GB/T 4797.2-2017Classification of environmental conditions -- Environmental conditions appearing in nature -- Air pressure (English PDF)

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 2.

This section drafted in accordance with GB/T 1.1-2009 given rules.

This Part replaces GB/T 4797.2-2005 "Electrical and Electronic Products Part 2. Natural conditions - Elevation and pressure, water depth and pressure."

This section compared with GB/T 4797.2-2005 main changes are as follows.

--- The name of this section changed to "environmental conditions classification of natural conditions atmospheric pressure";

--- The original standard Chapter 3, Chapter 5, 5.4 suspended paragraphs were added to the title;

--- Modify the simplified headings and descriptions of "sub-standard atmospheres" and "greater than standard atmospheres" (see 4.2 and 4.3);

--- Modify formula (1) ~ formula (4);

--- Modify the height range of 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 60721-2-3..2013 "Environmental Conditions Classification Part 2-3. Natural environmental conditions

Barometric pressure. "

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 4796-2017 environmental classification - Part 1. Environmental parameters and their severity (IEC 60721-1..2002,

IDT)

This section and IEC 60721-2-3..2013 compared to the main editorial changes made the following.

--- In order to unify with our existing standard series, the title of this section to "environmental conditions classification of natural conditions atmospheric pressure."

This part of the National Electrical and Electronic Environmental and Environmental Test Standardization Technical Committee (SAC/TC8) and focal point.

This section Drafted by. Kunming Electric Institute of Science and Technology, China Electric Apparatus Research Institute Co., Ltd., Kunming, limited detection of high-altitude electrical appliances

the company.

1 Scope

This part of GB/T 4797 gives the atmospheric pressure of different altitudes exist in the natural environment, as the product storage, transportation and use

Select the appropriate level of atmospheric pressure background material.

The values in this section can be used when selecting the severity of barometric parameters for product applications.

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 pressure effects