 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

Preface Ⅰ Introduction Ⅱ 1 Scope 1 2 Normative references 1 3 Terms and definitions 2 4 General 3 Five pairs of complex claim 3 6 at 4 7 structural requirements 4 8 Type tests 12 9 routine inspection and test 15 10 15 Flag Appendix A (Informative Appendix) "mD" type device with a composite basic requirements 16 Appendix B (normative) sample allocation 17 Test procedures Annex C (normative) during a heat cycle test 18 Figure 1 from the free surface of the composite components or conductors between 7 Figure 2 from the shell wall or the free surface of the composite components or conductors between 7 8 from the wall or the free surface of the composite components or conductors between the shell 3 Minimum distance of 4 multi-layer printed circuit board 9 Figure A.1 "mD" type device with a composite basic requirements 16 Test Procedure Figure C.1 18 during thermal cycling test Table 1 through 6 of the composite pitch The thickness of the composite sheet 62 and the free surface of the composite components or conductors between Table 3 shell wall thickness or the free surface of the composite member or the complex between the conductors 7 Table 4 thickness of the shell wall or the free surface of the composite member or the composite conductor 8 Table 5 minimum distance of a multilayer printed circuit board 9 Table 6 allows the primary battery 10 Table 7 allows battery 10 Table 8 Test pressure 14 Table B.1 Sample Distribution 17

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 612 476, equivalent using IEC 61241-18.2004 "combustible dust Electrical apparatus Part 18. encapsulation type of protection "mD" "(in English). This part of IEC 61241-18.2004 was the following editorial changes. --- Remove the IEC 61241-18.2004 Foreword; --- Increase the national standard foreword. Appendix A of this section is informative annex; Appendix B, Appendix C is a normative 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, Huarong Group Co., Ltd., Changzhou Yuhua electronic Preparation Co., blast Electric Co., Ltd. The main drafters of this section. Shu North Korea, Li Jiang, Zhang Haiou, Zhou Jinliang, Liu Qi Ying.

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 to give adequate protection to reduce the 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. a method (whenever practicable) shall Electric 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, dust layer thickness and geometry of heat-related; --- 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. If the electrical equipment at its rated operating conditions, and in accordance with the appropriate procedures or requirements for the implementation of installation and maintenance, can prevent over power Flow and internal short circuit fault and other electrical fault, the protection method specified in this section will be able to achieve the required level of safety. especially important Is internal or external to the severity and duration of the fault limits can be maintained without damaging the value of the electrical equipment. Hazardous areas explosion-proof electrical equipment using several techniques. This section describes the type of encapsulation to protect the safety technical characteristics of the mining regulations 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. Combustible dust Electrical Equipment Part 6. protective encapsulation "mD"

1 Scope

This section should be used with GB 12476 General requirements. These requirements apply to encapsulation protection and surface temperature limitation of electrical equipment Equipment, except when otherwise specified. This section applies to combustible dust by Encapsulation "mD" protection and limit the surface temperature of the electrical equipment. In this environment In the presence of combustible dust quantity can cause a fire or explosion hazard. This section provides a rated voltage not exceeding 10kV electrical equipment Equipment, parts of electrical equipment and Ex design elements, construction and test requirements. Note 1. The actual operating voltage up to more than 10% of the predetermined value. Note 2. GB 12476.2 "combustible dust electrical equipment Part 2. Selection and installation" gives the selection and installation of electrical equipment Guide. Headquarters Points within a predetermined range of electrical equipment may also comply with other standards, such as GB 3836.1 "Explosive atmospheres - Part 1. General requirements for equipment" complement Filling requirements. Electrical equipment simultaneously or flammable gas and combustible dust environments are possible, increase the number of attached claim Plus protective measures. This section does not apply to those Explosives dust or spontaneously combustible materials can not require atmospheric oxygen for combustion. This section does not apply to gas and/or flammable coal dust caused by dangerous coal mine and mine surface installations electrical equipment. This part of the hazards of combustible dust comes out or not considered due to toxic gas. This section does not include other types of protection, applies only Encapsulation.

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/T 1034-2008 Plastics Determination of water absorption (ISO 62.2008, IDT) GB/T 1408.1-2006 electrical insulating materials strength test methods - Part 1. Tests at power frequencies (IEC 60243-1.1998, IDT) GB 3836.3-2010 explosive atmospheres - Part 3. the increased safety "e" protection equipment (IEC 60079-7.2006, IDT) GB 3836.4-2010 Explosive atmospheres - Part 4. the intrinsically safe "i" protection equipment (IEC 60079-11.2006, IDT) GB/T 8897.1-2003 Primary batteries - Part 1. General (IEC 60086-1.2000, IDT) GB 9364 (all parts) miniature fuses (IEC 60127 series, IDT) 1) coming into national standards. GB 12476.1 "combustible dust Electrical Equipment Part 1. General requirements" (IEC 61241-0.2004, MOD). GB Requirements and application guide for the 9816-2008 thermal fuse (IEC 60691.2002 A1.2006, IDT) GB 12476.4-2010 combustible dust electrical equipment Part 4. Intrinsic safety "iD" (IEC 61241-11. 2005, IDT) GB/T 16855.1-2005 Safety of machinery - Safety-related control system components - Part 1. General principles for design (ISO 13849-1. 1999, MOD) GB/T 16935.1-2008 within low-voltage systems Insulation coordination for equipment - Part 1. Principles, requirements and tests (IEC 60664-1. 2007, IDT) Part 7 GB 19212.7-2006 Safety of power transformers, power supply units and similar products. general purpose safety isolating transformer Particular requirements for the pressure (IEC 61558-2-6.1997, MOD) IEC 60285 alkaline storage battery. sealed cylindrical rechargeable nickel - cadmium battery monomer IEC 60622 alkaline or acidic electrolyte batteries. sealed prismatic rechargeable nickel - cadmium battery monomer IEC 60664-1.1992 within low-voltage systems Insulation coordination for equipment - Part 1. Principles, requirements and tests Amendments No. 1 (2000) No. 2 amendments (2002) IEC 61150 alkaline storage battery. cadmium sealed rechargeable Nickel - cell battery button cell design 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 61436 alkaline or acidic electrolyte batteries. sealed rechargeable nickel - metal hydride battery single monomer IEC 61960-1 portable lithium batteries - Part 1. Lithium batteries IEC 62326-4-1 Printed circuit boards - Part 4. Rigid multilayer circuit boards with interlayer connections - Sectional specification Chapter 1. Performance Details Specification performance level A, B and C ANSI/UL248-1 standard low-voltage fuses - Part 1. General requirements ANSI/UL746B polymeric materials. lasting performance evaluation

3 Terms and Definitions

This section uses the following type of protection encapsulation "mD" special terms and definitions, which is required to give general definitions supplement. 3.1 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. 3.2 Complex compounds Thermoset, thermoplastic or epoxy resin, without fillers and/or cured state elastic material additives. 3.3 Composite temperature range temperaturerangeofthecompound Whether running or storage properties of the composite can meet the requirements of this temperature range. 3.4 Continuous operating temperature composites (COT) continuousoperatingtemperature (COT) ofthecompound The complex of the manufacturer's data, the device is expected to run over the life cycle, the composite can meet the requirements of this temperature range. 3.5 Encapsulation encapsulation Using suitable means of enclosing the electrical device with a composite process. 3.6 Free surface freesurface Exposed to the surface of the composite explosive environment. 3.7 Running normaloperation Electrical equipment and mechanical aspects of the operation in compliance with its design specification and use within the limits specified by the manufacturer. Note 1. The restrictions can include continuous operating conditions, such as motor duty cycle operation specified by the manufacturer. Note 2. within the specified limits, the power of change and some other operations are normal tolerance operation. 3.8 Void void Encapsulation process unintentionally produced space. 3.9 Net space freespace Interested element or elements of the space surrounding the interior space design. 3.10 Switch contacts switchingcontact For mechanical contact turns on and off the circuit.

4 General

4.1 Equipment classification and temperature class "MD" type equipment shall be in accordance IEC 61241-0.2004 requirements in Chapter 5 are grouped. 4.2 Degree of protection Dust Encapsulation "mD" electrical equipment should be split into "maD" level of protection or "mbD" level of protection. Unless otherwise stated, the requirements of this section apply to both protection. If you use a non-automatic reset protection in line with GB 9364 or GB 9816-2008 means of protection, both for the protection of Level, only one protective device can be. 4.3 "maD" level of protection In each of the following conditions, "maD" level of protection should not cause ignition device. a) normal operation and installation; b) any exceptions specified conditions; c) provision of fault conditions. For "maD" level of protection, encapsulation circuit at any point should not exceed the operating voltage of 1kV. For "maD" level of protection, only when the element is destroying the mechanical or thermal equipment fault condition will only be taken to deal with them attached Plus protection. Alternatively, when the temperature of the internal components of a fault may lead to increased so the encapsulation system failure, it shall meet the requirements of 6.2. Note. In accordance with the section "mbD" level of protection required to allow the use of some of the elements, as a result of internal effects to produce mechanical or thermal damage makes insurance Protective measures "encapsulation" failure. For "maD" level of protection of the equipment, the risk should be excluded. 4.4 "mbD" level of protection In each of the following conditions, "mbD" level of protection should not cause ignition device. a) normal operation and installation; b) provision of fault conditions. 4.5 Power Requirements Should be specified power limits (rated voltage and the expected short-circuit current) as to ensure that, under the relevant "maD" or "mbD" level of protection Limiting the temperature. Protective device used shall meet the requirements of 7.7. Five pairs of complex requirements 5.1 General Compliance with IEC 61241-0. composite and process for encapsulation of documents shall specify the requirements of 23.2 in 2004 used. It should provide at least characteristic for Encapsulation "mD" of the complex. Select the encapsulation material should be made to consider appropriate to allow normal operations and allow failure occurs when the composite deformation. 5.2 Technical Description The manufacturer shall ensure that materials meet the complex technical description of responsibility. Technical description shall include. a) composite manufacturer's name and address; b) Information materials should be accurate and complete, if you include fillers and other additives, the percentage should be indicated, and the mixture ratio Grades; c) if applicable, any surface treatment method of compound, such as paint; d) if applicable, the element is correct so that the composite adhesive, pretreatment requirements for components, such as cleaning, pickling; e) If applicable, the results of the test in accordance with the requirements of 8.1 water absorption tests. As no water absorption test, the device shall root According to IEC 61241-0.2004 is 29.2 i) mark symbol "X", indicates special conditions; f) In the device according to the highest temperature measured 8.2.2, GB/T 1408.1-2006 prescribed Dielectric strength; g) composite temperature range (continuous operation of the upper and lower temperature); h) For "mD" type device, in the case where the complex is part of the housing, IEC 61241-0.2004 in the item 6.1.2 d) a predetermined Defined temperature index TI. As an alternative to TI, but also according to ANSI/UL746B "polymeric materials. long-term performance Evaluation "to determine the relative thermal index (RTI- mechanical impact); i) When the color changes will affect the performance of the composite, used as a color composite test sample.

6 Temperature

6.1 General During normal operation, the temperature should not exceed the maximum allowable surface temperature and the maximum temperature of the composite of continuous operation. "MD" type Equipment should take protective measures to make under specified fault conditions, pouring "mD" type sealing device is not affected. 6.2 Temperature Limit When security considerations require the use of protective devices is defined based on the temperature, protection device shall be an internal or external, non-electric or thermal self Fixed reset means. "MbD" level of protection requires a protective device, "maD" level of protection requires two protection devices. Protective devices are Should be sufficient thermal coupling between the monitoring component. For functional reasons, "mD" type device can also install an additional automatic reset protection Means. If the non-automatic reset protection in line with GB 9364 or GB 9816-2008, then for "maD" and "mbD" two protection rating Only a protection device. When the device may malfunction (see 7.2.1), or the possibility of the existence of the temperature rise, for example, according to the negative input voltage 7.2.1 Or unsuitable load should be considered to determine the limiting temperature. 6.3 Determination of temperature extremes 6.3.1 The maximum surface temperature The maximum surface temperature should be based on supply conditions specified in 4.5, 8.2.2 Test Method using a predetermined measurement. 6.3.2 temperature composite parts It should be measured hottest parts. Near the hottest part of the compound to be used in the maximum temperature specified in 8.2.2 for the normal operation of the test Test method for the determination. Note. You can determine the hottest part by calculation or consult the manufacturer's technical instructions or pouring closure member before the actual test.

7 structural requirements

7.1 General When encapsulation is part of the outside of the housing, it shall meet on the metallic parts of non-metallic enclosures and housing requirements. If the user needs to meet the requirements of this secondary protective measures such as supplementary mechanical protection should be in accordance with IEC 61241-0.2004's 29.2 i) the equipment plus an "X", and provide the necessary instructions. Shall take appropriate measures to adjust the components produce expansion phenomenon in the failure of normal operation and 7.2 appears. 7.2 to 7.7, the composite was whether to adhere to the shell have different requirements. The purpose of bonding is to prevent combustible dust and tide Gas into the interface (such as. the interface shell and complex, complex and not fully embedded in composite components such as printed circuit boards and terminals Like interface). If you require additional processing to ensure that the interface bonding, the claim should be written in the manufacturer's documents. If the bonding required to maintain the type of protection, it has completed all the requirements of the test after bonding type of protection should be kept intact. Note. The specific application of complex choices and each complex role related. Typically, the composite was subjected to a test does not meet the encapsulation "mD" of Full application. 7.2 determine the possible faults 7.2.1 troubleshooting Even in unfavorable input condition (but between 90% and 110% of rated parameter) and unfavorable output load and of any internal electrical Fault (for "maD" level of protection for the two failures, for "mbD" level of protection as a fault) case, should ensure encapsulated explosion Properties, such as occurs in the following situations. --- Means a short circuit; --- Component failure; --- Printed circuits fail. Reliable components and reliable isolation distance should not be regarded as failure. If a failure causes one or more subsequent faults, for example, as part overload, the initial failure and subsequent failures should be considered To be a failure. 7.2.2 reliable member The following components are encapsulated by the requirements of this part, when its run at the specified temperature range, and does not exceed the manufacturer's specification for each part 2/3 rated voltage, rated current and rated power shall be deemed to be reliable. ● resistors, if they comply with the relevant provisions of GB 3836.4-2010; ● single helical coil windings; ● plastic metal foil capacitors; ● Paper capacitors; ● ceramic capacitors; ● semiconductors, if used according to the requirements of GB 3836.4-2010. When the semiconductor device limits the current applied to a single device "mbD" level of protection, two means are adapted to "maD" level of protection. Note. The nature of the provisions in GB 12476.4 band "iaD" safe level of protection devices require the contrary, there is no need to ban the use of active semiconductor regulating Circuit, because the impact of short-term fluctuations on the transient encapsulated devices is negligible. The following isolate different parts of the circuit should be considered reliable. a) Optocouplers and relays, if the rated insulation compressive strength in line with (2U 1000V) or 1500V (ac), taken between Large value, (U for the two circuits rated voltage and rms); b) meet the requirements of GB 12476.4-2010 GB 19212.7-2006 or transformer; c) comply with the requirements of GB 3836.3-2010 coils, transformers and motor windings, comprising a guide diameter of less than 0.25mm Line, if they can prevent the internal temperature is not allowed, is considered to be reliable. 7.2.3 reliable isolation distance Exposed live parts if the distance between one of the following conditions occur in line with the requirements of 7.2.3.1, it is not necessary to consider the occurrence of Voltage breakdown of the possibility of failure 7.2.1 and 7.2.3.2 also applies to a case of. --- The same circuit; or --- Circuit and grounded metal parts; or --- Two independent circuits (voltage and voltage as shown in Table 1; as a voltage less than 20% of another voltage, this voltage Ignorable). 7.2.3.1 By spacing composite If prior to encapsulation mechanical installation spacing values in accordance with Table 1, it shall be considered by the separation distance of the complex to be reliable. Table 1 through the composite pitch Voltage U (rms or dc) (see Note) Minimum spacing mm ≤63 0.5 ≤400 1 ≤500 1.5 ≤630 2 ≤1000 2.5 ≤1600 4 ≤3200 7 ≤6300 12 ≤10000 20 Note. The voltage shown from GB/T 16935.1-2008. For all voltages, the actual working voltage may be greater than 10 percent of...

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