Classification of environmental conditions - Part 2-2: Environmental conditions appearing in nature - Precipitation and wind

IEC 60721-2-2:2012 presents fundamental properties, quantities for characterization, and a classification of environmental conditions dependent on precipitation and wind relevant for electrotechnical products. This second edition cancels and replaces the first edition, published in 1988, and constitutes a technical revision.
The main changes with regard to the previous edition are as follows:

- subclause Precipitation: simplified;

- data not possible to validate are removed;

- subclause Wind: text rewritten;

- Table 1 simplified and aligned with definition used by [1];

- subclause Hail: data added;

- formula changed;

- formula for impact energy added;

- subclause Snow: text changed and aligned with definitions used by [1];

- Table 3 removed;

- subclause Normal rain: text has been modified and numeric values removed;

- subclause Driving rain: text has been modified and numeric values removed;

- subclause Formation of ice: text has been modified and numeric values removed;

- subclause Drifting snow: text added;

- subclause Wind force: formula changed;

- Figure 1 to 5 removed.