www.se.com54Simplified design guideDetermining the degree of protectionCABDEFStandard IEC 60364-5-51 categorises a large number of external influences to which electrical installations can be subjected, for instance the presence of water, solid objects, shocks, vibrations and corrosive substances.The importance of these influences depends on the installation conditions.For example, the presence of water can vary from a few drops to total immersion.Standard IEC 60529 (February 2001) indicates 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 gases, fungi or vermin.The IP code comprises 2 characteristic numerals and may include an additional letter when the actual protection of persons against direct contact with live parts is better than that indicated by the first numeral.The first numeral characterises the protection of the equipment against penetration of solid objects and the protection of people.The second numeral characterises the protection of the equipment againstpenetration of water with harmful effects.Remarks concerning the degree of protection IP• The degree of protection IP must always be read and understood numeral by numeral and not as a whole. For example, an IP31 enclosure is suitable for an environment that requires a minimum degree of protection IP21. However an IP30 wall-mount enclosure is not suitable.• The degrees of protection indicated in this catalogue are valid for the enclosures as presented. However, the indicated degree of protection is guaranteed only when the installation and device mounting are carried out in accordance with professional standard practice.Additional letterProtection of persons against direct contact with live parts.The additional letter is used only if the actual protection of persons is higher than that indicated by the first characteristic numeral of the IP code.If only the protection of persons is of interest, the two characteristic numerals arereplaced by the letter "X", e.g. IPXXB.Degree of protection IPDegree of protection IKStandard IEC 62262 defines a coding system (IK code) indicating the degree of protection provided by electrical equipment enclosures against external mechanical impact.Installation standard IEC 60364 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.IK•• codeThe IK code comprises 2 characteristic numerals (e.g. IK05).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.DEBU020EN
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