IEC 529:1989 DEGREES OF PROTECTION PROVIDED BY ENCLOSURES (Code)
INTRODUCTION
This standard describes a system for classifying the degrees of protection provided by theenclosures of electrical equipment. Whilst this system is suitable for use with most types ofelectrical equipment，it should not be assumed that all the listed degrees of protection areapplicable to a particular type of equipment. The manufacturer of the equipment should beconsulted to determine the degrees of protection available and the parts of equipment towhich the stated degree of protection applies.
The adoption of this classification system，wherever possible，will promote uniformity inmethods of describing the protection provided by the enclosure and in the tests to prove thevarious degrees of protection. It should also reduce the number of types of test devicesnecessary to test a wide range of products.
This second edition of IEC 529 takes account of experiences with the first edition,andclarifies the requirements. It provides for an optional extension of the IP Code by anadditional letter A, B,C, or D if the actual protection of persons against access to hazardousparts is higher than that indicated by the first characteristic numeral.
In general,enclosures with an IP coding to the first edition would be eligible for the samecode according to this edition.
1.Scope
This standard applies to the classification of degrees of protection provided byenclosures for electrical equipment with a rated voltage not exceeding 72,5 kv.
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