1 (1988) "Appendix World distribution daily global irradiation".
Table 8.EXTERNAL INFLUENCES EFFECTING ELECTRICAL EQUIPMENT AND INSTALLATION
78
IEC 721 presents number classes environmental parameters and their severities
covering the conditions most frequently met electrotechnical products and equipment while
being:- transported, stored, installed,used.
4) For these Publications exists corrigendum.1989)
IEC
No.
The classification presented such manner that Standard Committees other users
concerned can select from the classes proposed those which are appropriate for the case of
application. Table 8.
Classification environmental conditions
721-1 Part Classification environmental parameters and their severities
721-2 Part Environmental conditions appearing nature
721-2-1 Temperature and humidity
721-2-2 Precipitation and wind
721-2-3 Air pressure
721-2-4 Solar radiation and temperature
721-2-5 Dust, sand, salt, mist, wind
721-2-6 Earthquake vibrations and shocks
721-2-7 Fauna and flora
721-3 Part Classification groups environmental parameters and their
severities
721-3-0 Introduction
721-3-1 Storage
721-3-2 Transportation
721-3-3 Stationary use weatherprotected locations
721-3-4 Stationary use nonweatherprotected locations
721-3-5 Ground vehicle installations
721-3-6 Ship environment
721-3-7 Portable and nonstationary use
1) IEC 721-2-1 (1982) with one amendment (Appendix and B):
- Amendment No.2 shows list the Parts IEC 721.
3) IEC 721-3-0 with one amendment:
- Amendment No.1 (1987) "Applies the duration and frequency occurrence".7.
2) IEC 721-2-4 (1987) with one amendment:
- Amendment No.
.2 List Parts the IEC Publication 721 "Classification environmental conditions"
(collated 1.1 (1987) "Geographical survey statistical open-air climates" with two coloured maps
"Open-air climates continents and large islands" and "Constitutional
diagram for humid air"
