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What's meaning Degrees of protection provided by enclosures IP CODE?

The European standard EN 60529 dated October 1991, IEC publication 529
(2nd edition - November 1989), defines a coding system (IP code) for indicating the
degree of protection provided by electrical equipment enclosures against accidental
direct contact with live parts and against the ingress of solid foreign objects or water.
This standard does not apply to protection against the risk of explosion or conditions
such as humidity, corrosive gasses, fungi or vermin.
Certain equipment is designed to be mounted on an enclosure which will contribute
towards achieving the required degree of protection (example : control devices
mounted on an enclosure).
Different parts of an equipment can have different degrees of protection (example :
enclosure with an opening in the base).
Standard NF C 15-100 (May 1991 edition), section 512, table 51 A, provides a
cross-reference between the various degrees of protection and the environmental
conditions classification, relating to the selection of equipment according to external
factors.
Practical guide UTE C 15-103 shows, in the form of tables, the characteristics
required for electrical equipment (including minimum degrees of protection),
according to the locations in which they are installed
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