This standard specifies the use environment conditions and severity levels of outdoor and indoor anti-corrosion electrical products (hereinafter referred to as anti-corrosion products). This standard is applicable to anti-corrosion electrical products. In the production, processing and manufacturing sites of chemical, petroleum, metallurgy, light industry, medicine, textile, building materials, electricity, machinery and other industries, where there are corrosive gases, mist or liquid of acid, alkali and salt, dust and accompanied by humidity or high temperature and other environmental factors, the anti-corrosion electrical products can be provided with corresponding environmental conditions according to the severity levels specified in this standard. JB/T 4375-1999 Environmental conditions for the use of electrical products in outdoor and indoor corrosive places JB/T4375-1999 Standard download decompression password: www.bzxz.net
This standard specifies the use environment conditions and severity levels of outdoor and indoor anti-corrosion electrical products (hereinafter referred to as anti-corrosion products). This standard is applicable to anti-corrosion electrical products. In the production, processing and manufacturing sites of chemical, petroleum, metallurgy, light industry, medicine, textile, building materials, electricity, machinery, etc., where there are corrosive gases, acid, alkali, salt mist or liquid, dust and accompanied by humidity or high temperature and other environmental factors, the anti-corrosion electrical products can be required to meet the environmental conditions corresponding to the severity level specified in this standard.

JB/T4375-1999
Foreword
This standard is a revision of JB4375-86 "Environmental conditions for use of electrical products in outdoor and indoor corrosive places". The technical content of the revised JB/T4375-1999 is consistent with JB4375-86. According to the requirements of GB/T1.1-1993 and GB/T1.3-1997, the foreword and reference standards are added, and the writing format of this standard is adjusted. Appendix A of this standard is a reminder appendix.
This standard replaces JB4375-86 from the date of implementation. This standard is proposed and managed by Guangzhou Electric Science Research Institute. This standard is drafted by Guangzhou Electric Science Research Institute and participated by Nanjing Chemical Industry Company Design Institute. The main drafters of this standard are Wu Xueming, Zhao Shijie and Jiang Peichang. 1 Scope
Standard of the Machinery Industry of the People's Republic of China
Environmental conditions required by electric products used in outdoor and indoor corrosive locations
Environmental conditions required by electric products used in outdoor and indoor corrosive locationsJB/T43751999
Replaces JB4375-86
This standard specifies the environmental conditions and severity levels for the use of outdoor and indoor anti-corrosion electric products (hereinafter referred to as anti-corrosion electric products). This standard is applicable to anti-corrosion electric products. In the production, processing and manufacturing sites of chemical, petroleum, metallurgy, light industry, medicine, textile, building materials, electric power, machinery and other industries, where there are corrosive gases, mist or liquid of acid, alkali and salt, dust and other environmental factors such as humidity or high temperature, environmental conditions suitable for anti-corrosion electric products can be proposed according to the severity levels specified in this standard. Note: "Outdoor" means a place without weather protection, which refers to a place without protection against the weather influence to which the product is subjected. "Indoor" means a place with weather protection, which refers to a place where the product can be completely or partially protected from direct weather influence. The use environment conditions in the content of the industry standards of various anti-corrosion electrical products shall comply with the provisions of this standard. Anything not specified in this standard shall be specified by the industry standards of each product.
2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB/T4796-1984:
Classification of environmental parameters for electrical and electronic products and their severity classification GB/T4797.1-1984 Natural environmental conditions for electrical and electronic products Temperature and humidity GB/T4798.3-1990 Application environmental conditions for electrical and electronic products Fixed use in places with climate protection GB/T4798.4-1990 Application environmental conditions for electrical and electronic products Fixed use in places without climate protection General requirements
3.1 The climate protection types used in this standard shall be in accordance with the provisions of GB/T4797.1. 3.2 When designing anti-corrosion electrical products, it should be noted that the combined effect of two or more environmental parameters will enhance the impact on the product. In particular, the combined effect of high relative humidity and chemically active substances or mechanically active substances is more significant. Attention should also be paid to the impact of other environmental factors (such as heat sources, special production processes, etc.) that appear in certain places. 3.3 If the environmental condition level specified in this standard cannot meet the extreme special environmental conditions, the manufacturer and the user may negotiate and determine the use of other levels specified in GB/T4796.
4 Classification and severity classification of environmental conditions
4.1 Environmental conditions include: climatic conditions (K), special climatic conditions (Z), biological conditions (B), chemical active material conditions (C), JB/T4375-1999
Mechanical active material conditions (S) and mechanical conditions (M), a total of six categories 4.2 Environmental conditions for the use of anti-corrosion electrical products The environmental condition severity level specified is selected from Table 1. The level marked with a higher number usually includes the level marked with a lower number (except for special climatic conditions 2). When using this standard, the environmental condition level with the lowest severity that can meet the product use requirements should be selected. 4.3
Table 1 Severity level of environmental conditions
Conditions
Climate
Special climate
(1) Thermal radiation
(2) Ambient air movement
(3) Water other than rainfall
Biological
Chemically active substances
Mechanically active substances
Mechanical
Climate-protected places
3K5L, 3K6, 3K6L, 3K7
3Zhl, 3Zh3
3Za5, 3Za6
3Zw7, 3Zw9, 3Zw10
3C2, 3C3, 3C4
3S2, 3S3, 3S4
Places
Places without weather protection
4K1, 4K2, 4K3
4Zh1, 4Zh2
4Za3, 4Za4, 4Za5
4Zw6, 4Zw7, 4Zw8
4C2, 4C3, 4C4
4S2, 4S3, 4S4
According to the provisions of basic series products
Note: When the biological conditions are at the C3 and C4 levels of chemically active substances, the conditions of bacteria and fungi are not considered. 4.4 The "3" in the environmental condition levels specified in this standard (such as codes 3KX, 3ZX, 3CX and 4KX, 4ZX, 4CX, etc.) indicates a place with weather protection; "4" indicates a place without weather protection. 4.5 Climate conditions:
4.5.1
The severity levels of climate environmental conditions are shown in Tables 2 and 3. The parameter values \u200b\u200blisted in the table are all multi-year averages of the annual maximum values. Table 2 Climatic environmental conditions in places with climatic protection. Level Environmental parameters
a) Low temperature
b) High temperature
c) Low relative humidity
d) High relative humidity
e) Low absolute humidity
f) High absolute humidity
g) Temperature change rate3)
h) Low air pressure
i) High air pressure
i) Solar radiation
k) Thermal radiation
1) Surrounding air movement 5\u300b
cC/min||tt ||W/m2
3KSL1)
3K6L
700\u30011120
Table 4
+7021
Environmental parameters
n) Precipitation conditions (rain, snow, etc.)
0) Water other than rainfall
P) Freezing conditions
JB/T4375-1999
Table 2 (end)
3K5L1
The letter "L" indicates that some parameters are slightly lower than the original level. Etc.
Table 4
When there is no temperature rise caused by direct sunlight or heat radiation from process equipment, +40\u2103 is used. The temperature change rate is the average value of 5min.
3K6L
Due to technical and economic reasons. Some electrical products can determine their "low pressure" value according to their own technical requirements. 4)
In special cases, it can be selected from Table 4.
Table 3 Climate environment conditions and levels of environmental parameters in places without climate protection
a) Low temperature
b) High temperature
c) Low relative humidity
d) High relative humidity
e) Low absolute humidity
f) High absolute humidity
8) Temperature change rate3)
h) Low pressure
i) High pressure
) Solar radiation
k) Thermal radiation
1) Ambient air movement
m) Condensation conditions
n) Precipitation conditions (rain, snow, bracts, etc.)
o) Rainfall intensity
p) Rainwater temperature (low)5)
9) Water other than rainfall
r) Ice and frost conditions
g/m3
/min
W/m2
m/min
- 20
0.152
252)
Level
0.15
704)
1120
Table 5
Table 5
Table 5
0.04
1) High (low) relative humidity is limited by high (low) absolute humidity. Therefore, for environmental parameters a and c; b and d, the severity levels specified in Table 3 will not appear at the same time.
The absolute humidity value of 4K1 is changed to be consistent with 4K2- to expand the coverage area of \u200b\u200bthis level. 3)
The temperature change rate is based on the average value of 5 minutes.
70kPa represents the limit value for outdoor use, which is usually equivalent to 3000m above sea level. Some areas may also use an altitude slightly higher than 3000m. 4.5.2
See Table 4~Table 5 for special climatic environmental conditions. JB/T4375-1999
Table 4 Special climatic environmental conditions in places with climatic protection Level Environmental parameters
k) Thermal radiation
I) Ambient air movement
o) Water other than rainfall
Level
3Zhl
3Zh3
3Za5
3Za6
3Zw7
3Zw9
3Zw10
Special conditions
Can be ignored
There are thermal radiation conditions, such as 10 near industrial and commercial furnaces
Dripping conditions
Splashing conditions
Spraying conditions
Note: The letters marked with the level codes of special environmental and climatic conditions mean h-thermal radiation; a-air movement; w-water other than rainfall (same as Table 5) Table 5, Levels of special climatic environmental conditions in places without climate protection Environmental parameters
k) Thermal radiation
1) Surrounding air movement
0) Water other than rainfall
Levels of biological environmental conditions are shown in Table 6.
Grade
4Zhl
4Zh2
4Za3
4Za4
4Za5
4Za6
4Zw7
4Zw8
Special conditions
Can be ignored
There are heat radiation conditions. For example, near industrial and commercial furnaces 20
Can be ignored
Splashing water conditions
Spraying water conditions
Table 6 Biological environmental condition levels for places with and without climate protection Environmental parameters
Plants
Animal
3B2, 4B1
Conditions such as mold and fungi
Conditions of rodents and other animals that endanger products, except termites Chemical active substances Environmental condition levels See Table 7. Table 7 Environmental conditions for chemically active substances in places with and without climate protection Level 1) Class bzxz.net
Environmental parameters
a) Salt spray
b) Sulfur dioxide
mg/m34)
cm/m
3C2,
Average value 2)
0.11
Maximum value 2)
0.37
3C3, 4C3
Average value
1.85
Maximum value
Part 3)
3C4,
Average value
Maximum value Maximum value
14.8
c) Hydrogen sulfide
d) Fluorine
Environmental parameters
mg/m3
cm/m3
mg/m3
cm//m3
e) Hydrogen chloride
f) Hydrogen fluoride
8) Ammonia
h) Ozone
i) Nitrogen oxide5)
mg/m3
cm/m3
mg/m3
cm2/m3
mg/m3
cm/m3| | tt | .01
0.012
0.05
0.025
max 2
0.36
0.33
0.03
0 .036
0.05
1.0.
3C3.4C3
Average value
0.66
0.05
0.06
0.05
Maximum value
0.34
0.15
cm/m3
1.56
0.26
0.52
4.68
This level belongs to when the concentration value of one or more chemical gases in the ambient air meets the values \u200b\u200bin this table. 1)
3C4,4
Average value
1.98
0.12
Maximum value
49.7
175.
10.4
The average value is the average of the long-term value. The maximum value is the limit value or peak value during a period not exceeding 30 minutes per day. If it exceeds 30 minutes, the grade should be increased.
Salt spray conditions are only qualitatively specified and not divided into grades. The value of the unit cm/m is converted from the value of mg/m2, and the temperature is 20\u2103. Equivalent to the value of nitrogen dioxide.
The environmental condition levels of mechanically active substances are shown in Tables 8 and 9. Table 8 Environmental parameters for the environmental conditions of mechanically active substances in places with weather protection
a) Sand
b) Dust (floating)
c) Dust (settling)
a). Sand
b) Dust (floating)
mg/m3
mg/m
mg/m2.d
Table 9 Environmental parameters for the environmental conditions of mechanically active substances in places without weather protection
m g/m3
mg/m3
1000
3000
1000
4000
JB/T4375-1999
Appendix A
(Appendix to the standard)
Explanation of the environmental condition levels included in this standard This appendix explains the various environmental conditions in the standard according to different levels to facilitate the correct selection of environmental condition levels. A1 Climate environmental conditions
The climate protection types used in this standard are in accordance with the provisions of GB/T4797.1. The climate types and their codes specified in my country's national standards and IEC standards are shown in Table Al.
Table Al
Table of climate types specified by national standards and IEC
GB/T 4797.1-1984
cold
cold temperature I
cold temperature II
warm temperature
dry heat
subhumid heat
humid heat
EC60721-2-1 publication
extremely cold
cold
cold temperature (cold temperate)
warm temperature (warm temperate)
dry heat (warm bry)
moderately dry heat (mildwarmdry)
extremelywarmdry
warmdamp
warmdampequivalent
The application description of the climate environment condition level is as follows:'IEC600721-2-1
Code
MWDr
EWDr
WdaE
A1.13K5L: The conditions of this level are applicable to certain workshops, factories, unattended machine rooms, etc. The above-mentioned places of use generally have no temperature and humidity control, but when the indoor and outdoor temperature difference is large, heating devices can be used. The products in use will be affected by sunlight radiation, heat radiation and air flow (wind) condensation, etc., as well as water other than rainfall, but will not be affected by natural precipitation and freezing.
3K5L is the same as 3K5 except that the "high temperature" is limited to 40\u2103. A1.23K6, 3K6L, 3K7: These levels of conditions are applicable to places without temperature and humidity control, which can be directly connected to the outdoors, and the buildings are not airtight, including some types of factory buildings with only openings around the roof. Although the environmental conditions in these places are not outdoor conditions, they are more obviously affected by the outdoor climate. The products in use will be affected by sunlight radiation, heat radiation, air flow, condensation, water and freezing other than rainfall, and will also encounter a small amount of natural precipitation such as rain, snow, and mold brought by the wind. A1.34K1: This level is used for products directly exposed to "warm temperature" and "sub-humid heat" climate types without climate protection (the absolute humidity value is the same as 4K2 to expand the coverage area). Climate protection places.
JB/T43751999
A1.54K3: This level is used for products directly exposed to "cold", "cold temperature", "warm temperature", "dry heat", "sub-humid heat", "humid heat" and "humid heat" climate types without climate protection. A2 Biological environmental conditions
3B2, 4B1: These two levels are used in places where products are exposed to mold growth and animal damage, but there are no termites. A3 Chemically active substances environmental conditions
A3.13C2, 4C2: This level is used in places with a general degree of pollution, where chemically active substances are distributed throughout the area or in towns with heavy traffic. The concentration of chemical gases in the environment is low, but sometimes a pungent odor can be smelled. A3.23C3, 4C3: These two levels are used in places where chemical pollutants exist near industrial production areas or directly in industrial production areas. There are medium concentrations of chemical gases in the environment, and people can often feel the stimulation of chemical substances. A3.33C4, 4C4: These two levels are used in places where high concentrations of chemical pollutants may appear in industrial production areas. Chemical gases in the environment have a strong irritating effect on the human body, and sometimes protective equipment must be worn to work on site. A4 Mechanically Active Substances Environmental Conditions
A4.13S2: This level is used in weather-protected places without anti-sand and dust facilities, but the place is not close to the sand or dust source. A4.23S3: This level is used in weather-protected places close to sand, dust or industrial dust sources or in geographical locations where there is windy sand or dust in the air.
A4.33S4: This level is used in weather-protected places where industrial dust is produced during processing or where the geographical location is in windy sand or dust. A4.44S2: This level is used in weather-protected places in areas with sand, dust or industrial dust sources. A4.54S3: This level is used in weather-protected places close to sand, dust or industrial dust sources or in geographical locations where there is windy sand or dust in the air.
A4.64S4: This level is used in weather-protected places where there is often a high content of sand, dust or industrial dust in the air due to geographical or production conditions.
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