This part specifies the environmental parameter groups and their severity levels for portable and non-stationary use products (including relocation, shutdown, maintenance, and repair). The environmental conditions specified in this part do not distinguish between the various stages of product use, i.e., whether the product is only temporarily fixed in use during mobile and random conditions. The environmental conditions specified in this part are limited to those that can directly affect product performance. Only this type of environmental conditions are considered. The effect of environmental conditions on the product is not specifically stated. Environmental conditions such as fire, explosion, plasma radiation, etc. are not included, nor are all other unpredictable accidents. The probability of accidents should be considered in special occasions. Microclimate conditions inside the product are not included. For fixed use, vehicle, ship, storage and transportation environmental conditions, see other parts of GB/T4798. A limited number of environmental condition levels cover a wide range of application locations, and users of this part should choose the lowest level that can cover the expected use conditions. GB/T 4798.7-2007 Environmental conditions for application of electric and electronic products Part 7: Portable and non-stationary use GB/T4798.7-2007 standard download decompression password: www.bzxz.net
This part specifies the environmental parameter groups and their severity levels for portable and non-stationary use products (including relocation, shutdown, maintenance, and repair). The environmental conditions specified in this part do not distinguish between the various stages of product use, that is, in mobile and arbitrary states, whether the product is only temporarily fixed in use. The environmental conditions specified in this part are limited to those that can directly affect the performance of the product. Only this type of environmental conditions are considered. The effect of environmental conditions on the product is not specifically stated. Does not include environmental conditions such as fire, explosion, plasma radiation, etc., nor does it include all other unpredictable accidents. The probability of accidents should be considered in special occasions. Does not include microclimate conditions inside the product. For environmental conditions for fixed use, vehicles, ships, storage and transportation, please refer to other parts of GB/T4798. A limited number of environmental condition classes cover a wide range of applications. Users of this standard should select the lowest class that covers the expected conditions of use.
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 locations
GB/T4798.4-2007 Environmental conditions for the application of electric and electronic products Part 4: Stationary use in non-weather-protected locations
GB/T4798.5-2007 Environmental conditions for 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 for marine use
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/T4798.10-2006 Environmental conditions for application of electric and electronic products Introduction
This part is a modification of GB/T4798.7-2007 and adopts IEC60721-3-7:2002 "Classification of environmental conditions Part 3: Classification of environmental parameter groups and their severity Section 7: Portable and non-stationary use" (English version).
This part is redrafted based on IEC60721-3-7:2002. Appendix G lists the comparison of the chapter and article numbers
of this part with those of IEC60721-3-7:2002. Taking into account the national conditions of China, this part has been modified when adopting IEC60721-3-7:2002. The technical differences and editorial differences have been incorporated into the main 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 H for reference.
The main differences between this part and IEC60721-3-7:2002 are as follows:
---Deleted the foreword of IEC60721-3-7:2002;
---Added the foreword of national standards;
---Deleted Chapter 3 Definitions;
---Added Appendix F, Appendix G and Appendix H;
This part is a revision of GB/T4798.7-1987. Compared with the old version of the standard, the main differences are as follows:
---Deleted Chapter 2 Terminology;
---Added Table 7 Environmental Level Combinations;
---Extension of the upper and lower limits of the frequency of the I and II spectra in the typical impulse response spectrum;
---Deleted the duration and frequency of the original Appendix D;
---Deleted the method B in the original Appendix C;
--- Add Appendix D, Appendix E, Appendix F, Appendix G and Appendix H;
GB/T4798 is one of the series of standards for environmental conditions of electrical and electronic products. The following gives the expected structure of these national standards and their corresponding international standards and replaced national standards.
A) GB/T4796-2001 Classification and severity classification of environmental parameters for electric and electronic products (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 and Amendment 1.1987, 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 Biological (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 Environmental conditions for application of electrical and electronic products Part 1: Storage (IEC60721-3-1:1997, replacing GB/T4798.1-1986)
I) GB/T4798.2-1996 Environmental conditions for the application of electric and electronic products for transportation (IEC60721-3-2:1985, Amendment 1:1991, Amendment 2:1993)
J) GB/T4798.3-2007 Environmental conditions for the application of electric and electronic products Part 3: Stationary use in weather-protected locations (IEC60721-3-3:2002, replacing GB/T4798.3-1990)
K) GB/T4798.4-2007 Environmental conditions for the application of electric and electronic products Part 4: Stationary use in non-weather-protected locations (IEC60721-3-4:1995, replacing GB/T4798.4-1990)
L) GB/T4798.5-2007 Environmental conditions for the application of electric and electronic products Part 5: Use on ground vehicles (IEC60721-3-5:1997, replacing GB/T4798.5-1987)
M) GB/T4798.6-1996 Environmental conditions for the application of electric and electronic products for marine use (IEC60721-3-6:1987, Amendment 1)
N) GB/T 4798.7-2007 Environmental conditions for the 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 the application of electric and electronic products Microclimate inside the product (IEC60721-3-9:1993)
P) GB/T4798.10-2006 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, G and H 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).
Drafting units of this part: Standard Metrology Institute of the Ministry of Railways, National Railway Weighing and Weighing Station.
Main drafters of this part: Zhang Yibing, Lu Lin, Qian Yuelei, Li Jianying.
The previous versions of the standards replaced by this part are:
--- GB/T4798.7-1987.

The clauses in the following documents become the clauses of this part through reference in this part of GB/T4798. For all dated referenced documents, all subsequent amendments (excluding errata) or revised versions are not applicable to this part. However, parties to agreements 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 are applicable 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 (IEC60721-2-1:2002, MOD)
GB/T4798.2-1996 Environmental conditions for application of electric and electronic products Part 2: Transportation (NEQIEC60721-3-2:1985, Amendment 1.1991, Amendment 2:1993)
GB/T4798.3-2005 Environmental conditions for application of electric and electronic products Part 3: Stationary use in weather-protected locations (IEC60721-3-3:2002, MOD)
GB/T4798.4-2007 Environmental conditions for application of electric and electronic products Part 4: Stationary use in non-weather-protected locations (IEC60721-3-4:1995, MOD, Amendment 1:1996)
GB/T4798.10-2006 Introduction to environmental conditions for application of electric and electronic products (IEC60721-3-0:2002, IDT, Amendment 1)
GB/T11804-2005 Terminology of environmental conditions for electric and electronic products

Foreword III
1 Scope 1
2 Normative references 1
3 General requirements 2
4 Classification of environmental parameter groups and classification of their severity 2
5 Combination of environmental condition levels 3
Appendix A (Informative Appendix) Description of conditions affecting environmental parameters and selection of severity 8
A.1 General 8
A.2 Description of conditions 8
A.3 Description of grades 15
Appendix B (Informative) Relationship between air temperature, relative humidity and absolute humidity 17
Appendix C (Informative) Application examples 18
Appendix D (Informative) Description of combined environmental conditions 20
Appendix E (Informative) Description of environmental conditions in tropical areas specified for grades 7K6 and 7K7 21
Appendix F (Informative) Comparison table of climate types between national standards and IEC standards 23
Appendix G (Informative) Comparison of chapter and article numbers of this part with those of IEC60721-3-7:2002 24
Appendix H (Informative) Technical and editorial differences between this part and IEC60721-3-7:2002 and their causes 25

ICS19.040
National Standard of the People's Republic of China
GB/T4798.7—2007
Replaces GB/T4798.7-1987
Environmental conditions existing in the application of electricand electronic products-
Part 7.Portable and non-stationary use(IEC 60721-3-7:2002,Classification of environmental conditionsPart 3:Classification of groups of environmental parameters andtheir severities-Section 7:Portable and non stationary use use,MOD)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 material
General requirements
Classification of environmental parameters and their severity ratings
Environmental condition level groups
Table A (informative appendix)
Part description
Grade description
Acknowledgement B Information appendix
Appendix C
(Informative Appendix)
(Informative Appendix)
Appendix E
(Informative Appendix)
Appendix [(Informative Appendix)
Appendix G (Research Appendix)
Appendix II (Informative Appendix)
Conditions affecting environmental parameters and severity selection
Application examples
Description of environmental conditions
Explanation of thermal insulation conditions for grades 7K6 and 7K7 Comparison table of national and international climate types·GB/T 4798.72007
This part has the same clause number as IEC30721-3-7:2002. 0.0 and 11FC60721-3-72002 technical columns and differences and common reasons 24
CB/4798 Application environment for electric and electronic products (Part 1) GB/74798.1-2005 Environmental conditions for all products Part 1 GR/4798.2 19a6
G3/7 1798, 3—2007
Application environment for electric and electronic products (Transport) GB/T 4798.72007
Environmental conditions for electrical and electronic products Part 3: Environmental conditions for locations with weather protection GB/4798.42007
Environmental conditions for electrical and electronic products Part 4: Environmental conditions for locations without weather protection GB/- 4798, 5—2007
Environmental conditions for electrical and electronic products Part 5: Environmental conditions for electronic products for use in vehicles and ships
GB/7 4798.6 1306
GB/7 4798.7—2007E
Environmental conditions for electric and electronic products Part 7: Carrying and non-fixed environmental conditions GB/T 1798.1097 Environmental conditions for use and microclimate after production GB/4798.1920G9 Environmental conditions for electric and electronic products: Introduction This part is the revision of GB/T 1798.7—2007 and adopts IEC60721372002 Environmental conditions Classification Part 7: Environmental parameters classification and severity classification Section 7 (English version for non-fixed use). This part is based on [EC: 6073187:20:% and is re-written. Appendix G lists the comparison table between the chapter and article numbers of this part and the chapter and article numbers of IFC: 6072197:2092. Taking into account the national conditions of China, this part has made some modifications when adopting IFC 90721-3-7:2002: the relevant technical differences and supporting differences have been compiled into the text and marked with vertical lines in the blank space after the clauses they involve. A table of these technical and editorial differences and their reasons is given in the appendix for reference. The main differences between this part and IFC 6972137:2092 are as follows: In addition to the foreword of IFC 60721-3-7, 2002: The foreword of the national standard has been added: Chapter 1 Definitions has been deleted!
Add Appendix F, Appendix G and Appendix H:
This part is a revision of GB/T 1798,7-1987. Compared with the standard version, the following points are the same: Delete the second chapter of the technical specification:
-Add Table 7 Environmental grade:
Typical impact response spectrum, upper and lower limits of the spectrum, the duration and number of problems in the original Appendix ID\; Remove the method B in the original Appendix C;
Add Appendix D, Appendix E, Appendix F, Appendix G and Appendix H: GB/T 4798 is a series of standards for environmental conditions for electric and electronic products: The following gives the expected structure of these national standards and the common international standards and the previous national standards. a) GB/T 4798-2001 classifies environmental parameters for production and classifies their severity levels (IEC60721-1:1330, which is the successor to GB/T 1705—1984)
l) GB/4797.126G Electronics for natural environmental conditions of products - Temperature and humidity IF060721-2-1:2002 and amendment 1.1987 replace G13/T 1797.1-1984c) GB/T 47S7.22005 Electronics for natural environmental conditions of electronic products - Altitude and air pressure, water depth and water pressure (1EC 60721-2-31387, replace GB/- 4797.2-128)
d) GB/T 1737.3—1956 Natural environmental conditions of electronic products - Biologicals ([EC60721-2-7)H
..comCB/T 4798.7—2007
GP/T4707.413S91 Electrical products for natural environmental conditions solar radiation and temperature (IEC60721-2-4:2002) CB/T 4737.51992
Electrical products for natural environmental conditions precipitation and wind (IEC907211988) GP/T 4767.6 2001 1
Electrical products for natural environmental conditions such as precipitation and salt spray (IEC60721-2-511GB/T 1798,1—2005 Electrical products for application of environmental conditions Part 1: Busy storage (IEC 60721 No. 1:1997. Code h
GP/T 470S.11SS6)
GB/T 1798. 2-1986 Environmental conditions for the use of products for transport (IEC 6072-3-2; 1383, Amendment 1: 1351. Amendment 2: 1993)
GB173-007 specifies the environmental conditions for the use of products in climate-protected locations. Part 3: Use in airtight locations (IEC 80721-3-4: 135, replaces GP/T 4738 4 19S0)1) GB/47us. 5 2007 Electric 1. Environmental conditions for electric hand products Part 5: Use in vehicles, 1EC 6721-3-5:1997, replace GB/T4721-8.51987)
m) GB/T1798.6-1336 Environmental conditions for electrical and electronic products (IEC8072136:1987. Amendment D) GB/T 4798.7-2007
Environmental conditions for electrical and electronic products Part 7 New requirements for the use of non-standard products (IFC 6172[-3-7, 2012, replace GB/T 4798, 7-19871 GB/T4793.91997 Environmental conditions for the application of electrical and electronic products Micro-gas model inside the product (IEC039721-3-S:15531
B/T4738.10-3006 Introduction to environmental protection components for electrical and electronic products (1EC072129:200 Amendment 1) GB/T [[801-2015 Terminology for application of bad conditions for products (represented by GB/T [[S01-1981] Appendix A, Appendix B, Appendix D, Appendix E, Appendix F and Appendix C are data appendices. This part is proposed by the China Electrical Equipment Industry Association. This part was drafted by the National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products (National Technical Committee for Environmental Protection and Testing of Electrical and Electronic Products ( 7-1987.
..com1Scope
Environmental conditions for application of electrical and electronic products
Part 1: Portable and non-fixed use
GB/T 4798.7—2007
This part specifies the environmental parameter groups and their severity levels to which products for portable and non-fixed use (including relocation, shutdown for maintenance, and repair) are subjected.
The environmental parameter groups include the following environmental conditions: - Environmental conditions for short-term placement and use of products; - Changes in environmental conditions caused by changes in locations; - Environmental conditions for moving products between different locations. The environmental conditions specified in this part do not distinguish between the various stages of product use, i.e., in mobile and random states, and whether the product is only temporarily used in a fixed state.
Mobile and non-fixed use locations include land, near Sea, weather protection and non-weather protection places. Environmental conditions include mobile state, and mobile is part of carrying and non-fixed use. The environmental conditions specified in this section are limited to those that can directly affect the performance of the product. Only this type of environmental frame is considered. The effect of environmental cases on the product is not specifically stated.
Does not include environmental conditions such as fire, explosion, plasma radiation, etc., nor does it include all other unpredictable accidents. The probability of accidents should be considered in special occasions.
Does not include microclimate conditions inside the product. For fixed use, vehicles, ships, storage and transportation environmental conditions, see GB/T 4798 Other parts. A limited number of environmental condition levels cover a wide range of applications. Users of this part should select 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 in this part of B/T1798. For any dated referenced document, all subsequent amendments (excluding errata) or revised versions are not applicable to this part. However, parties to an agreement based on this part are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version applies to this part.
GB/T4796—2001 Electrical Classification of environmental parameters for electrical and electronic products and their severity classification (idtIEC60721-1:1990>GB/T4797.1--2005 Temperature and humidity of natural environmental conditions for electrical and electronic products (IEC60721-2-1:2002.MOD) GB/T1798.2-1996 Environmental conditions for application of electrical and electronic products Part 2: Transportation (nCqIEC60721-3-2:1985, Amendment 1.1991, Amendment 2:1993)
GB/T1798.3--2005 Environmental conditions for application of electrical and electronic products Part 3: Fixed use in weather-protected locations (IEC 60721-3-3:2002, MOD)
GB/T4798.4—2007 Environmental conditions for application of electric and electronic products Part 4: Stationary use in places without weather protection (IECG0721-3-4:1995, MOD, Amendment 1:1996) GB/T4798.10--2006 Introduction to environmental conditions for application of electric and electronic products (IEC60721-3-0:2002, IDT, Amendment 1) GB/T11801-2005 Terminology for environmental conditions for electric and electronic products 1
GB/T 4798.72007
3 General requirements
This part is used in conjunction with GB/T4798.102006; the terms and definitions established in GB/T11804-2005 apply to this part. Portable and non-fixed use products are sometimes moved from one place to another without being used. The environmental conditions during the move are not the same as those during use. If the environmental conditions during use need to be considered separately, a lower level can be selected. 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 occurrence of severity varies from place to place over a period of time. The frequency of occurrence of any environmental number should be considered. If screening is required, additional provisions will be made. The frequency and period of occurrence are specified in GB/T4798.10-2005. It should be noted that the combination of environmental parameters will increase the impact on the product. The conditions of biological components, chemical active substances and mechanical active substances are particularly obvious when accompanied by high humidity.
The environmental conditions at a certain location may be affected by other factors, such as heat sources, special process conditions, etc. The measurement of environmental conditions at a certain location should be carried out at the selected point around the product. It should be recognized that there are extreme and special environmental conditions. Products used in such special environments are determined by negotiation between the supply and demand parties. 4 Classification of environmental conditions and their severity classification Table 6 lists a series of levels: climatic conditions (K>, special climatic conditions (Z), biological conditions (B), chemically active substances (C), mechanically active substances (S) and mechanical conditions (M). The possible combinations of environmental conditions encountered by the product constitute a series of categories, representing the actual conditions of application in a wide range of fields, depending on the external climate, building structure, installation, process conditions, etc. Higher numerical environmental condition levels usually include lower numerical environmental condition levels. Some parameters cannot yet be determined to the maximum severity. For the clearly defined place of use and the determined product, a complete set of grade combinations should be selected, such as: 2K2/7Z1/724/7B1/7C2/7S1/7M4
Attached is an explanation The basis of the environmental conditions level. Describes the use places included in each level, and gives the conditions that affect the selection of environmental parameters and severity. Appendix B gives a diagram of the relationship between air leakage, relative humidity and absolute humidity. Appendix C gives three examples of the application of environmental parameter classification. 4.1 Climate conditions
The climate conditions specified in 7K1 to 7K5 are environmental conditions for carrying and non-standard use products. They are environmental conditions experienced for a long time worldwide, taking into account all parameters that can affect them, such as external (outdoor) climate conditions, building structure type, temperature, humidity control system, internal conditions and movement methods such as heat from other equipment, human activities, etc. These conditions take into account all normal conditions, but do not include special conditions. 7K6 Li 7 K7 specifies climatic conditions for tropical regions and is described in Appendix E. When selecting the appropriate level, it should be noted that the climate conditions inside the building depend on the external (outdoor) conditions, especially the air temperature, solar radiation and the type of building structure. Walls with good thermal insulation or high heat capacity are able to continuously balance the temperature changes during the day and night or even longer. Walls with poor insulation or poor thermal insulation have no such effect and the temperature differences are caused by solar radiation during the day and building heat generation at night. The effect of solar radiation is amplified by the heat collection effect and the greenhouse effect. In places without climate protection, the influence of special climatic conditions on the product and its main components is more obvious than in places with climate protection. In particular, factors such as temperature changes, solar radiation, precipitation, air flow speed, cool breezes, etc. should be taken into consideration. The severity of the above factors is affected by the specific conditions of the building (material type, thickness, surface color, room sealing, product heat dissipation, etc.) and the specific conditions of use (selection of installation site, wind and weather protection measures). 4.2 Special climatic conditions
Various degrees of thermal radiation, ambient air movement, other water sources outside the water, high temperatures and low pressure can be accompanied by other climatic conditions. Table 2 specifies these special climatic conditions. The occurrence of several events in parallel will increase the severity, and considering these will lead to unnecessary over-design.
4.3 Biological conditions
These conditions cannot be quantitatively specified. The special parameters in Table 3 are typical, but not necessarily complete. 4.4 Chemically active substances
GB/T 4798.7--2007
Natural pollution mainly comes from industrial activities, motor vehicles and heating system emissions. More serious chemical pollution comes from marine salt spray. These pollutants may affect the performance and materials of the product. The indicators given in the classification are based on several years of investigation. Since the direct impact of high concentrations of chemically active substances in a short period of time can cause more serious damage to materials and even make them irregenerative, the maximum values ​​are given in the table. The average value is given in addition because it has an important position for the long-term color response of the internal components of the product.
In fact, it is impossible for all pollutants in this part to appear at the same time. Even if these pollutants appear at the same time and the concentration increases uniformly, the possibility is small. In different places, usually only one pollutant has a high concentration. The values ​​specified in the 7C1 level correspond to rural areas and areas with low industrial activity. The values ​​specified in the 7C2 level correspond to urban areas. Therefore, the severity of these two levels meets the combined effect of all parameters. The severity of 7C3 and 7CA grades is not considered to meet the comprehensive effect of all parameters, otherwise it will lead to unreasonable design. For 7C3 and 7C4 grades, only a single parameter corresponding to the place of use can be selected. If a single parameter in 7C3 and 7C4 grades is selected, the values ​​of other parameters not mentioned can be selected in 3C2 grade.
Note: This section does not consider chemically active liquids other than sea salt and road salt. 4.5 Mechanically active substanceswwW.bzxz.Net
The effects of sand and dust on products are similar, so the two are combined. 4.6 Mechanical conditions
The magnitude of acceleration and displacement are used to specify the severity of sinusoidal steady-state vibration in the high-frequency and low-frequency ranges respectively. The power spectrum density of acceleration within the frequency range is used to represent the severity of random vibration. The first-level undamped maximum impact response spectrum is used to represent the severity of non-steady-state vibration including impact (see Figure 1). The drop height determined by the mass of the product is used to represent the severity of free fall. 5 Environmental condition level combinations
An environmental condition group consists of a series of possible combinations of product environmental conditions. The number and flexibility of combinations are very large. In practice, 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, a standard combination of severity levels is selected from Table 7. For a given location and product, this section can be referenced, for example, IF72 can be selected. Only when this section does not include the required severity level combination, a combination can be selected according to each level in the standard. If the severity of some parameters is different from the grade combination specified in the standard, the following phrase should be added: "but ... (parameter) (severity and unit)", for example, IE72 but sand is 30mg/m. Appendix D gives a description of the combined environmental conditions. 1 Climate condition level
Environmental parameters
Low relative humidity
High relative humidity
Low absolute humidity
High absolute condensation
Temperature change range
+5/+25
65/+30+5/+30
—5/+25
i - 25/-+ 30
-40/+30
—20/+30
GB/T 4798.7—2007
Environmental parameters
High atmospheric pressure"
Air pressure change rate
Zhaoyang volume
Around the country air pollution
Precipitation conditions
Precipitation conditions (rain, snow, etc.)
Precipitation intensity
Rainwater temperature
Other water sources besides rain
Water and soil conditions
kPa/emin
mm/min
Negligible
Table 1 (continued)
Negligible
Can be ignored
Can be ignored
The following are given in the table
Disease, low relative humidity, low temperature limit, so, for low temperature and low relative humidity or high temperature and high relative humidity, the severity cannot appear at the same time. The relationship between air temperature and humidity is shown in Appendix B. b70kPa generally indicates an altitude of 3000 + enterprise geographical location may have a higher humidity. Some restrictions are imposed on the use of low sea technical areas. Take the value from Table 2.
does not include mining conditions.
Here, the water temperature should be combined with high temperature and too light radiation. The cooling product surface temperature related to rainfall must be considered. The actual conditions of the site are selected from Table 2. The climate levels in this part include the data and benefits of GB/T 4798.2.GB/T 4798. 3 and GB/T 4798.4, the relationship is as follows: K1 includes 2K1 and 3K3, 7K3 includes 2K3, 3K6 and 4K1, 7K5 includes 2K5, 3K8 and 4K1, 7K2 includes 2K1 and 3K5
K1 includes 2K4, 3K7 and 4K2
7K6 includes 1K10, 3K9 and 4K5
7K? includes 1K11, 3K10 and 4K6
If you want to marry, you can select other values ​​from Table 2.
h7K6 (tropical humid heat) and 7K7 (tropical dry heat) are detailed in the attached E. 2 Special climatic conditions level
Environmental parameters
Air pressure
Heat radiation
Surrounding air movement"
Water other than rainwater
Special conditions Z
Obviously
There are heat-assisted radiation conditions, such as heat-insulating devices near the heating system, such as: heating system, commercial furnace or industrial dehumidification near 5
Obviously
Environmental parameters
Water other than southern water
Table 2 (continued)
GB/T 4798.7—2007
Special conditions 2
The cooling effect of the cooling system without auxiliary convection is weakened due to the reverse movement of the surrounding air. .Underwater conditions are not considered,
C7215 level corresponds to an altitude of about 140m.
Biological condition level
Environmental parameters
Environmental parameters
Oxygen dioxide
Hydrogen fluoride
Oxidation (with nitrogen
as a value
Unit"
cm*/ml
Negligible
Negligible
Maximum value
Negligible
Cyclic orchids, lice
Xiaoyin, lice
Rodents and other harmful
animal conditions (excluding white mosquitoes)
Chemically active substances condition level
Maximum value
Negligible
Maximum
Negligible?
Average
Maximum
Rodents and other harmful animals
Operation (including white mosquitoes)
Average
Spot value
Salt
Average
Maximum
4,8
aValues ​​in cm*/m, converted from values ​​in mg/m, reference temperature 20t, air pressure 101.3kPa, the table is the adjusted value. bThe average value is the long-term value, the maximum value is the random value or peak position that does not exceed 30 minutes per day and is not required to be considered. 7C3 and?C4 grade each parameter combined effect. If necessary, a parameter in these two grades can be selected separately. In this case, if not specifically stated, the other parameters are selected according to the 7C2 grade. d Salt spray may occur in sheltered places and offshore places in coastal areas. 7CIR includes 3C1R, 7C1L includes 3C1L. 7C1 includes 3C1 and 4C1, 7C2 includes 3C2 and 1C2, 7C3 includes 3C3 and 4C3, 7C4 includes 3C4 and 1CA.
GB/T 4798.7—2007
Environmental parameters
Dust (floating)
Dust (deposition)
Environmental parameters
Sinusoidal steady-state vibration
Acceleration
Frequency range
Standard random motion
Acceleration spectrum density
Frequency range
Table 5 Mechanically active material condition level
Non-steady-state motion including impact
(see density 1)
Impact response spectrum II Peak value acceleration
Impact response spectrum II Peak value acceleration
By drop
Mass 1kg
Drop depth
Mass test between 1 kg and 1D
Drop separation
Mass between 10 kg and 50 kg Table 6 Mechanical condition level
02~99~200200~500j2~g92002005002-9 9~-200 200 --500
10--200 200~-2 000
10-200 200-2 000
10*200200-2 000
The severity shall be negotiated by both parties
Note: The vibration value and frequency range in the table are related to the structure of the site. Portable and non-fixed products are generally not closely related to them. However, if the design of the test specification uses these data, the performance and use site of the product should be considered. Table 7 Environmental condition level combination
Environmental conditions
Special elements
Chemically active substances
Mechanically active substances
IE: 71
Level combination
(e/u/h
Duration of half-sine pulse
Maximum 1: duration 22m5;
Maximum 1: duration 11 ms;
Number 2: duration 6.
Figure 1 Typical shock response spectrum (first level maximum shock response spectrum) GB/T 4798.7—2007
Rate/112
GB/T 4798.72007
A.1 General
Appendix A
(Informative Appendix)
Explanation of conditions affecting the selection of environmental parameters and severity This appendix explains the basis for each level, gives the description of conditions affecting the selection of environmental parameters and severity, and also includes a summary of the conditions covered by each level.
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 sites are sorted in increasing order of severity. Tables A.1 to A.5 describe the environmental conditions of the use sites. In the level column, "×" represents the level of the use site. The first "×" from left to right is the lowest level for the use site. The above steps for determining the appropriate level apply to all parts, but Table 1 gives the additional four climate types, which should be noted when selecting the level! Read vertically along the climate type column, read horizontally along the place of use, and then read to the right along the first "×" at the intersection of the two. The first "×" encountered in the level column is the lowest level covering the place of use. The climate types specified in IEC060721-8-7 are as follows: extreme cold (excluding the center of Antarctica), cold, cold temperature, warm temperature, hot, moderate heat, extremely dry heat, humid heat, but not humid heat. The climate types of my country and the corresponding relationship with the climate types of IEC are shown in Appendix F. It should be noted that if a level covers the basic use place in this appendix, it 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 Installation A.1 describes the application of climate environment parameters and locations, climate types and climate condition levels. Table A.1 Climate Conditions Climate Environment Parameters Locations Climate protection locations with temperature control, heating or cooling devices with periodic interruption to avoid extreme low temperatures Locations without temperature control. Heating devices can be used when necessary to avoid extreme low temperatures directly affecting the equipment Climate Locations Various building types Locations Ground moving equipment.
Heating cable in machine
High temperature/bar
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