GB/T 3836.3-2021 English PDF (GB/T3836.3-2021)

GB/T 3836.3-2021: Explosive atmospheres - Part 3: Equipment protection by increased safety "e"
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GB/T 3836.3-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
CCS K 35
Replacing GB 3836.3-2010
Explosive atmospheres - Part 3: Equipment protection by
increased safety "e"
(IEC 60079-7:2015, Explosive atmospheres - Part 7: Equipment protection by
increased safety "e", MOD)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 4 
Introduction ... 12 
1 Scope ... 15 
2 Normative references ... 16 
3 Terms and definitions ... 20 
4 Constructional requirements... 24 
4.1 Level of Protection ... 24 
4.2 Electrical connections ... 24 
4.3 Clearances ... 31 
4.4 Creepage distances ... 32 
4.5 Printed wiring boards with conformal coating, Level of Protection “ec” ... 40 
4.6 Solid electrical insulating materials ... 40 
4.7 Windings ... 42 
4.8 Temperature limitations ... 43 
4.9 Wiring internal to equipment ... 45 
4.10 Degrees of protection provided by enclosures ... 45 
4.11 Fasteners ... 47 
5 Supplementary requirements for specific electrical equipment ... 47 
5.1 General ... 47 
5.2 Electrical machines ... 48 
5.3 Luminaires, hand lights, or cap lights ... 60 
5.4 Analog measuring instruments and instrument transformers ... 72 
5.5 Transformers other than instrument transformers ... 73 
5.6 Supplementary requirements for equipment incorporating cells and batteries ... 73 
5.7 General purpose connection and junction boxes ... 84 
5.8 Resistance heating equipment (other than trace heating systems) ... 84 
5.9 Supplementary requirements for fuses ... 89 
5.10 Other electrical equipment ... 90 
6 Type verifications and type tests ... 90 
6.1 Dielectric strength ... 90 
6.2 Rotating electrical machines ... 91 
6.3 Luminaires ... 94 
6.4 Measuring instruments and instrument transformers ... 101 
6.5 Transformers other than instrument transformers ... 102 
6.6 Verification and tests for cells and batteries of Level of Protection “eb” ... 102 
6.7 Verification and tests for cells and batteries of Level of Protection “ec” ... 105 
6.8 General purpose connection and junction boxes ... 105 
6.9 Resistance heating equipment ... 106 
6.10 Terminal insulating material tests ... 108 
7 Routine verifications and routine tests ... 109 
7.1 Dielectric tests ... 109 
7.2 Dielectric tests for batteries ... 109 
7.3 Inter-turn overvoltage tests ... 109 
8 Ex Component certificates ... 110 
8.1 General ... 110 
8.2 Terminals ... 110 
9 Marking and instructions ... 110 
9.1 General marking ... 110 
9.2 Ex Component enclosures... 112 
9.3 Instructions for use ... 112 
9.4 Warning markings ... 114 
10 Documentation ... 114 
Annex A (normative) Temperature determination of electrical machines - Methods of
test and of calculation ... 116 
Annex B (normative) Type tests for specific forms of resistance heating devices or
resistance heating units (other than trace heater) ... 121 
Annex C (informative) Cage motors - Thermal protection in service ... 123 
Annex D (informative) Resistance heating devices and units - Additional electrical
protection ... 124 
Annex E (informative) Combinations of terminals and conductors for general purpose
connection and junction boxes ... 125 
Annex F (normative) Dimensions of copper conductors ... 128 
Annex G (normative) Test procedure for T5 (only 8 W), T8, T10 and T12 lamps ... 129 
Annex H (normative) Alternative separation distances for Level of Protection “ec”
equipment under controlled environments ... 135 
Annex I (informative) Application, installation, and testing considerations for Level of
Protection “ec” asynchronous machines ... 138 
Annex J (informative) Luminaires incorporating LEDs ... 140 
Bibliography ... 141 
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document is Part 3 of GB/T 3836 "Explosive atmospheres". The following parts
of GB/T 3836 have been issued:
- Part 1: Equipment - General Requirements;
- Part 2: Equipment Protection by Flameproof Enclosure "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 Level of Protection (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 Ma 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 3836.3-2010 Explosive atmospheres - Part 3: Equipment
protection by increased safety "e". Compared with GB 3836.3-2010, in addition to the
structural and editorial changes, the main technical changes in this document are as
follows:
- Added the requirements for the classification of increased safety "e" electrical
equipment and Ex components according to Level of Protection "eb" and Level of
Protection "ec" (from "nA" in GB 3836.8-2014) (see Chapter 1 of this Edition);
- Added the requirements for different Level of Protections of "eb" and "ec" for
electrical connections (see 4.2 of this Edition);
- Added the requirements for Level of Protection "ec" printed circuit boards (see 4.5
of this Edition);
- Changed the requirements for solid electrical insulating materials (see 4.6 of this
Edition, 4.5 of Edition 2010);
- Changed the general content of limit temperature and added the determination
condition for maximum surface temperature (see 4.8.1 of this Edition. 4.7.1 of
Edition 2010);
- Changed the requirements for enclosure Level of Protection (see 4.10 of this
Edition, 4.9 of Edition 2010);
- Added different requirements for motors according to Level of Protection "eb" and
Level of Protection "ec" (see 5.2.1, 5.2.3, 5.2.4, 5.2.8.3, 5.2.8.4, 5.2.9, 5.2.10, Table
6, 5.2.13 of this Edition);
- Deleted the limit temperature requirements for the motor stator winding terminals
in the starting state (see 5.2.6 of Edition 2010);
- Added the requirements for light-emitting diodes (LEDs) according to Level of
Protection "ec" (see 5.3.2.5, 5.3.4.3 of this Edition);
- Added the requirements for the electrical spacing of lamps according to Level of
Protection "eb" and Level of Protection "ec" (see 5.3.4 of this Edition);
- Added the requirements for the lamp holder of the double foot lamp according to
for Level of Protection "eb" and Level of Protection "ec" (see 5.3.5.3 of this
Edition);
- Added the requirements for bayonet sockets for lamps (see 5.3.5.4.2 of this Edition);
- Added the requirements for the internal auxiliary equipment of lamps according to
Level of Protection "ec" (see 5.3.6 of this Edition);
- Added the requirements for tubular double-pin fluorescent lamps according to
Level of Protection "eb" and Level of Protection "ec" (see 5.3.9 of this Edition);
- Added the requirements for equipment containing single cells or battery packs
according to Level of Protection "eb" and Level of Protection "ec" (see 5.6 of this
Edition);
- Added the documentation requirements (see Chapter 10 of this Edition);
- Added the selection of separation distances for equipment of Level of Protection
"ec" in a controlled environment (see Annex H of this Edition).
This document uses redrafting method to modify and adopt IEC 60079-7:2015
Explosive atmospheres - Part 7: Equipment protection by increased safety "e".
The technical differences between this document and IEC 60079-7:2015 and their
reasons are as follows:
- About the normative references, this document has adjusted with technical
differences to adapt to the technical conditions of China. The adjustment is
concentrated in Chapter 2 "Normative references", as follows:
● Replace IEC 60034-1 with GB/T 755 which equivalently adopts IEC 60034-1
(see 4.8.3);
● Replace ISO 527-2 with GB/T 1040.2 which equivalently adopts ISO 527-2
(see 4.6.1);
● Replace IEC 60400 with GB/T 1312 which equivalently adopts IEC 60400 (see
5.3.5.3.1);
● Replace IEC 60061-1 with GB/T 1406.1 which modifies IEC 60061-1 (see
5.3.2.3);
● Replace IEC 60061-1 with GB/T 1406.2 which modifies IEC 60061-1 (see
5.3.5.3.1);
● Replace IEC 60061-1 with GB/T 1406.5 which modifies IEC 60061-1 (see
5.3.2.4);
● Replace IEC 60068-2-6 with GB/T 2423.10 which equivalently adopts IEC
60068-2-6 (see 6.3.6);
● Replace IEC 60068-2-42 with GB/T 2423.19 which equivalently adopts IEC
60068-2-42 (see 6.3.5);
● Replace ISO 2859-1with GB/T 2828.1 which equivalently adopts ISO 2859-1
(see 7.1);
● Replace IEC 60079-0 with GB/T 3836.1 which modifies IEC 60079-0 (see
Chapter 1);
● Replace IEC 60079-1 with GB/T 3836.2 which modifies IEC 60079-1 (see
5.3.5.2.2);
● Replace IEC 60079-11 with GB/T 3836.4 which modifies IEC 60079-11 (see
4.10.3);
● Replace IEC 60228 with GB/T 3956 which equivalently adopts IEC 60228 (see
4.2.1);
● Replace IEC 60112 with GB/T 4207 which equivalently adopts IEC 60112 (see
4.4.1);
Explosive atmospheres - Part 3: Equipment protection by
increased safety "e"
1 Scope
This document specifies the requirements for the design, construction, testing and
marking of electrical equipment and Ex Components with type of protection increased
safety “e” intended for use in explosive gas atmospheres.
Electrical equipment and Ex Components of type of protection increased safety “e” are
either:
a) Level of Protection “eb” (EPL “Mb” or "Gb”); or
b) Level of Protection “ec” (EPL “Gc”)
Level of Protection “eb” applies to equipment or Ex Components, including their
connections, conductors, windings, lamps, and batteries; but not including
semiconductors or electrolytic capacitors.
NOTE 1: The use of electronic components, such as semiconductors or electrolytic capacitors, is
excluded from Level of Protection “eb” as expected malfunctions could result in excessive
temperatures or arcs and sparks if the internal separation distances were not applied. It is not
generally practical to maintain those separation distances and maintain the function of the electronic
component.
Level of Protection “ec” applies to equipment or Ex Components, including their
connections, conductors, windings, lamps, and batteries; and also including
semiconductors and electrolytic capacitors.
NOTE 2: The use of electronic components, such as semiconductors or electrolytic capacitors, is
permitted in Level of Protection “ec” as these are evaluated under both normal conditions and
regular expected occurrences and are not likely to result in excessive temperatures or arcs and sparks.
As the requirements for separation distances are not applied to the internal construction,
commercially available electronic components are generally suitable if the external separation
distances comply.
The requirements of this document apply to both Levels of Protection unless otherwise
stated.
For Level of Protection “eb”, this document applies to electrical equipment where the
rated voltage does not exceed 11 kV r.m.s., a.c. or d.c.
For Level of Protection “ec”, this document applies to electrical equipment where the
rated voltage does not exceed 15 kV r.m.s., a.c. or d.c.
NOTE 3: Short circuit currents flowing through increased safety connections of mains circuits are
not considered to create a significant risk of ignition of an explosive gas atmosphere due to
movement of connections as a result of mechanical stresses created by the short circuit current.
Normal industrial standards require that the effects of short time high currents on the security of
connections be considered. The presence of the explosive gas atmosphere does not adversely affect
the security of the connection.
NOTE 4: Any short-term thermal excursions that occur as a result of electrical current excursions
above normal rated currents, such as those that occur during the starting of motors, are not
considered to create a significant risk of ignition of an explosive gas atmosphere due to the ...