GB/T 3836.8-2021 English PDF (GBT3836.8-2021)

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GB/T 3836.8-2021: Explosive atmospheres -- Part 8: Equipment protection by type of protection "n"
GB/T 3836.8-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 3836.8-2014
Explosive atmospheres - Part 8: Equipment protection by
type of protection “n”
(IEC 60079-15:2017, Explosive atmospheres - Part 15: Equipment
protection by type of protection “n”, MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
Introduction ... 9 
1 Scope ... 12 
2 Normative references ... 18 
3 Terms and definitions ... 18 
4 General ... 20 
5 Maximum surface temperatures ... 21 
6 Requirements for electrical equipment ... 21 
7 Requirements for non-incendive components ... 22 
8 Requirements for hermetically sealed devices ... 22 
9 Requirements for sealed devices ... 23 
10 Requirements for restricted-breathing enclosures ... 24 
11 Type Tests ... 29 
12 Routine verifications and tests ... 33 
13 Marking ... 35 
14 Documentation ... 37 
15 Instructions ... 37 
Bibliography ... 38 
Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Directives for
standardization - Part 1: Rules for the structure and drafting of standardizing
documents".
This document is Part 8 of GB/T 3836 "Explosive atmospheres". GB/T 3836 has issued
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 encapsulation 'm';
- Part 11: Material characteristics for gas and vapour classification - Test methods
and data;
- Part 12: Material characteristics for combustible dusts - Test methods;
- Part 13: Equipment repair, overhaul, reclamation and modification;
- 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: Equipment protection by pressurized room “p” and artificially ventilated
room “v”;
- Part 18: Intrinsically safe electrical systems;
- Part 20: Equipment with equipment protection level (EPL) Ga;
- Part 21: Application of quality systems for equipment manufacture;
- Part 22: Protection of equipment and transmission system using optical radiation;
- Part 23: Group Ⅰ, category EPL equipment intended to remain functional in
atmospheres endangered by firedamp and/or coal dust;
- Part 24: Equipment protection by special protection “s”;
- Part 25: Requirements for process sealing between flammable process fluids and
electrical systems;
- Part 26: Electrostatic hazards - Guidance;
- Part 27: Electrostatic hazards - Test;
- Part 28: Non-electrical equipment for explosive atmospheres - Basic method and
requirements;
- Part 29: Non-electrical equipment for explosive atmospheres - Constructional
safety 'c', control of ignition source 'b', liquid immersion 'k';
- Part 30: Equipment and components in explosive atmospheres in underground
mines;
- Part 31: Equipment dust ignition protection by enclosure 't';
- Part 32: Intrinsically safe systems with electronically controlled spark duration
limitation;
- Part 33: Equipment in adverse service conditions;
- Part 34: Equipment assemblies;
- Part 35: Classification of areas for explosive dust atmospheres.
This document replaces GB 3836.8-2014 "Electrical apparatus for explosive gas
atmospheres - Part 8: Type of protection ‘n’". Compared with GB 3836.8-2014, the
main technical changes are as follows:
- Change the range of internal working voltage (see Clause 1; Clause 1 of the 2014
edition);
- Delete non-sparking device "nA", which has been included in GB/T 3836.3 "ec"
(see Clause 3 of the 2014 edition);
- Delete enclosed break device "nC", which has been included in GB/T 3836.2 "dc"
(see Clause 3 of the 2014 edition);
- Modify the definition of hermetically-sealed device “nC” (see Clause 3; Clause 3
of the 2014 edition);
- Add the definition of normally sparking device (see Clause 3);
- Delete the content of small components (see 5.2 of the 2014 edition);
- Delete the requirements for connectors and wiring cavities (see Clause 7 of the
2014 edition);
- Delete the supplementary requirements for non-sparking rotating electric machines
(see Clause 8 of the 2014 edition);
- Delete the supplementary requirements for non-sparking fuses and fuse assembly
(see Clause 9 of the 2014 edition);
- Delete the supplementary requirements for non-sparking plugs and sockets (see
Clause 10 of the 2014 edition);
- Delete the supplementary requirements for non-sparking luminaires (see Clause 11
of the 2014 edition);
- Delete the supplementary requirements for equipment with non-sparking cells (see
Clause 12 of the 2014 edition);
- Delete the supplementary requirements for non-sparking low-power equipment
(see Clause 13 of the 2014 edition);
- Delete the supplementary requirements for non-sparking current transformers (see
Clause 14 of the 2014 edition);
- - Delete the requirements for other non-sparking electrical equipment (see Clause
15 of the 2014 edition);
- Delete the general supplementary requirements for equipment generating arcs,
sparks or hot surfaces (see Clause 16 of the 2014 edition);
- Delete the requirements for enclosed circuit breakers (see Clause 17 of the 2014
edition);
- Add voltage and current limiting of non-incendive components (see 7.2);
- Change the requirements for sealed devices (see Clause 9; Clause 19 of the 2014
edition);
- Delete the requirement that the COT of the lighting material is higher than 20 K
(see 19.5 of the 2014 edition);
- Add requirements for compliance with industrial standards (see 10.2.1);
- Add requirements for cells (see 10.2.2);
- Change the requirements for cable glands and conduit entries (see 10.2.3; 20.2.2 of
the 2014 edition);
- Change the requirements for gasketed windows (see 10.2.5.2; 20.2.4.2 of the 2014
edition);
- Add documentation requirements for gaskets and seals (see 10.2.6);
- Change the requirements for non-resilient seals (see 10.2.7; 20.2.6 of the 2014
edition);
- Add the requirements for internal fans of restricted-breathing enclosures (see
10.2.9);
- Delete the type test for enclosed break device "nC" and non-sparking device "nA"
(see 22.4 of the 2014 edition);
- Add the preparation of non-incendive component samples (see 11.1.1);
- Change the requirements for dielectric strength test (see 12.1; 22.5.2 of the 2014
edition);
- Delete the type tests for sealed devices, screws, starters, luminaires, ignition
devices and triggers (see Clause 22 of the 2014 edition);
- Delete all cell tests (see 22.11 and 22.12 of the 2014 edition);
- Delete all motor tests (see 22.13 of the 2014 edition);
- Change the requirements for routine tests (see Clause 12; Clause 23 of the 2014
edition);
- Change the requirements for marking (see Clause 13; Clause 24 of the 2014
edition);
- Change the requirements for documentation (see Clause ...