This International Standard applies to the classification of degrees of protection provided by enclosures for rotating electrical machines. It defines the requirements for protective enclosures that are in all other aspects suitable for their intended use and which, from the point of view of materials and workmanship, ensure that the properties dealt with in this standard are maintained under normal conditions of use. This standard does not specify: 1) degrees of protection against mechanical damage of the machine, or conditions such of moisture (produced for example by condensation), corrosive vapours, fungus or vermin; 2) types of protection of machines f