GB/T 4797.5-2017 English PDF

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GB/T 4797.5-2017: Classification of environmental conditions -- Environmental conditions appearing in nature -- Precipitation and wind
Status: Valid

GB/T 4797.5: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4797.5-2017	184	Add to Cart	3 days	Classification of environmental conditions -- Environmental conditions appearing in nature -- Precipitation and wind	Valid
GB/T 4797.5-2008	559	Add to Cart	3 days	Classification of environmental conditions -- Environmental conditions of nature -- Precipitation and wind	Obsolete
GB/T 4797.5-1992	439	Add to Cart	4 days	Environmental condiions appearing in naure of electric and elecronic products--Precipitation and wind	Obsolete

Similar standards

GB/T 14092.1   GB/T 14092.2   GB/T 4798.2   GB/T 4797.3   GB/T 4797.9   GB/T 4797.4   

Basic data

Standard ID: GB/T 4797.5-2017 (GB/T4797.5-2017)
Description (Translated English): Classification of environmental conditions -- Environmental conditions appearing in nature -- Precipitation and wind
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A21
Classification of International Standard: 19.020
Word Count Estimation: 10,123
Date of Issue: 2017-12-29
Date of Implementation: 2018-07-01
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 4797.5-2017: Classification of environmental conditions -- Environmental conditions appearing in nature -- Precipitation and wind

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Classification of environmental conditions - Environmental conditions appearing in nature - Precipitation and wind ICS 19.020 A21 National Standards of People's Republic of China Replacing GB/T 4797.5-2008 Environmental conditions classification Natural environment Precipitation and wind Classification of environmentalconditions-Environmentalconditions (IEC 60721-2-2..2012, Classification of environmental conditions - Part 2-2. Environmentalconditionsappearinginnature-Precipitationandwind, IDT) 2017-12-29 Posted 2018-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Overview 1 4.1 General Description 1 4.2 Precipitation 4.3 wind 1 5 characteristic parameter 2 5.1 rainfall 2 5.2 hail 2 5.3 snow 3 5.4 wind 3 6 Categories 3 6.1 Overview 3 6.2 normal rainfall 4 6.3 wind and rain 4 6.4 Freeze 4 6.4.1 Overview 4 6.4.2 Cream 4 6.4.3 Fog 4 6.4.4 Pure ice 4 6.4.5 Rain 凇 4 6.4.6 Freezing process 4 6.5 hail 5 6.6 Snow load 5 6.7 blowing snow 5 6.8 Wind power 5 Reference 6 Table 1 Rain characteristics (long-term average) 2 Table 2 hail characteristics 3

Foreword

GB/T 4797 includes the following eight sections. --- GB/T 4797.1 Environmental conditions Classification of natural conditions Temperature and humidity; --- GB/T 4797.2 Environmental conditions Classification Natural conditions Air pressure; --- GB/T 4797.3 Electrotechnical products natural environment conditions of biological; --- GB/T 4797.4 Classification of environmental conditions Natural environmental conditions Solar radiation and temperature; --- GB/T 4797.5 Environmental conditions Classification Natural environmental conditions Precipitation and wind; --- GB/T 4797.6 Classification of environmental conditions Natural environmental conditions Dust, sand, salt spray; --- GB/T 4797.7 Classification of environmental conditions for electrical and electronic products Natural environmental conditions Seismic vibration and shock; --- GB/T 4797.8 Electrotechnical products Environmental conditions Classification Natural environmental conditions Fire exposure. This section GB/T 4797 Part 5. This section drafted in accordance with GB/T 1.1-2009 given rules. This Part replaces GB/T 4797.5-2008 "Environmental conditions for electrical and electronic products classification of natural environmental conditions precipitation and the wind." This section compared with GB/T 4797.5-2008 main changes are as follows. --- Standard name changed to "environmental conditions classification of natural conditions precipitation and wind"; --- The original standard Chapter 3, Chapter 5, 5.4 suspended paragraphs were added to the title; --- Modify the simplified "precipitation" and "wind" description (see 4.2 and 4.3); --- Modify formula (1) ~ formula (4); --- Modify Table 1, add the comments in Table 2, delete Table 3, Table 4, Figure 1 ~ Figure 5; --- Delete Appendix NA. This section uses the translation method is equivalent to using IEC 60721-2-2..2012 "Environmental Conditions Classification Part 2-2. natural environmental conditions down Water breeze. " The documents of our country that are in conformity with the corresponding international documents that are normative references in this part are as follows. --- GB/T 4796.1-2017 Environmental classification - Part 1. Environmental parameters and their severity (IEC 60721-1..2002, IDT) This section made the following editorial changes. --- In order to unify with our existing standard series, the title of this section to "environmental conditions classification of natural environmental conditions and precipitation wind"; --- 6.6 Added note. This part of the National Electrical and Electronic Environmental and Environmental Test Standardization Technical Committee (SAC/TC8) and focal point. This section Drafted by. China Electric Apparatus Research Institute Co., Ltd., CNOOC Tianjin Chemical Research and Design Institute Co., Ltd., Fujian Province Can offshore wind R & D Center Co., Ltd. The main drafters of this section. Liu Xin, Huang Kaiyun, Guo Zhijia, Li Ying. This part of the standard replaces the previous editions are. --- GB/T 4797.5-1992, GB/T 4797.5-2008. Environmental conditions classification Natural environment Precipitation and wind

1 Scope

This section GB/T 4797 specifies the basic characteristics of precipitation and wind environmental conditions related to electrical and electronic products, quantitative description and classification. The purpose of this section is to provide background information on the severity of the product application in selecting the appropriate precipitation and wind related parameters. When selecting the appropriate severity of precipitation and wind-related parameters for product applications, the values specified in IEC 60721-1 are preferred.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. IEC 60721-1 Classification of environmental conditions - Part 1. Environmental parameters and classification (Classificationofenvironmentalcon- ditions-Part 1. Enviromental parameters and theirseverities)

3 Terms and definitions

no.

4 Overview

4.1 General instructions The earth's atmosphere is constantly moving, and local heat, cold and wet. As a result, a gradient in density occurs, creating a high pressure zone And low pressure area. Due to the Coriolis force of the Earth's rotation, the wind does not directly blow from the high pressure zone to the low pressure zone. The continuous horizontal movement of air, causing a slow rise in the vast region of movement, or surface heat, causing local hot air rose. Ascending movement of air causes the pressure and temperature to drop, and when both fall sufficiently low, precipitation can form. For example, at 20 ℃, the air most Large water vapor content of 17.3g/m3, if dropped to 0 ℃, the maximum water vapor content in the air is only 4.8g/m3. 4.2 Precipitation Specific types of precipitation rain, hail or snow, are the result of complex changes in clouds. The formation of raindrops or ice crystals depends on various conditions such as vertical air flow, temperature distribution, and the synthesis of water droplets or ice crystals in the clouds process. 4.3 wind Wind refers to the earth's atmosphere from the high-pressure zone to the low-pressure zone lateral movement. The wind is often expressed in terms of strength and direction of the wind. Gusts are high-speed winds of short duration. Winds last for a long time according to their flat Both have different names, for example, breeze, gale, storm, hurricane, typhoon. The scale of the formation of wind is also very different. for tens of minutes ......

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