1 Scope
This part of GB 3836 contains specific requirements for the construction and testing of electrical equipment with the type of protection flameproof enclosure "d", intended for use in explosive gas atmospheres.
This part supplements and modifies the general requirements of GB 3836.1-2010. Where a requirement of this part conflicts with a requirement of GB 3836.1-2010, the requirement of this part will take precedence.
Note: Equipment protection by flameproof enclosures "d" provides Equipment Protection Level (EPL) Gb. For further information, see Annex H.
2 Normative References
The following standards contain provisions which, through reference in this part of GB 3836, constitute provisions of this part. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this part are encouraged to study whether the latest edition of these documents is applicable. For undated references, the latest edition of the normative document is applicable to this part.
GB/T 197-2003 "General Purpose Metric Screw Threads-Tolerances" (ISO 965-l:1998, MOD)
GB 755-2008 "Rotating Electrical Machines-Rating and Performance" (IEC 60034-l:2004, IDT)
GB/T 2516-2003 "General Purpose Metric Screw Threads-Limit Devications" (ISO 965-3:1998, MOD)
GB 2893-2001 "Safety Colours" (neq ISO 3864:1984)
GB 2894-2008 "Safety Signs and Guideline for the Use"
GB/T 2900.35-2008 "Electrotechnical Terminology-Electrical Apparatus for Explosive Atmospheres"(IEC 60050(426):2008, IDT)
GB 3101-1993 "General Principles Concerning Quantities, Units and Symbols" (eqv ISO 31-0:1992)
GB 3836.1-2010 "Explosive Atmospheres-Part 1: Equipment-General Requirements" (IEC 60079-0:2007, MOD)
GB 3836.3-2010 "Explosive Atmospheres-Part 3: Equipment Protection by Increased Safety e" (IEC 60079-7:2006, IDT)
GB 3836.4-2010 "Explosive Atmospheres-Part 4: Equipment Protection by Intrinsic Safety "i"" (IEC 60079-11:2006, MOD)
GB 3836.11-2008 "Explosive Atmospheres-Part 11: Equipment Protection by Flameproof Enclosures d-Method of Test for Ascertainment of Maximum Experimental Safe Gap" (IEC 60079-1-l:2002, IDT)
GB 3836.15-2000 "Electrical Apparatus for Explosive Gas Atmospheres-Part 15: Electrical Installations in Hazardous Areas (Other than Mines) (eqv IEC 60079-14:1996)
GB/T 4207-2003 "Method for Determining the Comparative and the Proof Tracking Indices of Solid Insulating Materials under Moist Conditions" (IEC 60112:1979, IDT)
GB 4208-2008 "Degrees of Protection Provided by Enclosure (IP Code)" (IEC 60529:2001, IDT)
GB/T 5163-2006 "Sintered Metal Materials, excluding Hardmetals-Permeable Sintered Metal Materials-Determination of Density, Oil Content, and Open Porosity" (ISO 2738:1999, IDT)
GB/T 5169.16-2002 "Fire Hazard Testing for Electric and Electronic Products-Part 16: Test Flames-50W Horizontal and Vertical Flame Test Methods" (IEC 60695-11-10:1999, IDT)
GB/T 5249-1985 "Permeable Sintered Metal Materials-Determination of Bubble Test Pore Size" (eqv ISO 4003:1977)
GB/T 5250-1993 "Permeable Sintered Metal Materials-Determination of Fluid Permeability" (eqv ISO 4022:1987)
GB/T 8897.1-2003 "Primary Batteries-Part 1: General" (IEC 60086-1:2000, IDT)
GB 9364 "Miniature Fuses (All Parts)"(IEC 60127, IDT)
GB/T 13259-2005 "High Pressure Sodium Lamps" (neq IEC 60662:2002)
GB/T 15142-2002 "Ceneral Specificatoin for Vented Nickel-cadmium Prismatic Rechargeable Single Cells" (IEC 60623:1990, MOD)
GB/T 21098-2007 "Lamp Caps and Holders Together with Gauges for the Control of Safety and Interchangeability (All Parts) (IEC 60061, IDT)
GB/T 22084.1-2008 "Secondary Cells and Batteries Containing Alkaline or Other Non-acid Electrolytes-Portable Sealed Rechargeable Single Cells-Part 1: Nickel-cadmium" (IEC 61951-1:2003, IDT)
GB/T 22084.2-2008 "Secondary Cells and Batteries Containing Alkaline or Other Non-acid Electrolytes-Portable Sealed Rechargeable Single Cells-Part 2: Nickel-metal Hydride" (IEC 61951-2:2003, IDT)
ISO 185:1988 "Grey Cast Iron-Classification"
ANSI/ASME B1.20.1-1983(R2001) "Pipe Threads, General Purpose (Inch)"
3 Terms and Definitions
For the purposes of this part, the following terms and definitions, in addition to those given in GB 3836.1-2010, apply.
Note: Additional definitions applicable to explosive atmospheres can be found in GB/T 2900.35-2008.
3.1
Flameproof enclosure "d"
Enclosure in which the parts which can ignite an explosive gas atmosphere are placed and which can withstand the pressure developed during an internal explosion of an explosive mixture, and which prevents the transmission of the explosion to the explosive gas atmosphere formed by one or more gases or vapors.
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Equipment Grouping and Temperature Classification
5 Flameproof Joints
6 Cemented joints
7 Operating Rods
8 Supplementary Requirements for Shafts and Bearings
9 Light-transmitting Parts
10 Breathing and Draining Devices which Form Part of a Flameproof Enclosure
11 Fasteners, Associated Holes and Blanking Elements
12 Materials and Mechanical Strength of Enclosures-Materials inside the Enclosures
13 Entries for Flameproof Enclosures
14 Verification and Tests
15 Type Tests
16 Routine Tests
17 Switchgear for Group I
18 Lampholders and Lamp Caps
19 Non-metallic Enclosures and Non-metallic Parts of Enclosures
20 Marking
Annex A (Normative) Additional Requirements for Crimped Ribbon Elements and Multiple Screen Elements of Breathing and Draining Devices
Annex B (Normative) Additional Requirements for Elements, with Non-measurable Paths, of Breathing and Draining Devices
Annex C (Normative) Additional Requirements for Flameproof Entry Devices
Annex D (Normative) Empty Flameproof Enclosures as Ex Components
Annex E (Normative) Cells and Batteries Used in Flameproof "d" Enclosures
Annex F (Normative) Supplementary Provisions for Electrical Equipment of Group I
Annex G (Informative) Mechanical Properties for Screws and Nuts
Annex H (Informative) Introduction of an Alternative Risk Assessment Method Encompassing "equipment protection levels" for Ex Equipment
