Lays down requirements for flexible or semi-flexible radio-frequency cables of coaxial or twin conductor types designed for use in radiocommunication equipment and in electronic devices employing similar techniques. The dielectric may be of the solid, air-spaced, or semi-airspaced types, consisting of a thermoplastic of low-loss polymeric resin or of a thermosetting compound, or of a mineral material.

For standard characteristic impedances and dimensions, see IEC 78.