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IEC 61535:2009+A1:2012 applies to two up to five wire installation couplers including earth, if provided, with a rated voltage up to and including 500 V a.c. and a rated connecting capacity up to and including 10 mmª for permanent connection in indoor electrical installations. Installation couplers with additional contacts for voltages other than mains voltages are outside the scope of this standard. This consolidated version consists of the first edition (2009) and its amendment 1 (2012). Therefore, no need to order amendment in addition to this publication.