IEC 61314-1:2011 specifies requirements for fan-outs used in the fibre optics field to provide a safe transition from multifibre cable units to individual fibres or cables. This standard does not cover test and measurement procedures, which are described in IEC 61300 series. This fourth edition cancels and replaces the third edition published in 2009 and constitutes a technical revision. The specific technical changes from the previous edition are to reconsider a drawing showing the relationship between IEC 60874, IEC 61753, IEC 61754 series of standards, and updating the normative references.