IEC 60794-3-21:2015 is a product specification. It presents the detailed requirements specific to optical self-supporting aerial telecommunication cables for use in premises cabling to ensure compatibility with ISO/IEC 11801 and ISO/IEC 24702. The requirements of the family specification IEC 60794-3-20 and sectional specification IEC 60794-3 are applicable to cables covered by this standard. This second edition cancels and replaces the first edition published in 2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- reference to ISO 24702,
- reference to Fibre B6 (IEC 60793-2-50),
- reference to the OS2 Fibre as defined by ISO/IEC 11801. Keywords: optical self-supporting aerial telecommunication cables

This publication is to be read in conjunction with IEC 60794-1-1:2015, IEC 60794-1-2:2013, IEC 60794-3:2014 and IEC 60794-3-20:2009.