GB 3836.8-2014 English PDF (GB3836.8-2014)

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GB 3836.8-2014: Electrical apparatus for explosive gas atmospheres -- Part 8: Type of protection “n”
GB 3836.8-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
K 35
Replacing GB 3836.8-2003
Explosive Atmospheres - Part 8: Equipment Protection
by Type of Protection “n”
(IEC 60079-15:2010 Explosive Atmospheres - Part 15: Equipment Protection
by Type of Protection “n”, MOD)
ISSUED ON: DECEMBER 5, 2014
IMPLEMENTED ON: OCTOBER 16, 2015
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 4 
1 Scope ... 8 
2 Normative References ... 11 
3 Terms and Definitions ... 14 
4 General ... 16 
5 Temperatures ... 17 
6 Requirements for Electrical Equipment ... 17 
7 Connection Facilities and Terminal Compartments ... 28 
8 Supplementary Requirements for Non-sparking Electrical Rotating Machines
... 32 
9 Supplementary Requirements for Non-sparking Fuses and Fuse Assemblies
... 38 
10 Supplementary Requirements for Non-sparking Plugs and Sockets ... 39 
11 Supplementary Requirements for Non-sparking Luminaires ... 40 
12 Supplementary Requirements for Equipment Incorporating Non-sparking
Cells and Batteries ... 48 
13 Supplementary Requirements for Non-sparking Low Power Equipment .. 56 
14 Supplementary Requirements for Non-sparking Current Transformers ... 58 
15 Other Non-sparking Electrical Equipment ... 59 
16 General Supplementary Requirements for Equipment Producing Arcs,
Sparks or Hot Surfaces ... 59 
17 Supplementary Requirements for Enclosed-break Devices and Non-
incendive Components Producing Arcs, Sparks or Hot Surfaces ... 59 
18 Supplementary Requirements for Hermetically Sealed Devices Producing
Arcs, Sparks or Hot Surfaces ... 60 
19 Supplementary Requirements for Sealed Devices Producing Arcs, Sparks
or Hot Surfaces ... 61 
20 Supplementary Requirements for Restricted-Breathing Enclosures
Protecting Equipment Producing Arcs, Sparks or Hot Surfaces ... 62 
21 General Information on Verification and Tests ... 67 
22 Type Tests ... 67 
23 Routine Verifications and Tests ... 79 
24 Marking ... 81 
25 Documentation ... 84 
26 Instructions ... 85 
Appendix A (informative) Application, Installation, and Testing Considerations
for Ex “nA” Asynchronous Machines ... 86 
Foreword
All the technical content of this Part is mandatory.
GB 3836 Explosive Atmospheres is divided into the following parts:
---Part 1: Equipment - General Requirements;
---Part 2: Equipment Protection by Flameproof Enclosures “d”;
---Part 3: Equipment Protection by Increased Safety “e”;
---Part 4: Equipment Protection by Intrinsic Safety “i”;
---Part 5: Equipment Protection by Pressurized Enclosure “p”
---Part 6: Equipment Protection by Liquid Immersion “o”;
---Part 7: Equipment Protection by Powder Filling “q”;
---Part 8: Equipment Protection by Type of Protection “n”;
---Part 9: Equipment Protection by Type of Protection “m”;
---Part 11: Equipment Protection by Flameproof Enclosures “d” - Method of Test
for Ascertainment of Maximum Experimental Safe Gap;
---Part 12: Classification of Gases or Vapors with Air according to Their Maximum
Experimental Safe Gaps and Minimum Igniting Current;
---Part 13: Equipment Repair, Overhaul and Reclamation;
---Part 14: Classification of Areas - Explosive Gas Atmosphere;
---Part 15: Electrical Installations - Design, Selection and Erection;
---Part 16: Electrical Installations - Inspection and Maintenance;
---Part 17: Construction and Use of Rooms or Buildings Protected by
Pressurization;
---Part 18: Intrinsically Safety Electrical Systems;
---Part 19: Fieldbus Intrinsically Safe Concept (FISCO);
---Part 20: Equipment with Equipment Protection Level (EPL) Ga.
……
This is Part 8 of GB 3836.
This Part was drafted in accordance with the rules in GB/T 1.1-2009.
This Part serves as a replacement of GB 3836.8-2003 Electrical Apparatus for
Explosive Gas Atmospheres - Part 8: Type of Protection “n”.
In comparison with GB 3836.8-2003, the main changes are as follows:
---The title of the standard is changed;
---Table 1 is added, which explains the relationship with GB 3836.1;
---Definitions that have appeared in GB 3836.1-2010 are deleted;
---Type “n” positive pressure is deleted; all the requirements for positive pressure
are stipulated in GB 3836.5;
---The air gap spark assessment and test requirements for electric motors above
100 kW are added;
---The risk assessment table for electric motors above 1 kV or 100 kW is added;
---The requirements for power supply motors of frequency converters are modified;
---The reference standard of lamps and lanterns is added;
---It is added that cap-lights and hand-lights shall comply with the relevant
requirements of GB 3836.1-2010;
---Table 10 Requirements for Creepage Distance and Electrical Clearance of Low-
power Equipment is added;
---The requirements for the protection level of plugs and sockets are added;
---Cable clamping test is deleted;
---The adjustment of E40 / E39 lamp cap test screw-in and screw-out torque value
is reduced;
---The high-voltage pulse test of rectifier is deleted;
---The test and determination standards for lamp starters and triggers are modified;
---The ignition test of large or high-voltage motors is added;
---The markings and clauses are modified;
---The responsibility of the manufacturer is deleted and replaced by an instruction
manual;
---The equipment protection level is added;
---The requirements for limited energy “nL” and associated energy limited
equipment “[nL]” are deleted;
---The requirements for “nC” pouring-sealing device are deleted;
---The requirements for electrical connection are added and explained;
---The requirements for lamp ballast are added and explained;
---The requirements for the evaluation and test of motor rotors are added;
---The15 kV limit of equipment protection by type of protection “n” is added;
---The requirements for separation of voltages above 10 kV are modified;
---The requirements for restricted breathing enclosure are modified;
---The requirements for motor rotors and stators are modified;
---Appendix A (informative) is added.
This Part adopts the re-drafting law in the modification and adoption of IEC 60079-
15:2010 Explosive Atmospheres - Part 15: Equipment Protection by Type of Protection
“n”.
In comparison with IEC 60079-15:2010, the technical differences and the causes for
the differences are as follows:
---The column which compares with the clauses of IEC 60079-0 Ed.6.0 (currently
being formulated) in Table 1 of IEC 60079-15:2010 is deleted;
---NOTE 1 of Scope “Where there were no requirements, indicated by “NR” or
there is a conflict between requirements, the later edition requirements take
precedence.” is deleted.
---Undated references in Normative References are modified into dated
references.
This Part was proposed by China Electrical Equipment Industry Association.
This Part shall be under the jurisdiction and interpretation of National Technical
Committee 9 on Explosion Protected Electrical Apparatus of Standardization
Administration of China (SAC/TC 9).
Explosive Atmospheres - Part 8: Equipment Protection
by 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” intende...