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 weather-protected places that are fixed to the ground under normal conditions. 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 4798.3-1990 Environmental conditions for the application of electrical and electronic products Fixed use in weather-protected places GB4798.3-1990 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Environmental conditions for the application of electric and electronic products
Stationary use at weather-protected locations
Environmental conditions existing in the applicationfor electric and electronic productsStationary use at weather-protected locationsSubject content and scope of application
GB 4798.3- ​​90
This standard specifies the environmental parameters and their severity levels encountered by products for stationary use on the ground during normal use (including installation, shutdown and maintenance, etc.)
This standard applies to electric and electronic products that are fixedly installed on the ground in 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 electric and electronic products and their severity classification GB4797.1 Temperature and humidity of natural environmental conditions for electric and electronic products GB4798.10 Application environmental conditions for electric and electronic products Introduction 3 Terms
3.1 This standard adopts the definitions in Chapter 3 of GB4796. 3.2 Stationary use 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 for mobile use. However, it includes the trial use during installation, short-term use during shutdown, maintenance, care and repair during normal use. 3.3 Weather-protected location weather-protected location The place has protective facilities to prevent the direct impact of climate. 3.3.1 Totally weather-protected location (enclosed place) totally weather-protected location The place has protective facilities to prevent the direct impact of all climates. 3.3.2 Partially weather-protected location (sheltered location) The location has protective facilities that can prevent the direct impact of some climates. 4 Classification and levels of environmental parameters
4.1 Classification of environmental parameters
4.1.1 This standard stipulates that the environmental condition classification number is 3. 4.1.2 This standard stipulates the codes for various environmental conditions as follows: 8.
Climatic conditions (K)
Special climatic conditions (Z)
Approved by the State Bureau of Technical Supervision on November 4, 1990 122
Implementation on July 1, 1991
Biological conditions (B)
Chemically active substance conditions (C)
Mechanically active substance conditions (S)
f. Mechanical conditions (M)
GB4798.3--90
4.1.3 Based on the various environmental conditions encountered by the product during use, as well as the degree of influence of outdoor climate, building structure and production conditions, this standard stipulates various environmental condition levels. For example, for 3K1~3K8H, the larger the grade number, the higher the severity. -Generally, the higher severity includes the lower severity grades. 4.1.4 For a certain fixed place of use or product, all the grades that have an impact should be indicated. For example: 3K3/3B1/3C2/3S2/3M2/3Z1. For application examples, see Appendix C.
4.1.5 For some parameters in this standard, their severity levels cannot be quantitatively specified, but only the severity levels of typical parameters are qualitatively specified. For example, 4.3 Biological conditions.
4.2 Climate conditions
4.2.1 Climate conditions and their levels are shown in Table 1.123
GB4798.3-90
4.2.2 Levels of special climate conditions are shown in Table 2 Environmental parameters
Heat radiation
Ambient air movement
Other water source conditions other than rain
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Table 2 Levels of special climate conditions
Special conditions
Can be ignored
There are heat radiation conditions. For example, there are heat radiation conditions near the indoor heating system. For example, indoor heating systems or near industrial furnaces and commercial furnaces 10
Dripping conditions
Spraying conditions
Spraying conditions
4.2.3 The relationship between air temperature and relative humidity and their corresponding ranges are shown in Appendix B climate charts (Figure B1 Figure B13). 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. Table 3 Levels of biological conditions
Environmental parameters
4.4 Conditions for chemically active substancesbZxz.net
Mold, fungi, etc.
Mold, fungi, etc.
Rodents and other animals that endanger products, except termites
Rodents and other animals that endanger products, including termites
4.4.1 Chemically active substances are mainly chemical substances discharged by industrial production, motor vehicles and heating systems, as well as salt spray, which will affect the performance of materials of electrical and electronic products. According to the short-term and long-term effects of chemically active substances, this standard specifies the maximum and average values, parameters of chemically active substances and their levels in Table 4. 4.4.2
Table 4 Levels of chemically active substance conditions
Environmental parameters
Sulfur dioxide
Hydrogen sulfide
cm3/m3
cm3/m3
Maximum value
Average value
Maximum value||t t||Average value
Maximum value
With salt spray
Average value
Maximum value
Environmental parameters
Hydrogen chloride
Hydrogen fluoride
hOzone
iNitrogen oxide
cm*/m2
cm*/m*
cm2/ms
cm2/m3
Maximum value
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Continued Table 4
Average value
Maximum value
Average value
Maximum value
Note: ①The average value is the average value of the long-term value. The maximum value is the limit value within a period, not exceeding 30 minutes per day. Average value
Maximum value
②3C1 Salt spray can only exist in sheltered places in offshore and coastal areas, and there is no salt spray condition in other areas. 3C2~3C4 have salt spray conditions. ③3C1 and 3C2 require all environmental parameters in Table 4. 3C3 and 3C4 can be considered as single parameters, and the necessary parameters and levels are selected. It is not required to adopt them in full. However, other parameter values ​​should meet the requirements of 3C2. 4.5 Mechanically active substance conditions
Sand and dust have similar effects on products, so this standard classifies them into one category. The levels are shown in Table 5. Table 5 Levels of mechanically active material conditions
Mechanically active material
Dust (floating)
Dust (deposited)
4.6 Mechanical conditions
mg/(m2. d)
4.6.1 This standard specifies the level of sinusoidal steady-state vibration in the low-frequency and high-frequency ranges using the magnitude of acceleration and displacement, without considering random vibration. If there is sufficient random vibration data, it may also be considered. 4.6.2 This standard specifies the use of the first-level undamped maximum impact response spectrum, including the non-steady-state vibration level of impact. See Article 5.3.1 of GB4796.
4.6.3 See Table 6 for mechanical environmental parameters and their levels. The typical shock response spectrum is shown in Figure 1. 126
(including
acceleration
frequency range
shock response spectrum L
peak acceleration a
shock response spectrum
peak acceleration a
shock response spectrum
shock) Peak acceleration
Aa Large amount of acceleration
GB4798.3-90
Table 6 Level of mechanical conditions
9～~2009~～200
Frequency (Hz)
Figure 1 Typical shock response spectrum (the second maximum shock response spectrum) Spectrum type L Duration is 22ms
Spectrum type 1: Duration is 11 ms
Spectrum type II: duration is 6ms
9~~200
A1 description
GB4798.390
Appendix A
Instructions for selecting environmental condition levels
(reference)
This appendix classifies the places where products are used, explains how to correctly select environmental conditions and their levels, and lists examples. A2 Conditions
A2.1 The climate types in this appendix are in accordance with the provisions of GB4797.1. When a product selects the climate condition level in this standard, the place where the product is used and its climate type should be considered. According to the provisions of GB4797.1, the climate types of my country and the world types and their codes are shown in Table A1. Table A1 Climate types and codes
Subhumid heat
Extreme cold
Moderate dry heat
Extreme dry heat
Constant humid heat
World type
A2.2 This standard specifies various environmental conditions and their codes. The climatic condition levels are divided into 13 levels, namely 3K1, 3K2, 3K3, 3K4, 3K5, 3K5L, 3K6, 3K6L, 3K7, 3K7L, 3K8, 3K8L, and 3K8H; the special climatic condition levels are divided into 10 levels, namely 3Z1, 3Z2, 3Z3, 3Z4, 3Z5, 3Z6, 3Z7, 3Z8, 3Z9, and 3Z10; the biological condition levels are divided into 3 levels, namely 31B1, 3B2, and 3B3; the chemically active substance condition levels are divided into 4 levels, namely 3C1, 3C2, 3C3, and 3C4; the mechanically active substance condition levels are divided into 4 levels, namely 3S1, 3S2, 3S3, and 3S4; the mechanical condition levels are divided into 8 levels, namely 3M1, 3M2, 3M3, 3M4, 3M5, 3M6, 3M7, and 3M8. A2.3 The codes of environmental condition levels are arranged in order from low to high according to the severity of the environmental parameters. The larger the code number, the higher the severity. For example, level 3K6 is more severe than level 3K5. A2.4 Climate type: When selecting the environmental condition level, it should be combined with the natural climate type in which it is located. In Table A2, the climate type is marked with an × on the right side of the column of the place of use. Therefore, the environmental condition level selected for the same type of place of use under different climate types is different. A2.5 Environmental condition level: The environmental condition level selected for each type of place of use is marked with an X under the level column in Table A2. The first × in the horizontal direction indicates the lowest level selected for the place. A3 Examples of application of environmental conditions
A3.1 Climate conditions: See Table A2 for how to select climate conditions and their levels for products in different climate types and different places of use. 128
Constant humid heat
Extremely dry heat
Medium equal heat
Dry heat
Sub-humid heat
GB 4798. 3-
One meter later“point
GB 4798.3- ​​90
Constant humid heat
Extremely dry heat
Medium dry heat
Sub-humid heat
One“point
Constant humid heat
Extremely dry heat
Medium dry heat
Sub-humid heat
GB 4798.3
Constant damp heat
Extremely dry heat
Moderately dry heat
Subhumid heat
Medical rice·Clinical
?Ge Feng
GB 4798.3---90
×××
Constant damp heat
Extremely dry heat
Moderately dry heat
Subhumid heat
GB 4798. 3-90
To install the end
Medical rice to "Clinical
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