Chapter A General rules of electrical installation design

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E24 © Schneider Electric - all rights reserved E - Distribution in low-voltage installations 2 The installation system Fig. E44 : A busway for medium power distribution : Canalis KS (100 up to 1000 A) Fig. E45 : A busway for high power distribution : Canalis KT (800 up to 1000 A) Schneider Electric - Electrical installation guide 2008
E - Distribution in low-voltage installations External influences shall be taken into account when choosing: b The appropriate measures to ensure the safety of persons (in particular in special locations or electrical installations) b The characteristics of electrical equipment, such as degree of protection (IP), mechanical withstand (IK), etc. If several external influences appear at the same time, they can have independent or mutual effects and the degree of protection must be chosen accordingly 3 External influences (IEC 60364-5-51) 3.1 Definition and reference standards Every electrical installation occupies an environment that presents a variable degree of risk: b For people b For the equipment constituting the installation Consequently, environmental conditions influence the definition and choice of appropriate installation equipment and the choice of protective measures for the safety of persons. The environmental conditions are referred to collectively as “external influences”. Many national standards concerned with external influences include a classification scheme which is based on, or which closely resembles, that of international standard IEC 60364-5-51. 3.2 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 : b A = environment b B = utilisation b C = construction of buildings Second letter The second letter relates to the nature of the external influence. Number The number relates to the class within each external influence. Additional letter (optional) Used only if the effective protection of persons is greater than that indicated by the first IP digit. When only the protection of persons is to be specified, the two digits of the IP code are replaced by the X’s. Example: IP XXB. Example For example the code AC2 signifies: A = environment AC = environment-altitude AC2 = environment-altitude > 2,000 m 3.3 List of external influences Figure E46 below is from IEC 60364-5-51, which should be referred to if further details are required. Code External influences Characteristics required for equipment A - Environment AA Ambient temperature (°C) Low High Specially designed equipment or appropriate arrangements AA1 - 60 °C + 5 °C AA2 - 40 °C + 5 °C AA3 - 25 °C + 5 °C AA4 - 5° C + 40 °C Normal (special precautions in certain cases) AA5 + 5 °C + 40 °C Normal AA6 + 5 °C + 60 °C Specially designed equipment or appropriate arrangements AA7 - 25 °C + 55 °C AA8 - 50 °C + 40 °C Fig. E46 : List of external influences (taken from Appendix A of IEC 60364-5-51) (continued on next page) Schneider Electric - Electrical installation guide 2008 E25 © Schneider Electric - all rights reserved
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Chapter A General rules of electrical installation design

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