GB 50058-2014 PDF English
US$145.00 · In stock · Download in 9 secondsGB 50058-2014: Code for design of electrical installations in explosive atmospheres Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 50058: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 50058-2014 | English | 145 |
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Code for design of electrical installations in explosive atmospheres
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| GB 50058-1992 | English | RFQ |
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Specifications for the design of electric systems in places with explosion and fire (Offcial version PDF - Translated by the Ministry of P. R. China / Research Institute.)
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GB 50058-2014: Code for design of electrical installations in explosive atmospheres---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50058-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50058-2014
Code for design of electrical installations in
explosive atmospheres
Issued on. JANUARY 29, 2014
Implemented on. OCTOBER 1, 2014
Issued by. Ministry of Housing and Urban-Rural Development of the
People’s Republic of China;
General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China.
Table of Contents
Foreword... 4
1 General provisions... 6
2 Terms... 7
3 Explosive gas atmosphere... 11
3.1 General requirement... 11
3.2 Classification of hazardous area in explosive gas atmosphere... 12
3.3 Extension of hazardous area in explosive gas atmosphere... 15
3.4 Grading and grouping of explosive gas mixture... 17
4 Explosive dust atmosphere... 18
4.1 General requirement... 18
4.2 Classification of hazardous area in explosive dust atmosphere... 19
4.3 Extension of hazardous area in explosive dust atmosphere... 20
5 Electrical installations in explosive atmosphere... 22
5.1 General requirement... 22
5.2 Selection of electrical equipment in explosive atmosphere... 22
5.3 Erection of electrical equipment in explosive atmosphere... 26
5.4 Design of electrical wiring in explosive atmosphere... 27
5.5 Grounding design in explosive atmosphere... 31
Annex A Example drawing and condition of classification of explosive hazardous area... 33
Annex B Typical example drawing of extension of hazardous area in explosive gas
atmosphere... 38
Annex C Grading and grouping of explosive gas or vapor mixture... 54
Annex D Typical example drawing of extension of hazardous area in explosive dust
atmosphere... 70
Annex E Example of characteristics of combustible dust... 76
Explanation of wording in this Code... 82
List of quoted standard... 83
1 General provisions
1.0.1 In order to standardize the design of electrical instillations in explosive
atmosphere, make electrical installations in explosive atmosphere follow the policies
of prevention first, guarantee the personal and property safety and take preventive
measures according to circumstances, this Code is hereby developed.
1.0.2 This Code applies to the classification of explosive hazardous areas of new,
expanded and reconstructed projects where explosive hazardous environment
emerges or may emerge during production, processing, handling, transshipment and
storage process as well as design of electrical installations.
The Code dos not apply to the following environments.
1.0.3 This Code does not consider the effect of indirect harm on classification of
explosive hazardous areas and design of related electrical installations.
1.0.4 Classification of explosive hazardous areas shall be negotiated to complete
jointly by professional personnel who are in charge of production technology
processing media properties, equipment and processing properties and engineering
technical personnel who are in charge of safety and electrical engineering.
1.0.5 Besides conforming to the Code, design of electrical installations in explosive
atmosphere shall also comply with the provisions of existing related national standards.
2 Terms
2.0.1 Flash point
Minimum liquid temperature that the amount of making liquid become vapor can form
flammable gas or air mixture under standard conditions.
2.0.2 Ignition temperature
Minimum temperature that mixture of flammable gas or vapor is ignited by hot surface
under specified conditions.
2.0.3 Ambient temperature
Referring to the average maximum temperature of the hottest months over years in
designated area.
2.0.4 Flammable material
Referring to that the material itself is flammable and can produce flammable gas, vapor
or mist.
2.0.5 Flammable gas or vapor
Gas or vapor that will form an explosive gas atmosphere after mixing with air at a
certain percentage.
2.0.6 Flammable liquid
Liquid that can produce flammable vapor or mist under the foreseeable conditions of
use.
2.0.7 Flammable mist
Flammable liquid droplets that form an explosive atmosphere by volatile in the air.
2.0.8 Explosive gas mixture
Under atmospheric conditions, combustion will spread over the whole scope after
mixture of gas, vapor or mist-like flammable material and air is ignited.
2.0.9 Highly volatile liquid
Highly volatile liquid refers to the liquid that absolute vapor pressure exceeds 276 kPa
at a temperature of 37.8 °C. These liquids include butane, ethane, ethylene, propane,
propylene, liquefied natural gas, natural gas liquids and their mixture.
2.0.10 Explosive gas atmosphere
The environment that mixture of gas or vapor can spread combustion voluntarily after
being ignited under atmospheric conditions.
2.0.11 Explosive limit
2.0.12 Hazardous area
The area that the quantity of existing explosive mixture or expected quantity of existing
explosive mixture is sufficient to take precautionary measures for the structure,
erection and use of electrical equipment.
2.0.13 Non-hazardous area
The area where the quantity of existing explosive mixture is insufficient to take
precautionary measures for the structure, erection and use of electrical equipment.
2.0.14 Area
All or part of explosive hazardous area. It can be classified into several areas in
different degrees of danger according to the emerging frequency and duration of
explosive mixture.
2.0.15 Source of release
Position or location of the material that can form explosive mixture.
2.0.16 Natural ventilation atmosphere
The area where fresh air can replace the original mixture due to the role of natural wind
or temperature difference.
2.0.17 Artificial ventilation atmosphere
The area where air fan, exhaust fan and other installations are used to replace original
mixture with fresh air.
2.0.18 Normal operation
Refer to the operating conditions of equipment within the range of design parameters.
2.0.22 Conductive dust
Dust that resistivity is equal to or less than 1×103 Ω·m.
2.0.23 Non-conductive dust
Dust that resistivity is greater than 1×103 Ω·m.
2.0.24 Explosive dust atmosphere
Under atmospheric conditions, the environment that can keep voluntary spread of
burning after the mixture of combustible dust and air is ignited.
2.0.25 Heavier-than-air gases or vapors
Gas or vapor that relative density is greater than 1.2.
2.0.26 Lighter-than-air gases or vapors
Gas or vapor that relative density is less than 0.8.
2.0.27 Ignition temperature of dust layer
Minimum temperature of hot surface where dust layer with stipulated thickness is
ignited.
3 Explosive gas atmosphere
3.1 General requirement
3.1.1 There shall be design of electrical installations in explosive gas atmosphere when
one of the following explosive gas mixture atmospheres occurs or probably occurs
during production, processing, handling, transshipping or storage process.
3.1.2 Explosion in an explosive atmosphere shall comply with the following conditions.
3.2.2 It may be classified as non-explosive hazardous area when meeting one of the
following conditions.
3.2.3 Source of release shall be classified into continuous-grade source of release,
first-grade source of release and second-grade source of release according to release
frequency and duration of flammable material. Grading of source of release shall meet
the following requirements.
3.3 Extension of hazardous area in explosive gas atmosphere
3.3.1 Extension of hazardous area for explosive gas atmosphere shall be determined
according to the following requirements.
3.3.2 Grade and extension of explosive hazardous areas shall follow the provisions in
Annex A of this Code and is determined according to the release amount, release rate,
boiling point, temperature, flash point, relative density, lower explosive limit, obstacles
and other conditions in combination with practical experience.
3.3.3 When the workshop in explosive gas atmosphere cannot form explosive gas
atmosphere after adopting positive pressure or continuous ventilation dilution
measures, the workshop may be reduced to a non-explosive hazardous environment.
Air source introduced through ventilation shall be safe and reliable and has no
flammable material, corrosive media and mechanical impurities; air inlet shall be 1.5
m higher than the extension of explosive area classified.
3.3.4 Design of electrical installations in explosive gas atmosphere shall include
explosion hazard zoning map; simple or small plants may be expressed through literal
statement.
3.4 Grading and grouping of explosive gas mixture
4 Explosive dust atmosphere
4.1 General requirement
4.1.1 When explosive dust mixture formed by air and dust that occur or may occur
during production, processing, transshipment or storage process, design of electrical
installations in explosive dust atmosphere shall be carried out.
4.1.2 Dust in explosive dust environment may be classified into the following three
grades.
4.1.4 The following measures to prevent an explosion shall be adopted in explosive
dust environments.
4.2 Classification of hazardous area in explosive dust atmosphere
4.2.1 Dust source of release shall be classified into continuous-grade source of release,
first-grade source of release and second-grade source of release according to release
frequency and duration of explosive dust. Source of release shall meet the following
requirements.
4.2.2 Explosive hazardous area shall be classified into area 20, area 21 and area 22
based on the frequency of explosive dust environment and duration; areas shall
comply with the following provisions.
4.3 Extension of hazardous area in explosive dust atmosphere
4.3.1 Under normal circumstances, extension shall be determined through evaluating
the possibility that the grade of source of release involving this environment causes
explosive dust atmosphere.
4.3.2 Extension of area 20 mainly includes the interior area of pipes and production
and processing equipment where dust cloud generates continuously. When the outside
of dust container continuously has explosive dust environment, it may be classified as area 20.
4.3.4 Extension of area 22 shall be determined according to the following provisions.
1 For the places formed by second-grade source of release, area scope shall be
4.3.5 Typical example drawing on extension of hazardous area in explosive dust
atmosphere shall comply with the provisions in Annex D of this Code.
4.3.6 Examples of flammable dust shall comply with the provisions in Annex E of this
Code.
5 Electrical installations in explosive atmosphere
5.1 General requirement
5.1.1 The electrical installations in explosive atmosphere shall be designed in
accordance with the following regulations.
5.2 Selection of electrical equipment in explosive atmosphere
5.2.1 In the explosive atmosphere, the selection of electrical equipment shall consider
the following factors.
5.3 Erection of electrical equipment in explosive atmosphere
5.3.1 Oil-immersed type equipment shall be used on the condition that there is no
vibration or inclination and the installation condition is stable.
5.3.2 If non-explosion protection equipment is used as cross-wall mechanical
transmission, the following regulations shall be met.
5.3.3 In addition to intrinsic safe circuit, the circuit and equipment in the explosive
atmosphere shall be installed with overload, short-circuit and grounding protection
devices. As to the equipment which is impossible to have overload problem, it is not
necessarily to be installed with overload protection device.
5.3.4 Under emergency circumstance, take one or more measures at the appropriate
site beyond the boundary of the hazardous area to turn off the equipment in the
hazardous area. The continuously operating equipment is not included in the
emergency shutdown circuit. The equipment shall be installed in the independent
circuit to prevent additional possible hazards.
5.3.5 Substation, distribution substation and control room shall be designed in
accordance with the following regulations.
5.4 Design of electrical wiring in explosive atmosphere
5.4.1 Cable and wire in the explosive atmosphere shall be selected in accordance with
the following regulations.
5.4.2 The circuit in the explosive atmosphere shall be protected in accordance with the
following regulations.
5.4.3 The electrical wire in the explosive atmosphere shall be installed in accordance
with the following regulations.
5.5 Grounding design in explosive atmosphere
5.5.3 The protective grounding of the electrical equipment in the explosive atmosphere
shall conform to the following regulation.
5.5.4 The grounding device of equipment shall be separated from the grounding device
of independent lightning rod which prevents direct lightning. It can be amalgamated
with the lightning rod installed on the building which prevents direct lightning. It can
also be amalgamated with the grounding device which prevents lightning induction.
Select the device with the lowest grounding resistance value.
5.5.5 Metal parts in Area 0 and 20 are not appropriate to adopt cathodic protection. If
cathodic protection is used, special design shall be adopted. Insulated parts requiring
for cathodic protection shall be installed outside the explosive atmosphere.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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