IEC 60721-3-1:1997 pdf download.Classification of environmental conditions – Part 3: Classification of groups of environmental parameters and their severities – Section 1: Storage
1 Scope and object
This section of IEC 60721 -3 classifies the groups of environmental parameters and their severities to which products, together with their packaging if any, are subjected when stored. The environmental conditions specified in this standard are limited to those which may directly affect the products or their ultimate performance. Only environmental conditions as such are considered. No special description of the effects of these conditions on the products is given. Transfer during storage is not included in the classification. Environmental conditions directly related to fire or explosion and conditions related to ionizing radiation are excluded. Any other unforeseen incidents are also excluded. The possibility of their occurrence should be taken into account in special cases. Offshore locations are not included. Conditions of stationary use, portable and non-stationary use, use in vehicles and ships, and conditions of transportation are given in other sections of IEC 60721 -3. The object of this standard is to classify environmental parameters and their severities to which a product may be exposed during storage. A limited number of classes of environmental conditions is given, covering a broad field of application. The user of this standard should select the lowest classification necessary for covering the conditions of intended storage.
2 Normative references
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this section of IEC 60721 -3. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to agreements based on this section of IEC 60721 -3 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 721 -1 : 1 990, Classification of environmental conditions Part 1 : Environmental
parameters and their severities Amendment 1 (1 992)
IEC 721 -2-1 : 1 982, Classification of environmental conditions Part 2: Environmental
conditions appearing in nature Temperature and humidity Amendment 1 (1 987)
IEC 721 -3-0: 1 984, Classification of environmental conditions Part 3: Classification of groups
of environmental parameters and their severities Introduction Amendment 1 (1 987)
IEC 60721 -3-2: 1 997, Classification of environmental conditions Part 3: Classification of
environmental parameters and their severities Section 2: Transportation
IEC 721 -3-3: 1 994, Classification of environmental conditions Part 3: Classification of
environmental parameters and their severities Section 3: Stationary use at weatherprotected
locations
IEC 721 -3-4: 1 995, Classification of environmental conditions Part 3: Classification of
environmental parameters and their severities Section 4: Stationary use at non-
weatherprotected locations
3 Definitions
For the purposes of this section of IEC 721 -3, the following definitions apply, in addition to the
definitions in clause 3 of IEC 721 -1 :
3.1 storage: The product is placed at a certain site for long periods, but not intended for use
during these periods.
4 General
For further general guidance, see IEC 721 -3-0. The severities specified are those which will have a low probability of being exceeded. All specified values are maximum or limit values. These values may be reached, but do not occur permanently. Depending on the local situation, there may be different frequencies of occurrence related to a certain period of time. Such frequencies of occurrence have not been included in this standard, but should be considered for any environmental parameter. They should additionally be specified, if applicable. Information on the duration and frequency of occurrence is given, as clause 6, in amendment 1 to IEC 721 -3-0. Attention is drawn to the fact that combinations of the environmental parameters given may increase the effect on a product. This applies especially to the presence of high relative humidity in addition to biological conditions, or to the presence of chemically or mechanically active substances.
IEC 60721-3-1:1997 pdf download
