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GB 3836.8-2014 English Version, GB 3836.8-2014 Explosive atmospheres―Part 8:Equipment protection by type of protection “n” (English Version) - Code of China
Position: Chinese Standard in English/GB 3836.8-2014
GB 3836.8-2014 Explosive atmospheres―Part 8:Equipment protection by type of protection “n” (English Version)
Standard No.: GB 3836.8-2014 Status: valid remind me the status change
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Detail of GB 3836.8-2014
Introduction of GB 3836.8-2014
Contents of GB 3836.8-2014
Standard No.: GB 3836.8-2014
English Name: Explosive atmospheres―Part 8:Equipment protection by type of protection “n”
Chinese Name: 爆炸性环境 第8部分: 由n型保护的设备
Superseding: GB 3836.8-2003 Electrical apparatus for explosive gas atmospheres?Part 8:Type of protection “n”
1 Scope This part of GB 3836 specifies requirements for the construction, testing and marking for Group II electrical equipment with type of protection, "n" intended for use in explosive gas atmospheres. This part applies to electrical equipment where the rated voltage does not exceed 15 kV r.m.s. a.c. or d.c. This part of GB 3836 is applicable to non-sparking electrical equipment and also to electrical equipment with parts or circuits producing arcs or sparks or having hot surfaces which, if not protected in one of the ways specified in this standard, could be capable of igniting a surrounding explosive gas atmosphere. This standard describes several different methods by which this can be achieved which may be combined with other methods described in GB 3836.1-2010. This standard supplements and modifies the general requirements of GB 3836.1-2010, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of GB 3836.1-2010, the requirement of this standard takes precedence. Table 1 Relationship of This Part to GB 3836.1-2010 Clause of GB 3836.1-2010	GB 3836.1-2010 clause application to GB 3836.8 GB 3836.1-2010 (informative)	Clause / Subclause title (normative)	Protected sparking nC	Non sparking nA	Restricted breathing nR 4	Equipment grouping	Applies	Applies	Applies 4.1	Group I	Excluded	Excluded	Excluded 4.2	Group II	Applies	Applies	Applies 4.3	Group III	Excluded	Excluded	Excluded 4.4	Equipment for a particular explosive atmosphere	Applies	Applies	Applies 5.1	Environmental influences	Applies	Applies	Applies 5.1.1	Ambient temperature	Applies	Applies	Applies 5.1.2	External source of heating or cooling	Applies	Applies	Applies 5.2	Service temperature	Applies	Applies	Applies 5.3.1	Determination of maximum surface temperature	Applies	Applies	Applies 5.3.2.1	Group I electrical equipment	Excluded	Excluded	Excluded 5.3.2.2	Group II electrical equipment	Applies	Applies	Applies 5.3.2.3	Group III electrical equipment	Excluded	Excluded	Excluded 5.3.3	Small component temperature for Group I and Group II electrical equipment	Applies	Applies	Excluded 6.1	General	Applies	Applies	Applies 6.2	Mechanical strength	Applies	Applies	Applies 6.3	Opening times	Excluded	Excluded	Applies 6.4	Circulating currents	Applies	Applies	Applies 6.5	Gasket retention	Applies	Applies	Applies 6.6	Electromagnetic and ultrasonic radiating equipment	Applies	Applies	Applies 7.1.1	Applicability	Applies	Applies	Applies 7.1.2	Specification of materials	Applies	Applies	Applies 7.1.3	Plastic materials	Applies	Applies	Applies 7.1.4	Elastomeric materials	Applies	Applies	Applies 7.2	Thermal endurance	Applies	Applies	Applies 7.3	Resistance to light	Applies	Applies	Applies 7.4	Electrostatic charges on external non-metallic materials	Applies	Applies	Applies 7.5	Threaded holes	Applies	Applies	Applies 8.1.1	Group I	Excluded	Excluded	Excluded 8.1.2	Group II	Applies	Applies	Applies 8.1.3	Group III	Excluded	Excluded	Excluded 8.2	Threaded holes	Applies	Applies	Applies 9.1	General	Applies	Applies	Applies 9.2	Special fasteners	Excluded	Excluded	Excluded 9.3	Holes for special fasteners	Excluded	Excluded	Excluded 10	Interlocking devices	Excluded	Excluded	Excluded 11	Bushings	Applies	Applies	Applies 12	Materials used for cementing	Modified	Modified	Modified 13	Ex components	Applies	Applies	Applies 14	Connection facilities and termination compartments	Modified	Modified	Modified 15	Connection facilities for earthing and bonding conductors	Applies	Applies	Applies 16	Entries into enclosures	Applies	Applies	Applies 17	Supplementary requirements for rotating electrical machines	Excluded	Modified	Excluded 18	Supplementary requirements for switchgear	Applies	Applies	Applies 19	Supplementary requirements for fuses	Modified	Modified	Modified 20	Supplementary requirements for plugs and sockets	Modified	Modified	Modified 21	Supplementary requirements for luminaires	Modified	Modified	Modified 22	Supplementary requirements for caplights and handlights	Applies	Applies	Applies 23	Equipment incorporating cells and batteries	Modified	Modified	Modified 24	Documentation	Applies	Applies	Applies 25	Compliance of prototype or sample with documents	Applies	Applies	Applies 26.1	General	Applies	Applies	Applies 26.2	Test configuration	Applies	Applies	Applies 26.3	Tests in explosive test mixtures	Applies	Applies	Applies 26.4	Tests of enclosures	Applies	Applies	Applies 26.4.1.1	Metallic enclosures, metallic parts of enclosures and glass parts of enclosures	Applies	Applies	Applies 26.4.1.2.1	Group I electrical equipment	Excluded	Excluded	Excluded 26.4.1.2.2	Group II and Group III electrical equipment	Applies	Applies	Applies 26.4.2	Resistance to impact	Applies	Applies	Applies 26.4.3	Drop test	Applies	Applies	Applies 26.4.4	Acceptance criteria	Applies	Applies	Applies 26.4.5	Degree of protection by enclosure	Applies	Applies	Applies 26.5	Thermal tests	Applies	Applies	Applies 26.6	Torque test for bushings	Applies	Applies	Applies 26.7	Non-metallic enclosures or non-metallic parts of enclosures	Modified	Modified	Modified 26.8	Thermal endurance to heat	Modified	Modified	Modified 26.9	Thermal endurance to cold	Applies	Applies	Applies 26.10	Resistance to light	Applies	Applies	Applies 26.11	Resistance to chemical agents for Group I electrical equipment	Excluded	Excluded	Excluded 26.12	Earth continuity	Applies	Applies	Applies 26.13	Surface resistance test of parts of enclosures of non-metallic materials	Applies	Applies	Applies 26.14	Charging tests	Applies	Applies	Applies 26.15	Measurement of capacitance	Applies	Applies	Applies 27	Routine tests	Applies	Applies	Applies 28	Manufacturers responsibility	Applies	Applies	Applies 29	Marking	Applies	Applies	Applies 30	Instructions	Applies	Applies	Applies Annex A	Supplementary requirements for Ex cable glands	Applies	Applies	Applies Annex B	Requirements for Ex components	Applies	Applies	Applies Annex G	Example of rig for resistance to impact test	Applies	Applies	Applies Annex E	Introduction to an alternative risk assessment method encompassing “equipment protection levels” fro Ex equipment	Applies	Applies	Applies Applies : this requirement of GB 3836.1-2010 is applied without change. Excluded : this requirement of GB 3836.1-2010 does not apply. Modified : this requirement of GB 3836.1-2010 is modified as detailed in this standard. Note 1:	The clause number in the above table is shown for information only. The applicable requirements of GB 3836.1-2010 are identified by the clause title which is normative. This document was written against the specific requirements of GB 3836.1-2010). The clause numbers for the previous edition are shown for information only. This is to enable the General Requirements GB 3836.1-2010) to be used where necessary with this part. Note 2:	A non-incendive component is limited in use to the particular circuit for which it has been shown to be non-ignition capable and, therefore, cannot be separately assessed as complying with this standard. Note 3:	Compliance with this standard does not imply any removal of, or lowering of the requirements of any other standard with which the electrical equipment complies. Note 4:	This part supplements, and may enhance, the requirements for equipment for normal industrial applications. Where compliance with other IEC standards is indicated, such as GB 755-2008 for motors and GB 7000 for luminaires, proving compliance to those standards is normally the responsibility of the manufacturer. Note 5:	Type of protection “n” provides Equipment Protection Level (EPL) Gc. For further information, see GB 3836.1-2010. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB 755-2008	Rotating Electrical Machines — Rating and Performance (IEC 60034-1:2004, IDT) GB 1312-2007	Lampholders for Tubular Fluorescent Lamps and Starter Holders (IEC 60400:2004, IDT) GB/T 1406.1-2008	Types and Dimensions of Lamp Caps — Part 1: Screw Caps (IEC 60061-1:2005, MOD) GB/T 1406.2-2008	Types and Dimensions of Lamp Caps — Part 2: Pin Lamp Caps (IEC 60061-1:2005, MOD) GB/T 1406.3-2008	Types and Dimensions of Lamp Caps — Part 3: Prefocus Caps (IEC 60061-1:2005, MOD) GB/T 1406.4-2008	Types and Dimensions of Lamp Caps — Part 4: Miscellaneous Caps (IEC 60061-1:2005, MOD) GB/T 1406.5-2008	Types and Dimensions of Lamp Caps — Part 5: Bayonet Caps (IEC 60061-1:2005, MOD) GB/T 2423.5-1995	Environmental Testing for Electric and Electronic Products — Part 2: Test Methods — Test Ea and Guidance: Shock (idt IEC 60068-2-27:1987) GB 3836.1-2010	Explosive Atmospheres — Part 1: Equipment — General Requirements (IEC 60079-0:2007, MOD) GB 3836.2-2010	Explosive Atmospheres — Part 2: Equipment Protection by Fameproof Enclosures “d” (IEC 60079-1:2007, 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 3836.9-2014	Explosive Atmospheres — Part 9: Equipment Protection by Type of Protection “m” (IEC 60079-18:2009, MOD) GB 3836.16-2006	Explosive Atmospheres — Part 16: Electrical Installations Inspection and Maintenance (IEC 60079-17:2002, IDT) GB/T 3956-2008	Conductors of Insulated Cables (IEC 60228:2004, IDT) GB/T 4207-2012	Method for the Determination of the Proof and the Comparative Tracking Indices of Solid Insulating Materials (IEC 60112:2009, IDT) GB 4208-2008	Degrees of Protection Provided by Enclosure (IP Code) (IEC 60529:2001, IDT) GB 7000 (all parts)	Luminaires GB 7000.1-2007	Luminaires — Part 1: General Requirements and Tests (IEC 60598-1:2003, IDT) GB 13140.5-2008	Connecting Devices for Low-voltage Circuits for Household and Similar Purposes — Part 2: Particular Requirements for Twist-on Connecting Devices (IEC 60998-2-4:2004, IDT) GB 13539.3-2008	Low-voltage Fuses — Part 3: Supplementary Requirements for Fuses for Use by Unskilled Persons (Fuses Mainly for Household and Similar Applications) — Examples of Standardized Systems of Fuses A to F (IEC 60269-3:2006, IDT) GB/T 14048.7-2006	Low-voltage Switchgear and Controlgear — Part 7-1: Ancillary Equipment — Terminal blocks for Copper Conductors (IEC 60947-7-1:2002, MOD) GB/T 14048.8-2006	Low-voltage Switchgear and Controlgear — Part 7-2: Ancillary Equipmentr — Protective Conductor Terminal Blocks for Copper Conductors (IEC 60947-7-2:2002, MOD) GB/T 16935.1-2008	Insulation Coordination for Equipment within Low-voltage Systems — Part 1: Principles, Requirements and Tests (IEC 60664-1:2007, IDT) GB 17464-2012	Connecting Devices — Electrical Copper Conductors — Safety Requirements for Screw-type and Screwless-type Clamping Units — Part 1: General Requirements and Particular Requirements for Clamping Units for Conductors from 0.2 mm2 up to 35 mm2 (Included) (IEC 60999-1:1999, IDT) GB 17935-2007	Edison Screw Lampholders (IEC 60238:2004, IDT) GB 17936-2007	Bayonet Lampholders (IEC 61184:2004, IDT) GB 18489-2008	Capacitors for Use in Tubular Fluorescent and Other Discharge Lamp Circuits — General and Safety Requirements (IEC 61048-2006, IDT) GB 18774-2002	Double-capped Fluorescent Lamps — Safety Specifications (idt IEC 61195:1999) GB 19510.1-2009	Lamp Controlgear — Part 1: General and Safety Requirements (IEC 61347-1:2007, IDT) GB 19510.2-2009	Lamp Controlgear — Part 2: Particular Requirements for Starting Devices (Other Than Glow Starters) (IEC 61347-2-1:2006, IDT) GB 19510.3-2009	Lamp Controlgear — Part 3: Particular Requirements for d.c.or a.c. Supplied Electronic Step-down Convertors for Filament Lamps (IEC 61347-2-2:2006, IDT) GB 19510.4-2009	Lamp Controlgear — Part 4: Particular Requirements for a.c. Supplied Electronic Ballasts for Fluorescent Lamps (IEC 61347-2-3:2000, IDT) GB 19510.5-2005	Lamp Controlgear — Part 5: Particular Requirements for d.c. Supplied Electronic Ballasts for General Lighting (IEC 61347-2-4:2000, IDT) GB 19510.8-2009	Lamp Controlgear — Part 8: Particular Requirements for d.c. Supplied Electronic Ballasts for Emergency Lighting (IEC 61347-2-7:2006, IDT) GB 19510.9-2009	Lamp Controlgear — Part 9: Particular Requirements for Ballasts for Fluorescent Lamps (IEC 61347-2-8:2006, IDT) GB 19510.10-2009	Lamp Controlgear — Part 10: Particular Requirements for Ballasts for Discharge Lamps (Excluding Fluorescent Lamps) (IEC 61347-2-9:2003, IDT) GB/T 19655-2005	Auxiliaries for Lamps — Starting Devices (Other Than Glow Starters) — Performance Requirements (IEC 60927:1996, IDT) GB 20550-2013	Glow-starters for Fluorescent Lamps (IEC 60155:2006, IDT) GB/T 20636-2006	Connecting Device — Electrical Copper Conductors — Safety Requirements for Screw-type and Screwless-type Clamping Units — Particular Requirements for Conductors above 35mm2 up to 300mm2 (IEC 60999-2:2003, IDT) GB/T 21209-2007	Guide for the Design and Performance of Cage Induction Motors Specifically Designed for Converter Supply (IEC/TS 60034-25:2004, IDT) IEC 60034 (all parts)	Rotating Electrical Machines IEC 60061 (all parts)	Lamp Caps and Holders Together with Gauges for the Control of Interchangeability and Safety IEC 60079-29-2	Explosive Atmospheres — Part 29-2: Gas Detectors — Selection, Installation, Use and Maintenance of Detectors for Flammable Gases and Oxygen 3 Terms and Definitions For the purposes of this document, the terms and definitions given in GB 3836.1-2010 and the following apply. 3.1 Cable sealing box Auxiliary enclosure provided specifically for the purpose of sealing the insulation of a cable (for example, oil insulated cable) where it is connected to an apparatus. The enclosure may also provide for the connection of separate cable tails to the cable. 3.2 Clearance Shortest distance in air between two conductive parts. 3.3 Creepage distance Shortest distance along the surface of a solid insulating material in contact with air between two conductive parts. 3.4 Duty cycle Repetitive variation of load in which the cycle time is too short for thermal equilibrium to be attained in the first cycle. 3.5 Separation Shortest distance through solid insulating material between two conductive parts. 3.6 Sealing device Device employing a method other than encapsulation to prevent the flow of a gas or a liquid between apparatus and a conduit by providing sealing facilities. 3.7 Type of protection "n" Type of protection applied to electrical equipment such that, in normal operation and in certain specified regular expected occurrences, it is not capable of igniting a surrounding explosive gas atmosphere. Note 1:	Additionally, the requirements of this standard are intended to ensure that a malfunction capable of causing ignition is not likely to occur. Note 2:	An example of a specified regular expected occurrence is a luminaire with failed lamp. 3.7.1 Non-sparking device “nA” Device constructed to minimize the risk of occurrence of arcs or sparks capable of creating an ignition hazard during conditions of normal operation. Note:	For the purposes of this standard normal operation is considered to exclude the removal or insertion of components with the circuit energized. 3.7.2 Devices and components “nC” 3.7.2.1 Enclosed-break device “nC” Device incorporating electrical contacts that are made and broken and that will withstand an internal explosion of the flammable gas or vapour which may enter it without suffering damage and without communicating the internal explosion to the external flammable gas or vapour. Note:	The principle difference between enclosed break devices “nC” and flameproof “d” are that the dimensions are not controlled and that safety factors have not been added. 3.7.2.2 Hermetically-sealed device “nC” Device which is so constructed that the external atmosphere cannot gain access to the interior and in which the seal is made by fusion, for example by soldering, brazing, welding or the fusion of glass to metal. 3.7.2.3 Non-incendive component “nC” Components having contacts for making or breaking a specified ignition capable circuit but in which the contacting mechanism is designed and constructed so that the component is not capable of causing ignition of the specified explosive gas atmosphere. Note:	The enclosure of the non-incendive component is not intended to either exclude the explosive gas atmosphere or contain an explosion. This is usually applied to specially constructed switch contacts that are mechanically designed to quench any arc or spark so that they are not a source of ignition. 3.7.2.4 Sealed device “nC” Device which is so constructed that it cannot be opened during normal service and is sealed effectively to prevent entry of an external atmosphere. 3.7.3 Rrestricted-breathing enclosure “nR” Enclosure that is designed to restrict the entry of gases, vapours and mists. 3.8 Test port Facility to test the integrity of restricted breathing equipment in the field after installation, during initial inspection and during maintenance.
Foreword	II 1 Scope 2 Normative references 3 Terms and Definitions 4 General 5 Temperatures 6 Requirements for Electrical Equipment 7 Connection Facilities and Terminal Compartments 8 Supplementary Requirements for Non-sparking Electrical Rotating Machines 9 Supplementary Requirements for Non-sparking Fuses and Fuse Assemblies 10 Supplementary Requirements for Non-sparking Plugs and Sockets 11 Supplementary Requirements for Non-sparking Luminaires 12 Supplementary Requirements for Equipment Incorporating Non-sparking Cells and Batteries 13 Supplementary Requirements for Non-sparking Low Power Equipment 14 Supplementary Requirements for Non-sparking Current Transformers 15 Other Non-sparking Electrical Equipment 16 General Supplementary Requirements for Equipment Producing Arcs, Sparks or Hot Surfaces 17 Supplementary Requirements for Enclosed-break Devices and Non-incendive Components Producing Arcs, Sparks or Hot Surfaces 18 Supplementary Requirements for Hermetically Sealed Devices Producing Arcs, Sparks or Hot Surfaces 19 Supplementary Requirements for Sealed Devices Producing Arcs, Sparks or Hot Surfaces 20 Supplementary Requirements for Restricted-breathing Enclosures Protecting Equipment Producing Arcs, Sparks or Hot Surfaces 21 General Information on Verification and Tests 22 Type Tests 23 Routine Verifications and Tests 24 Marking 25 Documentation 26 Instructions Annex A (Informative) Application, Installation, and Testing Considerations for Ex “nA” Asynchronous Machines
*GB 1312-2007 Lampholders for tubular fluorescent lamps and starter holders
*GB/T 1406.1-2008 Types and dimensions of lamp caps - Part 1：Screw caps
*GB/T 1406.2-2008 Types and dimentions of lamp caps - Part 2：Pin lamp caps
*GB/T 1406.3-2008 Types and dimensions of lamp caps - Part 3：Prefocus caps
*GB/T 1406.4-2008 Types and dimensions of lamp caps - Part 4: Miscellaneous caps
*GB/T 1406.5-2008 Types and dimensions of lamp caps - Part 5：Bayonet caps
*GB 3836.9-2014 Explosive atmospheres―Part 9:Equipment protection by type of protection “m”
*GB 3836.16-2006 Electrical apparatus for explosive gas atmospheres?Part 16: Inspection and maintenance of electrical installation (other than mines)
*GB/T 4207-2012 Method for the determination of the proof and the comparative tracking indices of solid insulating materials
*GB 7000-1986 General safety requirements and tests for luminaires
*GB 13140.5-2008 Connecting devices for low-voltage circuits for household and similar purposes - Part 2: Particular requirements for twist-on connecting devices
*GB 13539.3-2008 Low-voltage fuses - Part 3:Supplementary requirements for fuses for use by unskilled persons(fuses mainly for household and similar applications) - Examples of standardized systems of
*GB/T 14048.7-2006 Low-voltage switchgear and controlgear - Part 7-1: Ancillary equipment - Terminal blocks for copper conductors
*GB/T 14048.8-2006 Low-voltage switchgear and controlgear - Part 7-2: Ancillary equipment - Protective conductor terminal blocks for copper conductors
*GB 17464-2012 Connecting devices - Electrical copper conductors - Safety requirements for screw-type and screwless-type clamping units - Part 1: General requirements and particular requirements for clamping units for conductors from 0.2 mm2 up to 35 mm2 (included)
*GB 17935-2007 Edison screw lampholders
*GB 17936-2007 Bayonet lampholders
*GB 18489-2008 Capacitors for use in tubular fluorescent and other discharge lamp circuits - General and safety requirements
*GB 18774-2002 Double-capped fluorescent lamps--Safety specifications
*GB 19510.1-2009 Lamp controlgear—Part 1:General and safety requirements
*GB 19510.2-2009 Lamp controlgear—Part 2:Particular requirements for starting devices (other than glow starters
*GB 19510.3-2009 Lamp controlgear—Part 3:Particular requirements for d.c.or a.c. supplied electronic step-down convertors for filament lamps
*GB 19510.4-2009 Lamp controlgear—Part 4:Particular requirements for a.c. supplied electronic ballasts for fluorescent lamps
*GB 19510.5-2005 Lamp controlgear-Part5：Particular requirements for d.c.supplied electronic ballasts for general lighting
*GB 19510.8-2009 Lamp controlgear—Part 8:Particular requirements for d.c.supplied electronic ballasts for emergency lighting
*GB 19510.9-2009 Lamp controlgear—Part 9:Particular requirements for ballasts for fluorescent lamps
*GB 19510.10-2009 Lamp controlgear—Part 10:Particular requirements for ballasts for discharge lamps(excluding fluorescent lamps)
*GB/T 19655-2005 Auxiliaries for lamps - Starting devices (other than glow starters) - Performance requirements
*GB 20550-2013 Glow-starters for Fluorescent Lamps
*GB/T 20636-2006 Connecting device - Electrical copper conductors - Safety requirements for screw-type and screwless-type clamping units - Particular requirements for conductors above 35mm2 up to 300mm
*GB/T 21209-2007 Guide for the design and performance of cage induction motors specifically designed for converter supply
Referred in GB 3836.8-2014:
GB 3836.8-2014 is referred in:
Standard No. GB 3836.8-2014
GB 3836.8-2014
Explosive atmospheres―Part 8:Equipment protection by type of protection “n”
爆炸性环境 第8部分: 由n型保护的设备
GB 3836.8-2003 Electrical apparatus for explosive gas atmospheres?Part 8:Type of protection “n”
GB 3836.8-2014, GB/T 3836.8-2014, GBT 3836.8-2014, GB3836.8-2014, GB 3836.8, GB3836.8, GB/T3836.8-2014, GB/T 3836.8, GB/T3836.8, GBT3836.8-2014, GBT 3836.8, GBT3836.8