1 CNS/GSS/2008/M6 1 Module 6 Degree of Protection

2 CNS/GSS/2008/M6 2 Degree of Protection The IEC standard (02/ 2001) gives, by the IP code, the different degrees of protection provided by an electrical enclosure.

3 CNS/GSS/2008/M6 3 The IP degrees of protection : (IEC 60529/EN 60529) 1st digit: protection of persons protection against solids. 2nd digit : protection against liquids. Additional letter (optional) : protection of persons against contact with live parts A : protect againts access of the back of the hand B : protect against access of fingers Ø 12 mm C : protect against access of a tool diameter 2.5 mm D : protect against access of a tool diameter 0.1 mm Definitions Contents

4 CNS/GSS/2008/M6 4 Degree of protection The IP code is described by 2 specific digits; an additional letter, in option, can complete the IP code when the real protection of persons against contact with live parts is better than the protection given by the first digit: the 1st digit gives the level of protection of equipment against penetration of solid objects and protection of persons the 2nd digit gives the level of protection of equipment against penetration of liquids. Additional letter : it is used only when the effective protection of persons is better than the one given bythe first IP digit in case of only protection of persons is needed, the 2 IP digits are replaced by x. Example : IPxxB. Back

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9 CNS/GSS/2008/M6 9 Degree of Protection IK Code definition Standard IEC defines an IK code that characterises the aptitude of equipment to resist mechanical impacts on all sides

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1 CNS/GSS/2008/M6 11 Degree of Protection External influences (IEC ) External influences shall be taken into account when choosing: --The appropriate measures to ensure the safety of persons (in particular in special locations or electrical installations) --The characteristics of electrical equipment, such as degree of protection (IP), mechanical withstand (IK), etc. Classification Each condition of external influence is designated by a code comprising a group of two capital letters and a number as follows: First letter (A, B or C) The first letter relates to the general category of external influence : c A = environment c B = utilisation c C = construction of buildings

1212 CNS/GSS/2008/M6 12 Degree of Protection Second letter The second letter relates to the nature of the external influence. Number The number relates to the class within each external influence. Example For example the code AC2 signifies: A = environment AC = environment-altitude AC2 = environment-altitude > 2,000 m

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