This standard specifies the environmental parameters and severity levels encountered by products used on the ground during normal use (including installation, shutdown and maintenance, etc.). This standard applies to electrical and electronic products used in places without weather protection and fixed installation on the ground under normal circumstances. It does not apply to environments caused by fire, explosion, ionizing radiation and other unexpected accidents, as well as microclimate conditions inside the product. GB/T 4798.4-1990 Environmental conditions for the application of electrical and electronic products Fixed use in places without weather protection GB/T4798.4-1990 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Environmental conditions for electric and electronic products
Stationary use at non-weather-protected locations
Environmental conditions existing in the applicationfor electric and electronic productsStationary use at non-weather-protected locationsGB 4798.4—90
This standard adopts IEC721—3--4 "Classification and grading of environmental parameters and their severity groups Stationary use at non-weather-protected locations" 1 Subject content and scope of application
This standard specifies the environmental parameters and severity levels encountered by products used on the ground in normal use (including installation, shutdown and maintenance, etc.)
This standard applies to electric and electronic products that are fixedly installed on the ground in non-weather-protected locations under normal circumstances. It does not apply to environments caused by fire, explosion, ionizing radiation and other unexpected accidents, as well as microclimate conditions inside the product. 2 Reference standards
GB4796 Classification of environmental parameters for electrical and electronic products and their severity classification GB4797.1 Temperature and humidity of natural environmental conditions for electrical and electronic products GB4798.10 Environmental conditions for application of electrical and electronic products Introduction 3 Terms
3.1 This standard adopts the definitions in Chapter 3 of GB4796. 3.2 Stationary use
The product is firmly mounted on a structural frame or installed on a device, or is placed in a certain position for a long time and is not used in a mobile manner. However, it includes the trial use during installation, short-term use during shutdown, maintenance, servicing and repair during normal use. 3.3 Location which is non-weather-protected This location does not have any protective facilities and cannot prevent the direct impact of the climate. 4 Classification and grades of environmental parameters
4.1 Classification of environmental parameters
4.1.1 The classification number of environmental conditions specified in this standard is 4. 4.1.2 The classification and codes of various environmental conditions specified in this standard are as follows: a.
Climatic conditions (K);
Special climatic conditions (Z);
Biological conditions (B);
Chemically active substance conditions (C);
Mechanically active substance conditions (S);
Approved by the State Administration of Technical Supervision on November 4, 1990 162
Implementation on July 1, 1991
Mechanical conditions (M).
GB 4798.4—90
4.1.3 Products are used in different climate types and are affected by environmental conditions to different degrees. Therefore, this standard specifies grades for the severity of environmental conditions, and a larger grade number indicates a higher severity. Generally, the severity level includes the severity level of the lower level. 4.1.4 For a fixed place of use or product, all levels that have an impact should be indicated, for example: 4K2/4Z1/4Z4/4Z6/4B1/4C2/4S2/4M4. See Appendix C for application examples. 4.1.5 For some parameters in this standard, it is not possible to quantitatively specify the severity level, but only qualitatively specify the severity level for typical parameters. For example: 4.3 Biological conditions.
4.2 Climate conditions
4.2.1 See Table 1 for climate conditions and their levels. See Table 2 for special climate conditions.
4.2.3 See Appendix B Climate Chart (Figures B1 to B8) for the relationship between relative humidity and absolute humidity and their corresponding ranges. 4.3 Biological conditions
Biological conditions only give typical parameters, without giving quantitative severity values. The levels of biological conditions are shown in Table 3. 4.4 Chemically active substances conditions
4.4.1 Chemically active substances are mainly chemical substances discharged from industrial production, motor vehicles and heating systems, as well as salt spray, which will affect the performance of electrical and electronic products and materials. According to the short-term and long-term effects of chemically active substances, this standard specifies the maximum and average values. 4.4.2 Chemically active substances parameters and their levels are shown in Table 4. 4.4.3 Levels 4C1 and 4C2 in Table 4 are required to be adopted in the whole column. 4C3 and 4C4 are not required to be adopted in the whole column. The necessary single parameters and levels can be selected as needed, but the values ​​of other parameters should meet the requirements of level 4C2. 4.5 Mechanically active substances conditions
Sand and dust have similar effects on products, so this standard classifies them into one category. Its levels are shown in Table 5. 4.6 Mechanical conditions
4.6.1 This standard uses the magnitude of acceleration and displacement to specify the sinusoidal steady-state vibration level in the low-frequency and high-frequency ranges, without considering random vibration. If there is sufficient random vibration data, it can also be considered. 4.6.2 This standard uses the maximum undamped impact response spectrum to specify the level of non-steady-state vibration including impact. See Article 5.3.1 of GB1796.
4.6.3 Mechanical environmental parameters and their levels are shown in Table 6. The typical impact response spectrum is shown in Figure 1. Table 1 Levels of climatic conditions
Environmental parameters
c. Low relative humidity
d. High relative humidity
c. Low absolute humidity
f. High absolute humidity
g. Temperature change rate
h. Low air pressure
i. High air pressure
Solar radiation
k. Thermal radiation
1. Surrounding air movement
n. Precipitation conditions (rain, snow, shark, etc.) ）
o. Rainfall intensity
p. Rainwater temperature
q. Other water sources besides Li
r. Ice and box conditions
mm/min
GB4798.4—90
Continued Table 1
Note: () Low and high relative humidity are limited by low and high absolute temperature. Therefore, for environmental parameters a and/or b and d, the severity levels specified in Table 1 will not appear at the same time. Refer to Appendix B for the relationship between air temperature and humidity. ② The temperature change rate is averaged over 5 minutes. ③ 70kPa represents the limit for outdoor use, usually at an altitude of about 3000m. Products with low air pressure values ​​that have a great impact on high-voltage external insulation and temperature rise may be specified in accordance with relevant standards.
) Rainwater temperature should be considered together with air temperature and solar radiation, and the cooling effect of rainwater should be linked to the surface temperature of the product. () Special climatic conditions are selected from Table 2.
③ Grades 4K4, AK4L, and 4K4H are only used in international exchanges. ?）For international exchanges, the medium and high absolute humidity of grade 4K3 is allowed to be 36g/m. Table 2 Levels of special climatic conditions
Heat radiation
Circumferential air movement
Other water sources except rain
Special conditions
Unit
Special conditions
Can be ignored
There are heat radiation conditions, such as due to production conditions 20
Can be ignored
Splashing conditions
Water spraying conditions
Water wave conditions
Environmental parameters
Environmental parameters
a. Salt (sea salt and land
b. Sulfur dioxide
C, hydrogen sulfide
e. Ammonium chloride
f. Hydrogen fluoride
. Nitrogen oxides (including
nitrogen oxides)
Hormones, fungi, etc.
GB 4798.4—90
Grade of biological conditions
Rodents and other animals that endanger products, except termitesGrade
Fungi, fungi, etc.
Rodents and other animals that endanger products, including termitesTable 4 Grade of chemical active substance conditions
Maximum value
cm//m3
cm\/m2
cm2/m2
crm2/m2
Note: () Salt only considers sea salt and land salt. Average value
Maximum value
Average value
Maximum value
(②) The average value is the average value of the long-term value. The maximum value is the limit value or peak value that does not exceed 30 minutes per day Table 5 Level of mechanically active material conditions
Environmental parameters
Dust (floating)
Dust (deposited)
Average value
Maximum value
Sinusoidal steady-state vibration
Unsteady-state vibration (including shock)
Environmental parameters
Acceleration
Frequency range
Shock response spectrum L
Peak acceleration a
Shock response spectrum I
Peak acceleration a
Shock response spectrum II
Peak acceleration a
9～200||t t||GB4798.490
Grade of mechanical conditions
9～200
9～200
9~~200
Figure 1 Typical shock response spectrum
(First maximum shock response spectrum)
Spectrum type L:
Spectrum type I:
Spectrum type II:
Duration is 22ms
Duration is 11ms
Duration is 6ms
9~~200
9～200
Cheek frequency (Hz)
A1 Description
GB 4798.4
Appendix A
Instructions for selecting environmental conditions and their levels
(reference)
This appendix classifies the places where the product is used, explains how to correctly select environmental conditions and their levels, and gives examples.
A2 Conditions
The climate types in this appendix are in accordance with the provisions of GB4797.1. When the product selects the climate condition level in this standard, the product's use place and its climate type should be considered. A2.1
The climate types of my country and the world as stipulated in GB1797.1 and their codes are shown in Table A1. Table A Climate types and codes
Climate types
Cold and warm,
Sub-humid heat
Extreme cold
Moderate dry heat
Extreme dry heat
Constant humid heat
A 2.2 This standard specifies various environmental conditions and their codes. The climatic conditions are divided into 8 levels: 4K1, 4K2, 4K3, 4K3H, 4K3L, 4K4, 4K4H, 4K4L, a total of 8 levels; the special climatic conditions are divided into 9 levels: 4Z1, 4Z2, 4Z3, 4Z4, 4Z5, 4Z6, 4Z7, 4Z8, 4Z9; the biological conditions are divided into 2 levels: 4B1, 4B2; the chemical conditions are divided into 2 levels: 4B1, 4B2; the Active material condition levels are divided into: 4C1, 4C2, 4C3, 4C4, a total of 4 levels; mechanical active material condition levels are divided into: 4S1, 4S2, 4S3, 4S4, a total of 4 levels; mechanical condition levels are divided into: 4M1, 4M2, 4M3, 4M4, 4M5, 4M6, 4M7, 1M8, a total of 8 levels. A2.3 The codes of environmental condition levels are arranged in order from low to high according to the severity of environmental parameters. Large numbers indicate high severity, for example: Level 4K3 is more severe than 4K2. A2.4 Climate conditions
A2.4.1 Climate conditions related to climate type When selecting the environmental condition level, the climate type should be considered. The climate type of the place of use is marked with the symbol × in Table A2. 167
Climate parameters and
Places of use
Low temperature, ℃
Places directly exposed to the outdoor
climate
High temperature, ℃
Places directly exposed to the Guangwai
climate
Low relative humidity, %
Places directly exposed to the outdoor
climate
High relative humidity, %
Places directly exposed to the outdoor
climate
Low absolute humidity, B/m3
Places directly exposed to the outdoor
climate
High absolute humidity, %
Places directly exposed to the outdoor
climate
China
GB 4798.4—90
Climate type
World boundary
Subhumid Extremely cold Cold Warm
Cold Cold Warm Dry
Cold Warm Warm Hot Cold Warm Warm
X|xx|x
X/x/x/x/x
xxxxxx
×xx×|x|x|x
×|x|×|x|x|x|x×|
×××x
xIx|x|x||tt| |Degradation strength, mm/min
Places directly exposed to ××
outdoor climate××
IX|xx|x
XIXIXX
XIXIXIXXXIXI
（+35)
+40+40
(36）
4K4LK4H
0.0030.003
A2.4.2 Climatic conditions independent of climate type GB 4798.4—90
The following conditions apply to direct exposure to 8 (4K1～4K4L) outdoor climate levels, independent of climate type. g. Temperature change rate
h. Low pressure
i. High pressure
j. Solar radiation
k. Thermal radiation
1. Surrounding air movement
n. Precipitation conditions (rain, snow, electricity, etc.)
p. Rainwater temperature
9. Other water sources besides rain
r. Freezing and frost conditions
A2.5 Biological conditions
0. 5'C/min;
70kPa;
106kPa;
1 120W/m;
See Table 2 (special climatic conditions);
See Table 2 (special climatic conditions);
See Table 2 (special climatic conditions);
See Table A3 for the selection of biological conditions and their levels in the places where the products are used. Table A3
Biological parameters and places of usebzxZ.net
Products are damaged by mold, fungi, etc. without protection
Products are damaged by rodents and other animals without protection, excluding termitesProducts are damaged by rodents and other animals without protection, including termites
A2.6 Chemically active substance conditions
Mold, fungi, etc.
Rodents and other animals that damage the product, excluding termites
For a selection of the chemical conditions and their levels encountered in the place of use of the product, see Table A4. Grade
Mold, fungus, etc.
Rodents and other animals that endanger products, including termites
Chemical parameters and
Places of use
Sulfur dioxide
Hydrogen sulfide
Hydrogen nitride
Hydrogen fluoride
Nitrogen oxide
In rural areas or places with a small amount of industrial pollution
Cities and places with light traffic
Cities with industrial pollution or heavy traffic
In places close to industrial chemical pollution sources
In industrial areas with high concentrations of chemical pollution
Maximum value
Average value
4798.4—90
Maximum value
Average value
Maximum value
Average value
Maximum value
Note: When 4C3 and 4C4 grades do not require consideration of all parameters, the necessary individual parameters and grades can be selected as needed, but the values ​​of other parameters should meet the requirements of 4C2.
Conditions for mechanically active substances
Selection of mechanically active substances and their grades in the product use site is shown in Table A5. Table A5
Mechanically active substances
Parameters and their locations
Dust (floating)
Dust (deposited)
mg/m2d
Mechanically active substances
Parameters and their locations
Rural areas not close to sand sources
Locations close to sand or dust sources
Locations where sand and dust are generated and there is a large amount of wind-blown sand or dust in the air
Locations with high concentrations of sand or dust due to geographical conditions or production conditions
A2.8 Mechanical conditions
GB 4798.4-90
Continued Table A5
For the selection of vibration and impact parameters and their levels encountered by the product during use, please see Table A6. Table A6
Environmental parameters and their
Sinusoidal steady-state vibration
Acceleration
Frequency range
Vibration places where vibration can be effectively prevented
Vibration places caused by machines or moving vehicles
Places where the product is directly installed on machines that generate vibration
Steady-state vibration (including Shen City)
Shock response spectrum L
Peak acceleration a
Shock response spectrum I
Peak acceleration a
Shock response spectrum II
Peak acceleration a
Places where shock can be effectively prevented
9～200
9～200
9~~200
9～200
Environmental parameters and their
Impact locations caused by blasting and piling on the ground
Impact locations with high energy caused by machines, conveyor belts, etc.
Examples of application of A3 environmental conditions
A3.1 Application instructions for climate condition levels
GB4798.4—90
Continued Table A6
The product is used in different climate types and different places. For how to select the parameters and levels of climate conditions, see Table A2. 4K1 This level is used in places without climate protection and directly exposed to warm temperature and the world's warm temperature (WT) climate type. 4M7
4K2 This level is used without weather protection and is directly exposed to cold and warm, warm and dry heat, sub-humid heat and the corresponding world climate types in Table A1.
4K3 This level is used without weather protection and is directly exposed to cold, cold and warm, warm and dry heat, sub-humid heat, humid heat and the corresponding world climate types in Table A1 and constant humid heat (WDaE) climate types. 4K3L This level is used without weather protection and is directly exposed to cold, cold and warm, dry heat and warm climate types. 4K3H This level is used without weather protection and is directly exposed to warm and sub-humid heat and humid heat climate types. 4K4 This level is used without weather protection and is directly exposed to extreme cold (EC) cold (C), cold temperature (CT), warm temperature (WT), dry heat (WDr), moderate dry heat (MWDr), extremely dry heat (EWDr), humid heat (WDa), constant humid heat (WDaE) climate types in the world. 4K4L This grade is used in the climate types of extreme cold (EC), cold (C), cold temperature (CT), and warm temperature (WT) without weather protection.
4K4H This grade is used in the climate types of warm temperature (WT), dry heat (WDr), medium dry heat (MWDr), extremely dry heat (EWDr), humid heat (WDa), and constant humid heat (WDaE) without weather protection. In the above climatic conditions, the special conditions of heat radiation, ambient air movement and other water sources other than rain in the place of use of the product are selected according to the provisions of Table 2.
A3.2 Application instructions for biological condition grades
4B1 This grade is used in places with mold growth and animal damage excluding termites. 4B2 This grade is used in places with mold growth and animal damage including termites. A3.3 Application instructions for chemical active substance condition grades 4C1 This grade is used in rural and urban areas with less industrial active substances and medium transportation. 4C2 This grade is used in areas with a general degree of pollution, where industrial active substances are distributed throughout the area, or in towns with heavy traffic. 4C3 This grade is used in places close to chemical pollution sources from industrial production. 4C4 This grade is used inside industrial production workshops where high concentrations of chemical pollutants may appear. A3.4 Application instructions for mechanical active substance condition grades 4S1 This grade is used in rural areas that are not close to sand sources. 4S2 This grade is used in areas with sand or dust sources. 4S3 This grade is used in areas with sand or dust in the air due to geographical location 4S4 This grade is used in areas where the air often contains high levels of sand and dust due to geographical or production conditions. A3.5 Application instructions for mechanical condition grades
GB4798.4--90
This grade is used in places that can prevent obvious vibration and impact. This grade is used in places that can prevent obvious vibration but can be impacted by blasting, piling, etc. 4M3
This level is used in places with vibration caused by machines or moving vehicles, or places with impact caused by blasting, piling, etc. 1M4
This level is used in places with vibration caused by machines or moving vehicles, or large energy impact caused by nearby machines, conveyor belts, etc. This level is used in places where the product is directly installed on the machine and large energy vibration and impact caused by the machine itself. Appendix B
Climate diagram
(reference)
Figures B1 to B8 show the relationship between air temperature, relative humidity and absolute humidity in grades 4K1 to K1 in the standard. eeseeee
Note: The dotted line is the world type.
Figure BI4K1 level climate diagram
Absolute air humidity (g/m\)
Air temperature (C)4—90
Continued Table A6
The product is used in different climate types and different places. See Table A2 for how to select the parameters and grades of climate conditions. 4K1This grade is used without weather protection and directly exposed to warm temperature and the world's warm temperature (WT) climate type. 4M7
4K2This grade is used without weather protection and directly exposed to cold temperature, warm temperature, dry heat, sub-humid heat and the corresponding world climate types in Table A1.
4K3This grade is used without weather protection and directly exposed to cold, cold temperature, warm temperature, dry heat, sub-humid heat, humid heat and the corresponding world climate types in Table A1 and constant humid heat (WDaE) climate type. 4K3LThis grade is used without weather protection and directly exposed to cold, cold temperature, dry heat and warm temperature climate types. 4K3HThis grade is used without weather protection and directly exposed to warm temperature, sub-humid heat and humid heat climate types. 4K4This grade is used without weather protection and is directly exposed to the world's extreme cold (EC), cold (C), cold temperature (CT), warm temperature (WT), dry heat (WDr), moderate dry heat (MWDr), extremely dry heat (EWDr), humid heat (WDa), and constant humid heat (WDaE) climate types. 4K4LThis grade is used without weather protection and is directly exposed to the world's extreme cold (EC), cold (C), cold temperature (CT), and warm temperature (WT) climate types.
4K4HThis grade is used without weather protection and is directly exposed to the world's warm temperature (WT), dry heat (WDr), moderate dry heat (MWDr), extremely dry heat (EWDr), humid heat (WDa), and constant humid heat (WDaE) climate types. In the above-mentioned climatic conditions, the special conditions of thermal radiation, ambient air movement, and other water sources other than rain to which the product is subjected in the place of use shall be selected according to the provisions of Table 2.
A3.2 Application Notes for Biological Condition Levels
4B1 This level applies to sites with mold growth and animal damage, excluding termites. 4B2 This level applies to sites with mold growth and animal damage, including termites. A3.3 Application Notes for Chemically Active Substance Condition Levels4C1 This level applies to rural and urban areas with less industrially active substances and moderate traffic. 4C2 This level applies to areas with average pollution, industrially active substances distributed throughout the area, or towns with heavy traffic. 4C3 This level applies to sites close to chemical pollution sources from industrial production. 4C4 This level applies to the interior of industrial production workshops, where high concentrations of chemical pollutants may occur. A3.4 Application Notes for Mechanically Active Substance Condition Levels4S1 This level applies to rural areas not close to sand sources. 4S2 This level applies to areas with sand or dust sources. 4S3 This grade is used in areas with sand or dust in the air due to geographical location. 4S4 Wood grade is used in areas with high sand and dust in the air due to geographical or production conditions. A3.5 Application instructions for mechanical condition grades
GB4798.4--90
This grade is used in places where obvious vibration and impact can be prevented. This grade is used in places where obvious vibration can be prevented, but can be subjected to impact caused by blasting, piling, etc. 4M3
This grade is used in places with vibration caused by machines or moving vehicles, or places with impact caused by blasting, piling, etc. 1M4
This grade is used in places with vibration caused by machines or moving vehicles or large energy impact caused by nearby machines, conveyor belts, etc. This grade is used in places where the product is directly installed on the machine and large energy vibration and impact caused by the machine itself. Appendix B
Climate diagram
(reference)
Figures B1 to B8 show the relationship between air temperature, relative humidity and absolute humidity in grades 4K1 to K1 in the standard. eeseeee
Note: The dotted line is the world type.
Figure B14K1 grade climate diagram
Absolute air humidity (g/m\)
Air temperature (C)4—90
Continued Table A6
The product is used in different climate types and different places. See Table A2 for how to select the parameters and grades of climate conditions. 4K1This grade is used without weather protection and directly exposed to warm temperature and the world's warm temperature (WT) climate type. 4M7
4K2This grade is used without weather protection and directly exposed to cold temperature, warm temperature, dry heat, sub-humid heat and the corresponding world climate types in Table A1.
4K3This grade is used without weather protection and directly exposed to cold, cold temperature, warm temperature, dry heat, sub-humid heat, humid heat and the corresponding world climate types in Table A1 and constant humid heat (WDaE) climate type. 4K3LThis grade is used without weather protection and directly exposed to cold, cold temperature, dry heat and warm temperature climate types. 4K3HThis grade is used without weather protection and directly exposed to warm temperature, sub-humid heat and humid heat climate types. 4K4This grade is used without weather protection and is directly exposed to the world's extreme cold (EC), cold (C), cold temperature (CT), warm temperature (WT), dry heat (WDr), moderate dry heat (MWDr), extremely dry heat (EWDr), humid heat (WDa), and constant humid heat (WDaE) climate types. 4K4LThis grade is used without weather protection and is directly exposed to the world's extreme cold (EC), cold (C), cold temperature (CT), and warm temperature (WT) climate types.
4K4HThis grade is used without weather protection and is directly exposed to the world's warm temperature (WT), dry heat (WDr), moderate dry heat (MWDr), extremely dry heat (EWDr), humid heat (WDa), and constant humid heat (WDaE) climate types. In the above-mentioned climatic conditions, the special conditions of thermal radiation, ambient air movement, and other water sources other than rain to which the product is subjected in the place of use shall be selected according to the provisions of Table 2.
A3.2 Application Notes for Biological Condition Levels
4B1 This level applies to sites with mold growth and animal damage, excluding termites. 4B2 This level applies to sites with mold growth and animal damage, including termites. A3.3 Application Notes for Chemically Active Substance Condition Levels4C1 This level applies to rural and urban areas with less industrially active substances and moderate traffic. 4C2 This level applies to areas with average pollution, industrially active substances distributed throughout the area, or towns with heavy traffic. 4C3 This level applies to sites close to chemical pollution sources from industrial production. 4C4 This level applies to the interior of industrial production workshops, where high concentrations of chemical pollutants may occur. A3.4 Application Notes for Mechanically Active Substance Condition Levels4S1 This level applies to rural areas not close to sand sources. 4S2 This level applies to areas with sand or dust sources. 4S3 This grade is used in areas with sand or dust in the air due to geographical location. 4S4 Wood grade is used in areas with high sand and dust in the air due to geographical or production conditions. A3.5 Application instructions for mechanical condition grades
GB4798.4--90
This grade is used in places where obvious vibration and impact can be prevented. This grade is used in places where obvious vibration can be prevented, but can be subjected to impact caused by blasting, piling, etc. 4M3
This grade is used in places with vibration caused by machines or moving vehicles, or places with impact caused by blasting, piling, etc. 1M4
This grade is used in places with vibration caused by machines or moving vehicles or large energy impact caused by nearby machines, conveyor belts, etc. This grade is used in places where the product is directly installed on the machine and large energy vibration and impact caused by the machine itself. Appendix B
Climate diagram
(reference)
Figures B1 to B8 show the relationship between air temperature, relative humidity and absolute humidity in grades 4K1 to K1 in the standard. eeseeee
Note: The dotted line is the world type.
Figure B14K1 grade climate diagram
Absolute air humidity (g/m\)
Air temperature (C)
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