GB 12476.1-2013 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 12476.1-2013 | English | 430 |
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Electrical apparatus for use in the presence of combustible dust -- Part 1: General requirements
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| GB 12476.1-2000 | English | 999 |
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Electrical apparatus for use in the presence of combustible dust--Part 1-1: Electrical apparatus protected by enclosures and surface temperature limitation-Specification for apparatus
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| GB 12476.1-1990 | English | RFQ |
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Electrical apparatus for explosive dust atmosphere--Dust ignition-proof apparatus
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GB 12476.1-2013: Electrical apparatus for use in the presence of combustible dust -- Part 1: General requirements
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
K 35
Replacing GB 12476.1-2000
Electrical Apparatus for Use in the Presence of
Combustible Dust – Part 1.General Requirements
(IEC 61241-0.2004.MOD)
Issued on. DECEMBER 17, 2013
Implemented on. NOVEMBER 14, 2014
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 4
Introduction... 6
1 Scope... 8
2 Normative References... 9
3 Terms and Definitions... 11
4 Construction... 16
5 Temperatures... 18
6 Enclosure Materials... 19
7 Fasteners... 21
8 Interlocking Devices... 21
9 Bushings... 21
10 Materials Used for Cementing... 22
11 Ex Components... 22
12 Connection Facilities and Terminal Compartments... 23
13 Connection Facilities for Earthing or Bonding Conductors... 24
14 Cable and Conduit Entries... 25
15 Radiating Equipment... 27
16 Supplementary Requirements for Specific Electrical Apparatus – Rotating
Electrical Machines... 28
17 Switchgear... 29
18 Fuses... 30
19 Plugs and Sockets... 30
20 Luminaires... 33
21 Caplights, Caplamps and Handlamps... 34
22 Apparatus Incorporating Cells and Batteries... 34
23 Type Verification and Tests... 36
24 Routine Verifications and Tests... 44
25 Manufacturer’s Responsibility... 45
26 Verifications and Tests on Modified or Repaired Electrical Apparatus... 45
27 Clamping Tests of Cable Entries for Non-Armored and Braided Cables... 45
28 Clamping Tests of Cable Entries for Armored Cables... 48
29 Marking... 49
30 Examples of Marking... 51
Appendix A (Normative) Inspection Procedures for Obtaining the Explosion-
Proof Certificate... 54
Foreword
All the technical contents in this Part are mandatory.
GB 12476 consists of the following parts under the general title Electrical Apparatus
for Use in the Presence of Combustible Dust.
--- Part 1.General Requirements;
--- Part 2.Selection and Installation;
--- Part 3.Classification of Areas where Combustible Dusts are or May be Present;
--- Part 4.Protection by Intrinsic Safety “iD”;
--- Part 5.Protection by Enclosures “tD”;
--- Part 6.Protection by Encapsulation “mD”;
--- Part 7.Type of Protection “pD”;
--- Part 8.Test Methods – Methods for Determining the Minimum Ignition
Temperature of Dust;
--- Part 9.Test Methods – Methods for Determining the Electrical Resistivity of Dust
in Layers;
--- Part 10.Test Methods – Methods for Determining Minimum Ignition Energy of
Dust/Air Mixtures.
This Part is Part 1 of GB 12476.
This Part was drafted as per the rules specified in GB/T 1.1-2009.
This Part uses re-drafting method to modify and adopt IEC 61241-0.2004 Electrical
Apparatus for Use in the Presence of Combustible Dust – Part 0.General
Requirements (English Edition I). However, this Part is not the modification in a full
meaning of GB 12476.1-2000.The major technical contents of GB 12476.1-2000 are
replaced by GB 12476.5-2013 Electrical Apparatus for Use in the Presence of
Combustible Dust – Part 5.Protection by Enclosures “tD”.
Technically, this Part has the following technical differences and causes with IEC
61241-0.2004.
--- Taking into account the difference BETWEEN the type approval of the inspection
and certification of explosion-proof electrical equipment in China AND the IEC
international standard (there is no provision on the approval procedure), the type
approval procedure for explosion-proof electrical equipment in China is the
explosion-proof certification system. Therefore, the inspection procedure for
obtaining the explosion-proof certificate has been added to any Clause on
manufacturer’s responsibility, see Appendix A.
This Part was proposed by China Electrical Equipment Industrial Association.
This Part shall be under the jurisdiction of National Technical Committee for
Standardization of Explosion Protected Electrical Apparatus (SAC/TC 9).
Drafting organizations of this Part. Nanyang Explosion Protected Electrical Apparatus
Research Institute; and China National Quality Supervision and Test Center for
Explosion Protected Electrical Products.
Chief drafting organizations of this Part. CZ Explosion-Proof Electrical Appliances Co.,
Ltd.; Dianguang Explosion-Proof Technology Co., Ltd.; Warom Group Co., Ltd.;
Nanyang Explosion Protection Group Co., Ltd.; Xinliming Explosion Prevention Electric
Appliances Co., Ltd.; Shanghai Baolin Explosion-Proof Electric Co., Ltd.; and Zhejiang
Chuangxin Electric Machine Co., Ltd.
Chief drafting staffs of this Part. Wu Jianguo, Huang Jianfeng, Shi Xiaoxian, Li Jiang,
Bai Zhaohao, Zheng Zhenxiao, Wen Zhenke, Li Shuchao, and Chen Rui.
The historical edition replaced by this Standard is as follows.
--- GB 12476.1-2000.
1 Scope
This Part of GB 12476 specifies general requirements for the design, construction,
testing and marking of electrical apparatus protected by any recognized safeguard
technique for use in areas where combustible dust may be present in quantities that
could lead to a fire or explosion hazard.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 70.1-2008 Hexagon Socket Head Cap Screws (ISO 4762.2004, MOD)
GB/T 1040.2-2006 Plastics - Determination of Tensile Properties - Part 2.Test
Conditions for Molding and Extrusion Plastics (ISO 527-2.1993, IDT)
3 Terms and Definitions
For the purposes of this Part, the following terms and definitions apply.
Dust, fibers or flying that can burn or glow in air and could form explosive mixtures with
air at atmospheric pressure and normal temperatures.
Mixture with air, under atmospheric conditions, of flammable substances in the form of
dust, fibers or flying in which, after ignition, combustion spreads throughout the
unconsumed mixture.
4 Construction
Electrical apparatus for use in potentially explosive dust atmospheres shall comply with
the requirements of this standard.
Enclosures for use in Zone 20 or 21 which can be opened more quickly than the time
necessary.
5 Temperatures
For electrical apparatus, the maximum surface temperature shall be specified in
relevant documentation according to 23.2.
In addition to the maximum surface temperature required in 5.1, the maximum surface
temperature may be stated for a given depth of layer, TL, of dust surrounding all sides
of the apparatus, unless otherwise specified in the documentation, and marked
according to 29.2.1h).
6 Enclosure Materials
The following requirements apply to non-metallic enclosures and non-metallic parts of
enclosures on which the type of protection depends.
Materials used in the construction of enclosures of electrical apparatus to be used in
explosive dust atmospheres shall not contain, by weight, more that 7.5 % in total of
magnesium and titanium.
Threaded holes in enclosures for fasteners which secure covers intended to be opened
in service for adjustment, inspection and other operational reasons may only be tapped
in the material of the enclosure when the thread form is compatible with the material
used for the enclosure.
7 Fasteners
Parts necessary to achieve a standard type of protection or used to prevent access to
uninsulated live parts shall be capable of being released or removed only with the aid
of a tool.
Fastening screws for enclosures of materials containing light metals may be made of
light metal or plastics if the material of the fastener is compatible with that of the
enclosure.
8 Interlocking Devices
Interlocking devices used to maintain a type of protection shall be so constructed that
their effectiveness cannot readily be defeated by the use, for example, of a screwdriver
or pliers.
9 Bushings
Bushings in enclosures used as connection facilities and which may be subjected to a
torque while the connection or disconnection is being made shall be mounted in such
a way that all parts are secured against turning.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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