This standard specifies the classification of environmental parameter groups and their severity levels encountered by products used in fixed places without weather protection during installation, shutdown, maintenance and repair. Products used in fixed places without weather protection, permanently or temporarily, include impact sites and offshore. Products used on and in vehicles are excluded. This standard specifies environmental conditions that are limited to those that directly affect product performance. Only environmental conditions of this type are considered. The impact of these environmental conditions on the product is not described. Environmental conditions caused by fire, explosion and ionizing radiation are not considered, nor are other unexpected accidents. In special cases, the probability of these factors occurring should be considered. The microclimate inside the product is not included. Fixed use in weather-protected places, portable and non-fixed use, vehicle and ship use, storage and transportation conditions are specified in other parts of GB/T4798. A limited number of environmental condition levels cover a wide range of application locations. Users of this standard should choose the lowest level that covers the expected use conditions. GB/T 4798.4-2007 Environmental conditions for application of electrical and electronic products Part 4: Fixed use in non-weather-protected locations GB/T4798.4-2007 standard download decompression password: www.bzxz.net
This part specifies the classification of environmental parameter groups and their severity levels encountered by products used in non-weather-protected locations during installation, shutdown, maintenance and repair. Products permanently or temporarily installed in non-weather-protected locations for fixed use, including impact sites and offshore. Products used on and in vehicles are excluded. This part specifies environmental conditions that are limited to those that directly affect product performance. Only environmental conditions of this type are considered. The impact of these environmental conditions on the product is not described. Environmental conditions caused by fire, explosion and ionizing radiation are not considered, nor are other unexpected incidents. In special cases, the probability of these factors occurring should be considered. The microclimate inside the product is not included. Fixed use in weather-protected locations, portable and non-fixed use, vehicle and ship use, storage and transportation conditions are specified in other parts of GB/T 4798. A limited number of environmental condition levels cover a wide range of application locations. Users of this standard should select the lowest level that covers the expected use conditions.
class="f14" style="padding-top:10px; padding-left:12px; padding-bottom:10px;"> GB/T4798 "Environmental conditions for the application of electric and electronic products" includes:
GB/T4798.1-2005 Environmental conditions for the application of electric and electronic products Part 1: Storage
GB/T4798.2-1996 Environmental conditions for the application of electric and electronic products Transport
GB/T4798.3-2007 Environmental conditions for the application of electric and electronic products Part 3: Stationary use in weather-protected places
GB/T4798.4-2007 Environmental conditions for the application of electric and electronic products Part 4: Stationary use in places without weather protection
GB/T4798.5-2007 Environmental conditions for the application of electric and electronic products Part 5: Use on ground vehicles
GB/T4798.6-1996 Environmental conditions for application of electric and electronic products - Shipboard
GB/T4798.7-2007 Environmental conditions for application of electric and electronic products - Part 7: Portable and non-stationary use
GB/T4798.9-1997 Environmental conditions for application of electric and electronic products - Microclimate inside the product
GB/T4798.10-1991 Environmental conditions for application of electric and electronic products Introduction
This part is GB/T4798.4-2007 modified to adopt IEC60721-3-4:1995 "Classification of environmental conditions Part 3: Classification of environmental parameters and classification of their severity Section 4: Fixed use in places without weather protection" and Amendment 1:1996 (English version).
This part is redrafted based on IEC60721-3-4:1995. Appendix F lists the comparison table between the chapter and article numbers of this part and those of IEC60721-3-4:1995.
Taking into account the national conditions of China, this part has been modified when adopting IEC60721-3-4:1995 and Amendment 1:1996. The technical and editorial differences have been incorporated into the text and marked with vertical lines in the margins of the clauses to which they refer. A list of these technical and editorial differences and their reasons is given in Appendix G for reference.
The main differences between this part and IEC60721-3-4:1995 are as follows:
---The foreword of IEC60721-3-4:1995 is deleted;
---The foreword of national standards is added;
---The definitions in Chapter 3 are deleted;
---4K3H and 4K3L grades are added;
---The text description of A.2.1.2 is modified to be expressed by climatic conditions that are not related to climate types in Table A.2;
---Appendix E, Appendix F and Appendix G are added.
This part is a revision of GB/T4798.4-1990. Compared with GB/T4798.4-1990, the main differences are as follows:
---Terms in Chapter 3 are deleted;
---Some values ​​in Table 1 and Table A.1 have changed. 4K1 adopts the IEC grade, and the grade values ​​of 4K3H and 4K3L are adjusted accordingly;
---Appendix A is rewritten;
---The upper and lower limits of the frequency of spectrum I and II in the typical impulse response spectrum are extended;
---The grade climate diagrams of Figures B.1 to B.8 in GB/T4798.4-1990 are replaced by the relationship diagram of temperature, relative humidity and absolute humidity in Figure B.1;
---Table A.1 is deleted, and the climate type of IEC is retained. Table E.1 gives the corresponding relationship between the climate types of national standards and IEC standards;
---The text description of A.2.1.2 is modified to be expressed by Table A.2 Climate conditions unrelated to climate types;
---Appendix D, Appendix E, Appendix F and Appendix G are added.
GB/T4798 is one of the series of standards for environmental conditions of electrical and electronic products. The following is the expected structure of these national standards and their corresponding international standards and the national standards that will be replaced.
a) GB/T4796-2001 Classification of environmental parameters for electric and electronic products and their severity classification (IEC60721-1:1990, replacing GB/T4796-1984)
b) GB/T4797.1-2005 Temperature and humidity of natural environmental conditions for electric and electronic products (IEC60721-2-1:2002, replacing GB/T4797.1-1984)
c) GB/T4797.2-2005 Altitude and air pressure, water depth and water pressure of natural environmental conditions for electric and electronic products (IEC60721-2-3:1987, replacing GB/T4797.2-1986)
d) GB/T4797.3-1986 Natural environmental conditions for electric and electronic products Biology (IEC60721-2-7)
e) GB/T4797.4-1989 Natural environmental conditions for electric and electronic products Solar radiation and temperature (IEC60721-2-4:2002)
f) GB/T4797.5-1992 Natural environmental conditions for electric and electronic products Precipitation and wind (IEC60721-2-2:1988)
g) GB/T4797.6-2001 Natural environmental conditions for electric and electronic products Dust, sand and salt spray (IEC60721-2-5:1991)
h) GB/T4798.1-2005 Application environmental conditions for electric and electronic products Part 1 i ) GB/T4798.2-1996
Environmental conditions for application of electric and electronic products - Transport (IEC60721-3-2, Amendment 1: 1991, Amendment 2)
j) GB/T4798.3-2007 Environmental conditions for application of electric and electronic products - Part 3: Stationary use in weather-protected locations (IEC60721-3-3: 2002, Replaces GB/T4798.3-1990) k) GB/T4798.4-2007
Environmental conditions for application of electric and electronic products - Part 4 Part: Stationary use in places without weather protection (IEC60721-3-4:1995, replacing GB/T4798.4-1990)
l) GB/T4798.5-2007 Environmental conditions for application of electric and electronic products Part 5: Use on ground vehicles (IEC60721-3-5:1987, replacing GB/T4798.5-1987)
m) GB/T4798.6-1996 Environmental conditions for application of electric and electronic products for marine use (IEC60721-3-6:1987, Amendment 1)
n) GB/T 4798.7-2007 Environmental conditions for application of electric and electronic products Part 7: Portable and non-stationary use (IEC60721-3-7:2002, replacing GB/T4798.7-1987)
o) GB/T4798.9-1997 Environmental conditions for application of electric and electronic products Microclimate inside the product (IEC60721-3-9:1993)
p) GB/T4798.10-1991 Introduction to environmental conditions for application of electric and electronic products (IEC60721-3-0:2002, Amendment 1)
q) GB/T11804-2005 Terminology for environmental conditions for application of electric and electronic products (replaces GB/T11804-1984)
Appendices A, B, C, D, E, F and G of this part are informative appendices.
This part is proposed by China Electrical Equipment Industry Association.
This part is under the jurisdiction of the National Technical Committee for Standardization of Environmental Conditions and Environmental Testing for Electric and Electronic Products (SAC/TC8).
The drafting units of this part: Standard Metrology Research Institute of the Ministry of Railways, National Track Weighing and Measuring Station.
The main drafters of this part: Zhang Yibing, Lu Lin, Li Jianying, Qian Yuelei.
The previous versions of the standards replaced by this part are:
--- GB/T4798.4-1990.

Foreword III
1 Scope 1
2 Normative references 1
3 General requirements 1
4 Classification of environmental parameter groups and their severity levels 2
5 Combination of environmental condition levels 3
Appendix A (Informative Appendix) Description of conditions affecting the selection of environmental parameters and severity levels 7
Appendix B (Informative Appendix) Diagram of the relationship between air temperature, relative humidity and absolute humidity 13
Appendix C (Informative Appendix) Application examples 15
Appendix D (Informative Appendix) Description of combined environmental conditions 17
Appendix E (Informative Appendix) Comparison table of climate types between national standards and IEC standards 18
Appendix F (Informative Appendix) Comparison of chapter and article numbers of this part with those of IEC60721-3-4:1995 19
Appendix G (Informative Appendix) Technical and editorial differences between this part and IEC60721-3-4:1995 and their causes 20

ICS19.040
National Standard of the People's Republic of China
GB/T4798.4—2007
Replaces GB/T4798.4—1990
Environmental conditions existing in the application of electric and electronic products
Part 4:Stationary use at non-weather-protected locations(IEC60721-3-4:1995andAmd1:1996,ClassificationofenviranmentalconditionsPart 3:Classification of groups of environmental parametersand their severitiesSection 4:Stationary use at non weather protectedlocations, Mo)
2007-07-13 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2008-03-01 Implementation
Normative requirements
General requirements
Classification of environmental parameter groups and their severity level groups
Appendix A (informative appendix)
Appendix B (informative appendix)||tt ||Appendix (Informative Appendix)
Appendix D (Informative Appendix)
Thanks to Dunaikang for printing materials
Appendix (Informative Appendix)
Appendix (Water Resources Appendix)
Conditions affecting environmental parameters and severity of winter weather, relative humidity and absolute humidity relationship diagram
Description of relevant environmental conditions
National standards and standard climate type table Comparison of the clause numbers of this part with the clause numbers of IFC80721-3-4:1935 GB/T 4798.4—2007
-1--- 18
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This part is different from IC6072131:1995. Technical differences and common reasons 20
CB/4798 Application environment conditions for electric and electronic products) Color package: GB/74798.［一2005中上中添加：All environmental conditions Part 1; Storage GR/ 4798.2 19a6
Application environment conditions for electric and electronic products Transportation GB/T 4798.4—2007
G3/7 1798, 3—2007
7 Environmental conditions for electrical and electronic products Part 3: Environmental conditions for use in places with air protection GB/4798.4-2007
Environmental conditions for electrical and electronic products Part 4: Environmental conditions for places without air protection GB/- 4798, 5—2007
Environmental conditions for electrical and electronic products Part 5: Environmental conditions for electrical and electronic products for use in vehicles and ships
GB/74798.613961
Environmental conditions for electrical and electronic products Part 7: Environmental conditions for carrying non-standard equipment GB/7 4798.7—2007
GB/～4798.8—1007 Environmental conditions for postpartum use Microclimate for postpartum comfort GB/4798.1913S1 Environmental conditions for electronic products: Introduction This part is a modification of GB/T4798.4—2007 and adopts 1FC6072134:199 Environmental conditions classification Part 3: Classification of environmental parameters and their severity classification Section 4: None This part is revised according to [IEC:6073184:1995. In Appendix F, a comparison table of the chapter and article numbers of this part and IEC6072194:1933 is provided. Taking into account the current national conditions, this part makes some modifications when adopting IEC60721-3-4:1.995 amendment 1:1SS6. The technical differences and editorial differences have been compiled into the main text and marked with vertical lines in the blank space of the pages of the clauses they involve. A table of these technical and editorial differences and their reasons is drawn in the appendix for reference: The main differences between this part and IFC697%134:1395 are as follows: In addition to the foreword of YEC60721-3-4, 1995: The foreword of the national international standard is added:
In addition to the definitions of Chapter 3!
Add 4K3H and 4K3L. Grade:
The text description of A.21.2 is modified to "Table A, 2 Climate conditions not related to climate type\Representation"; Appendix E, Appendix F and Appendix G are added. This part is a revision of 6B/T4798,4-1990. It is consistent with GB/ 4798,4-1930, the main differences are as follows: Explanation of the terms in many chapters;
Table 1 Table A, 1 The value of the score has changed. 4K.1 Adopts the IEC: grade, 4K.3H The 4K.3L. grade values ​​are adjusted accordingly:
Add Appendix A;
- Typical impact stress spectrum ", II spectrum frequency effect" lower limit Yan Tuo Shi "Figure B.1 humidity, relative humidity and absolute humidity, wheat relationship diagram \ replace GB/17S, 1-199]-1 Figure B. [Figure B, 8 grade climate reduction,;
Except Table A. ", retain the first climate category of C, Table E1 gives the national standard and IFC standard climate type Tai Mei Su:
A.21.2 The text of the period is modified to pressure Table A, 2 Climate conditions that are not related to the climate type are expressed: Add Appendix D, Appendix E, Appendix F and Appendix G (B/II 4798 series of standards for environmental conditions for electrical and electronic products The following lists the expected structure of these national standards and the corresponding international standards and the national standards that will be replaced. H
..comCB/T 4798.4-2007
a) GP/T 473s2001 Classification of environmental parameters for electronic products and their severity classification (IEC60721-1; 13S0, replacing GB/T 4795-1984)
GB/4797.12005 Natural environmental conditions for electronic products - temperature and humidity (IEC6721-2-1: 2002 replacing GB/T 4797.1-1981)
c) GB/T 4797.2 2005
5 Natural environmental conditions for electronic products - altitude and air, depth and humidity (IEC 60721-2-3 1957, replacing GB/T 4797.2—1986) GB/T4737.31S86 Natural environmental conditions for electric and electronic products IEC60721-2-7) GB/T 177, 177, 177-4-1a89 Natural environmental conditions for electric and electronic products (IEC 60721-24:2002) GB/T4737.5—1992 Natural environmental conditions for electric and electronic products - Precipitation and wind (IEC 80721-23:1988) GB/T1737.6—2001 Natural environmental conditions for products, sand and salt spray (IEC 60721-2-5:1981) GB/4798.12005 Environmental conditions for electric and electronic products Part 1: Storage (IEC 50721-3-0:1337, 46 GB/T 470S.1 168S)
GB/4793.219S6 Electrical and electronic products for transportation (IFC60721-3-2. Amendment 1:19S1. Amendment 2) (IEC 60721-3-2007 Electrical and electronic products for use in environmental conditions Part 3: Fixed use in places with air-conditioning (IEC 90721-3:2003, replacing GB/T 4738, 3-1399 GB/7798.1-2007 Electrical and electronic products for use in environmental conditions Part 4: Fixed use in places without air-conditioning (IEC 90721-3-4:1335, replacing GP/T 4798.4 19S0) GB/1 4798.52007 Electrical and electronic products for use in places with air-conditioning (IEC 90721-3-5:1336, replacing GP/T 4798.4 19S0) 4798.—1987)m.
Part 5: Vehicle use (IEC60721-3-GB/T 1738.6—[396] Electrical and Mechanical Engineering: Environmental conditions for product applications (IFC 60721-3-6:1987-Revision 1) G13/T 1795.7-2007 Electrical and Mechanical Engineering: Environmental conditions for product applications Part 7: Portable and non-stationary use (1EC 60721-3-7:2002, GP/T 4738. 713S7) 0GB7T 4798. 9-1997
Applied environment of electric and electronic products - Addition of product internal temperature (IFC07219:1383)
GB/T4733.10-1991 Introduction to application environment of electric and electronic products (IFC072199:2003, Amendment 1) GB/T [1801-2005] The product application environment conditions terminology (terms) in GB/T 11801-1981 are not included in the appendix A. Appendix, Appendix 1 and Appendix (Appendix) of GB/T 11801-1981. This part is proposed by the China Association of Electrical Equipment Manufacturers. This part is organized by the National Technical Committee for Standardization of Environmental Conditions and Environmental Tests for Electrical and Electronic Products (SAC/TC 8) This part was drafted by: Standard Metrology Research Institute of the Ministry of Railways, National Railway Weighing and Measuring Station. The main drafters of this part are: Zhang Bing, Lu Lin, Li Jianjue, Qian Yuelei. The previous versions of the standards represented by this part are: -G3/T 4798, 4663.
..com1Scope
Environmental conditions for application of electrical and electronic products
Part 4: Fixed use in places without weather protection GB/T4798.4—2007
This part specifies the classification of environmental parameter groups and their severity levels during installation, shutdown, maintenance and repair of products used in places without weather protection.
Products that are permanently or temporarily installed in places without weather protection for fixed use, including impact land and offshore. Products used on and in vehicles are excluded.
This part specifies environmental conditions that are limited to those that directly affect product performance. Only environmental conditions of this type are considered. The impact of these environmental conditions on the product is not described.
Environmental conditions caused by fire, explosion and ionizing radiation are not considered, and other unexpected accidental Even if there are accidents, they are not considered. In special cases, the probability of these factors occurring should be considered. The microclimate inside the product is not included.
Fixed use in weather-protected places, portable and non-fixed use, vehicle and ship use, storage and transportation conditions are specified in other parts of GB/T 479.
The environmental condition levels of a limited number of plates include a wide range of application locations. Users of this part should choose the lowest level that covers the expected conditions of use.
2 Normative references
The clauses in the following documents become clauses of this part through reference to this part of GB/T 4798. For all dated referenced documents, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For all undated referenced documents, the latest versions apply to this part.
GB/T4796—2001 Classification of environmental parameters for electric and electronic products and classification of their severity (idtIEC60721-1.1990) GB/T4797.1—2005 Temperature and humidity of natural environmental conditions for electric and electronic products (ncEC60721-2-1:2002, M0D) GB/T4798.102006 Introduction to application environmental conditions for electric and electronic products (IEC60721-3-0.2002, IDT) GB/T11804—2005 Terminology of environmental conditions for electric and electronic products 3 General requirements
This part is used simultaneously with GB/T479810—2006; the terms and definitions established in GB/T11804—2005 apply to this part. Installation usually stops work. The user should distinguish such situations from the use of the product. Unless otherwise specified, other levels should be selected at this time. The probability of exceeding the specified severity is very low. All specified values ​​are maximum or limit values. These values ​​may be reached, but they will not appear for a long time. The frequency of severity varies from place to place over a period of time. This standard does not consider such occurrence rates, but the frequency of occurrence of any environmental parameter should be considered. If necessary, additional provisions will be made. The frequency and period of occurrence are specified in GB/T4798.102006. It should be noted that the occurrence of several specified environmental parameters at the same time may increase the impact on the product. This is particularly obvious when biological conditions, chemical substances and mechanically active substances appear at high relative concentrations at the same time. The environmental conditions at a certain location may be affected by other factors, such as heat sources, special process conditions, etc. 1
..comGB/T 4798.4—2007
The measurement base of the environmental conditions at a certain location should be selected around the product. It should be recognized that there are extreme and special environmental conditions. Products used in such special environments shall be determined by negotiation between the supply and demand parties. 4 Classification of environmental parameter groups and their severity classification Tables 1 to 6 list a series of environmental condition levels: climatic conditions (K), special climatic conditions (Z), biological conditions (B), chemically active substances (C), mechanically active substances (S) and mechanical parts (M) The possible combination of environmental conditions encountered by the product constitutes a series of categories, representing the actual situation of worldwide application, depending on the outdoor climate, building structure, installation, process conditions, etc. Higher numerical environmental condition levels usually include lower numerical environmental condition levels. Some parameters cannot quantitatively specify the severity. For a given location and product, a set of grade combinations should be selected, such as: 5K2/4Z1/4Z4/4Z6/4B1/4C2/4S2/4M4 Appendix A explains the basis for the environmental condition grades, lists the use sites included in each grade, and gives the circumstances that affect the selection of environmental parameters and their severity.
The appendix includes a diagram of the relationship between air humidity, relative humidity and absolute humidity. Appendix C gives examples of the application of environmental parameter classification. 4.1 Climate conditions
The climate conditions specified in 4K1 to 4K4 refer to the outdoor climate group in CB/T 4797.1-2005. The temperature and humidity reference values ​​are annual averages.
In places without climate protection, the influence of special climate conditions on products and their components is greater than in places with climate protection. In particular, temperature changes, solar radiation, precipitation, air velocity, and cold wind should be considered in this case. These severity levels are affected by the structure of the system (e.g. material type and thickness, surface color, enclosure sealing or ventilation, product heat dissipation, etc.) and the specific installation (e.g. choice of installation site, exposure to climate and degree of ventilation, etc.). 4.2 Special climatic conditions
In practice, thermal radiation, ambient air movement, water from rainfall and low pressure parameters may occur simultaneously with other climatic conditions with arbitrary severity. Therefore, these parameters are specified in the special conditions of Table 2. In this case, assuming that several conditions with increasing severity occur simultaneously will lead to unreasonable design. 4.3 Biological conditions
No quantitative severity level is specified for biological conditions. The parameters specified are representative but not complete. 4.4 Chemically active substances
Natural pollution mainly comes from chemical emissions from industrial activities, driving vehicles and heating systems. More serious chemical pollution comes from sea salt smoke. The combination of chemical pollution will affect the materials and properties of the product. The values ​​given in the classification are the result of several years of observation. Since the direct impact of high concentrations in the short term can lead to more serious damage to materials or even make them irreversible, the maximum values ​​are given in the table. The average values ​​are given in addition because they play an important role in the long-term impact on the internal components of the product. In fact, it is impossible for all pollutants in this section to appear at the same time. Even if these pollutants appear at the same time and the concentration increases, the possibility is small. Different places often have only one type of pollution with a higher concentration. The specified values ​​of grade 4C1 correspond to rural areas. The specified values ​​of grade 4C2 correspond to urban areas. Therefore, the severity of these two grades meets the results of the combined effect of all parameters. The severity of grades 4C3 and 4C1 cannot be considered to meet the results of the combined effect of all parameters, otherwise it will lead to unreasonable design. For grades IC3 and 4Cl, only a single parameter corresponding to special use can be selected. In places where chemically active substances appear, a single parameter in grades 4C3 and 4C1 can be selected, and other parameters not mentioned can be selected from the values ​​in grade 4C2. Note: Chemically active substrates and chemically active solids other than sea salt and road salt are not considered in this section. 4.5 Mechanically active substances
Sand and dust are local environmental factors because their effects are similar. 2
..com4.6 Mechanical conditions
Sinusoidal vibration is classified according to acceleration and displacement amplitude, corresponding to different frequency ranges. Random vibration is not considered in this section and will be considered when sufficient data is available. GB/T 4798.4--2007
Non-steady-state exploration including shock is classified according to the first-level undamped maximum shock response spectrum, see GB/T47962001.5 Environmental condition level combination
The environmental condition group consists of a series of possible combinations of product environmental conditions. The number and flexibility of combinations are very large. In fact, this flexibility is not always beneficial. For example, when different parties discuss environmental condition documents, there will definitely be minor differences that interfere. In general, in order to avoid this possibility, select the severity level standard combination from Table 7. For a given location and product, refer to this part, for example, select IE12. Only when the standard does not include the required severity level combination, the environmental condition level combination can be selected according to Chapter 4. On the contrary, if the severity of some parameters is different from the level specified in the standard, the combination should be expressed as follows: "but... (parameter... <severity and unit)", for example, IE42 but sand is 30mg/m. Appendix D gives a description of the combined environmental conditions. Table 1 Climate condition level
Environmental parameters
Low relative humidity
Common relative humidity
Low absolute humidity
High absolute humidity
Rainfall intensity ||tt ||Temperature change rate
Low pressure
Solar radiation
Heat radiation
Ambient air pollution
Precipitation conditions (rain, fog, rain, etc.)
Rainwater temperature"
Other water sources besides rain
All freezing and condensation
mm/min
See Table 2
See Table 2
See Table 2
See Table 2
See Table 2
See Table 2
See Table 2
See Decline 2
See Table 2
See Table More
See Table 2
See Table 2
See Installation 2
See Table 2
See Table 2
See Table 2
See Installation 2
See Table 2
See Table 2
See Table 2
See Table 2
See Table 2
See Table 2
See Table 2
|See Table 2
See Table 2
Low and high relative fades are limited by low and high absolute fading. Therefore, for the environmental parameters "low fading and "low relative fading" or "high temperature and "high relative fading", the severity levels specified in Table 1 will not appear at the same time. See Table B for the relationship between air temperature and humidity. The temperature change rate is calculated as the average value over a period of smin. 70 kPa represents the limit for outdoor use, usually at sea level of about 3000 m. In some geographical areas, outdoor The use may be higher than 3000m. For some limited use below 3000m, the value can be obtained from Table 2. Rainwater temperature should be considered together with air humidity and solar radiation. The cooling effect of rainwater should be related to the product surface temperature 3
GB/T4798.4—2007
Environmental parameters
Low pressure
Ambient air pollution
Thermal radiation
Other water sources besides rain
Special climate Condition level
Thermal radiation may occur in special cases and should be considered if necessary. b
Underwater conditions are not considered.
4210 level corresponds to an altitude of about 1400m. c3 Biological condition level
Environmental parameters
Environmental parameters
Salt (sea salt and road salt)
Sulfur dioxide
Hydrogen
Oxygen oxides
, ether
Toxins Animals and other animals that endanger the product, except termites Special conditions
Negligible
Heat radiation generated by the production process
Negligible
Fungi, etc.
Rodents or other animals that endanger the product, including mosquitoes Table 4 Chemically active substances Condition Level
Tag/ra
cm\/m*
Ing/ra
cm'/m*
Maximum Average value of position
Maximum value of average valuebzxZ.net
Average value
Salt spray
Environmental parameters
Nitride (expressed as nitrogen oxides) unit
cm'/rn*
nagfms
Table 4 (continued)
Sensitive position
Note 1: The values ​​in this table are the maximum values ​​exceeding the minimum period per day. Note 2: The values ​​in the table are approximate average values.
Average value
Maximum value
Average value
Note 3: For the corresponding values ​​in cm/m (at 20 and 101.3 kPa), see Table 5 of GB/T47962001. Mechanically active material condition level
Environmental parameters
Sharpness (comfort)
(deposition)
Environmental parameters
Sinusoidal steady state vibration
Dynamic perturbation
Including shock
Acceleration| |tt||Frequency range
Impact response spectrum L
Acceleration peak
Impact response spectrum I
Acceleration peak 4
Impact response spectrum II
Acceleration peak
mg/(mt.h)
Mechanical condition level
+See Figure 1, for instructions, see GB/T4796—2001. 29
9--200
9--200
GB/T 4798.4—2007
Sensitive bit
Average value
Maximum bit
9--200
9-~200
GB/T4798.4—2007
Environmental system
Special climate
Chemically active substances
Machinery active substances
Frequency/chip
Sine pulse static time:
L: duration j22 ms;
Frequency: duration 11 ms;
Ray spectrum II: duration 6 ms,
7 Typical shock response spectrum
(First level fire shock response spectrum) Environmental level combination
Spot combination
A.1 General
Appendix A
【Informative Appendix】
Explanation of conditions affecting the selection of environmental parameters and severity GB/T 4798.4m2007
This appendix explains the basis of each level, gives the explanation of conditions affecting the selection of environmental parameters and severity, and also includes a summary of the components covered by each level.
A. 2 Explanation of conditions
For each environmental parameter, various possible use sites are given, which may constitute environmental conditions of different environmental levels. The environmental conditions of the use site are sorted in reverse order of severity. Table A1 to Table A, 5 refer to the environmental conditions of the use site. In the level column, "×" represents the level of the use site. The first "×" encountered from left to right is the lowest level for the place of use. The above steps for determining the appropriate level apply to all parts, but Table 1 gives additional factors for climate types, which should be noted when selecting the level.
Read vertically along the climate type column and horizontally along the place of use. The first \×\ encountered in the level column from the first "×" between the two is the lowest level covering the place of use. The climate types specified in IEC 60721-2-1 are as follows: Extreme cold (excluding the center of Antarctica), cold, warm, warm, dry, moderately dry, extremely dry, humid, and constant humid. The climate types of my country and their corresponding relationship with the climate types of IEC are shown in Appendix F. It should be pointed out that if a certain level covers a place of use in this appendix, this does not mean that every environmental parameter of the level constitutes the minimum environmental severity of the place of use. A.2.1 Climate conditions A.2.1.1 Climate conditions related to climate types Table A.1 describes the application list of climate environment parameters and places of use, climate types and climate condition levels. Table A.1 Climate conditions related to climate types Climate type Climate parameters and places of use Places directly exposed to outdoor air Temperature / Places directly exposed to outdoor air Moderate dry heat 50--65 °C GB/T4798.4-—2007
Atmospheric parameters
And places to be used
Low relative temperature/device
Direct exposure outdoors
Places under climate
High relative humidity/%
Direct exposure outdoors
Places under climate
Resistant absolute condensation/
(g/m*)
Direct zero road outdoors
Places below angstroms
Commercial absolute humidity/
Places directly exposed to
Rainfall intensity/
(mm/min)
Subhumid heat
Climate type
Table A.1 (continued)
Medium heat
Cold weather
×|xx|×!
x×xxx×xx×|×
Places directly exposed to||×
Climate
A. 2.1.2
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Climatic conditions independent of climate type
#K14K2
0.26:0.030.90.030, 00
Table A.2 gives the climatic parameters and levels for direct exposure to 8 types (4K1 to 4K4L) outdoors that are independent of the climate type. Table A.2 Climatic conditions independent of climate type Climate parameters
Rate of temperature change
Low pressure
High pressure
Solar radiation
Heat radiation
Ambient air movement
70; alternative values ​​see Table
Special conditions 2, see Table 2
Special conditions 2, see Table 2
List.
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