GB 3836.3-2010 English PDF (GB3836.3-2010)

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GB 3836.3-2010: [Replaced by GB/T 3836.3-2021] Explosive atmospheres -- Part 3: Equipment protection by increased safety “e”
GB 3836.3-2010
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.260.20
K 35
GB 3836.3-2010 / IEC 60079-7:2006
Replacing GB 3836.3-2000
Explosive atmospheres -
Part 3: Equipment protection by increased safety "e"
(IEC 60079-7:2006, IDT)
ISSUED ON: AUGUST 09, 2010
IMPLEMENTED ON: AUGUST 01, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 9 
4 Constructional requirements for all electrical apparatus ... 14 
5 Supplementary requirements for specific electrical apparatus ... 31 
6 Type verifications and type tests ... 56 
7 Routine verifications and routine tests ... 69 
8 Ex component certificates ... 70 
9 Marking and instructions ... 71 
Annex A (Normative) Cage rotor motors - Methods of test and of calculation 75 
Annex B (Normative) Type tests for specific forms of resistance heating devices
or resistance heating units (other than trace heater) ... 78 
Annex C (Informative) Cage rotor motors - Thermal protection in service ... 81 
Annex D (Informative) Resistance heating devices and units - Additional
electrical protection ... 82 
Annex E (Informative) Combinations of terminals and conductors for general
purpose connection and junction boxes ... 83 
Annex F (Informative) Dimensions of copper conductors ... 86 
Annex G (Informative) Potential stator winding discharge risk assessment -
Ignition risk factors ... 87 
Annex H (Normative) Test procedure for T8, T10 and T12 lamps ... 88 
Annex I (Informative) Introduction of a risk assessment method encompassing
‘Equipment Protection Levels’ for Ex Equipment ... 94 
Foreword
All technical content of this Part is mandatory.
GB 3836 "Explosive atmospheres" is divided into several 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: Pressurized enclosures “p”;
- Part 6: Oil-immersion “o”;
- Part 7: Power filling “q”;
- Part 8: Type of protection “n”;
- Part 9: Encapsulation m;
- Part 11: Method of test for ascertainment of maximum experimental safe
gap;
- Part 12: Classification of mixtures of gases or vapours with air according to
their maximum experimental safe gaps and minimum igniting current;
- Part 13: Repair and overhaul for apparatus used in explosive gas
atmospheres;
- Part 14: Classification of hazardous areas;
- Part 15: Electrical installation in hazardous areas (other than mines);
- Part 16: Inspection and maintenance of electrical installation (other than
mines);
- Part 17: Construction and use of rooms or building protected by
pressurization;
- Part 18: Intrinsically safe system;
- Part 19: Fieldbus intrinsically safe concept (FISCO);
- Part 20: Equipment with equipment protection level (EPL) Ga.
This Part is Part 3 of the GB 3836 series. This Part is identical to IEC 60079-
7:2006 "Explosive atmospheres - Part 7: Equipment protection by increased
safety "e"" (English edition). This Part is technically fully consistent with IEC
60079-7:2006. Only some editorial changes have been made.
This Part replaces GB 3836.3-2000 "Electrical apparatus for explosive gas
atmospheres - Part 3: Increased safety e".
Compared with GB 3836.3-2000, the main changes in this Part are as follows:
- ADD 6 new terms;
- Modify the electrical connections;
- Modify the voltage classes and corresponding values and related notes in
the table of creepage distances and clearances;
- ADD the requirements for degree of protection provided by the enclosure
of apparatus group I equipped with drain holes or ventilation openings;
- ADD regulations on the degree of protection provided by enclosures with
intrinsically-safe circuits or parts;
- ADD requirements for assessing rotor construction which may generate air
gap sparking;
- ADD the requirements for windings of rotating electrical machines;
- ADD the relevant requirements for the shaft seals of rotating electrical
machines;
- ADD the limit temperature requirements for the stator winding terminals;
- ADD the assessment and test requirements for high-voltage machines;
- Modify the requirements for lampholders and lamp caps of luminaires.
Delete Annex A of the former standard and include its content into the text;
and, add relevant requirements;
- ADD the requirements for tubular fluorescent bi-pin lamps;
- ADD the provision that measuring instruments with moving coils are not
permitted;
- ADD requirements for primary and secondary batteries with a capacity
equal to or less than 25 Ah;
Explosive atmospheres -
Part 3: Equipment protection by increased safety "e"
1 Scope
This Part of GB 3836 specifies the requirements for the design, construction,
testing and marking of electrical apparatus with type of protection increased
safety "e" intended for use in explosive gas atmospheres. This Part applies to
electrical apparatus where the rated voltage does not exceed 11 kV r.m.s. a.c.
or d.c. Additional measures are applied to ensure that the apparatus does not
produce arcs, sparks, or excessive temperatures in normal operation or under
specified abnormal conditions.
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 takes precedence.
Note: Increased safety "e" can provide Equipment Protection Levels (EPL) Mb or Gb. For
further information, see Annex I.
2 Normative references
The following documents contain provisions which, through reference in this
Part of GB 3836, constitute provisions of this Part. For the dated references,
their subsequent amendments (excluding corrections) or revisions do not apply
to this Part. However, the parties who enter into agreement based on this Part
are encouraged to investigate whether the latest editions of these documents
are applicable. For undated reference documents, the latest editions apply to
this Part.
GB 755-2008 Rotating electrical machines - Rating and performance (IEC
60034-1:2004, IDT)
GB 1312-2007 Lamp holders 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 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/T 2423.10-2008 Environmental testing for electric and electronic
products - Part 2: Test methods - Test Fc: Vibration (sinusoidal) (IEC 60068-
2-6:1995, IDT)
GB/T 2828.1-2003 Sampling procedures - Part 1: retrieval by acceptance
quality limit (AQL) for lot-by-lot inspection sampling plan (ISO 2859-1:1999,
IDT)
GB/T 2900.35-2008 Electrotechnical terminology - Equipment for explosive
atmospheres (IEC 60050(426):2008, IDT)
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
Flameproof Enclosures “d” (IEC 60079-1:2007, MOD)
GB 3836.4-2010 Explosive Atmospheres - Part 4: Equip...