GB 12476.4-2010: Electrical apparatus for use in the presence of combustible dust -- Part 4: Protection by intrinsic safety iD

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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.

Basic Data

Standard ID	GB 12476.4-2010 (GB12476.4-2010)
Description (Translated English)	Electrical apparatus for use in the presence of combustible dust -- Part 4: Protection by intrinsic safety iD
Sector / Industry	National Standard
Classification of Chinese Standard	K35
Classification of International Standard	29.260.20
Word Count Estimation	13,173
Date of Issue	2010-08-09
Date of Implementation	2011-08-01
Quoted Standard	GB 3836.1-2000; GB 3836.4-2000; GB 3836.18-2010; GB 4208-2008; IEC 61241-0-2004; IEC 61241-1-2004
Adopted Standard	IEC 61241-11-2005, 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 circuit which does not cause peripheral electrical explosion of combustible dust.