Applicable to cables with a maximum of 64 conductors. Specifies requirements and dimensions for flexible, flat, unscreened, PVC insulated cables with either solid or stranded conductors. The cables are suitable for operation in equipment at voltages up to and including 300 V r.s.m. to earth or between cores and they are regarded as suitable for continuous operation at conductor temperatures from -10 degrees centigrade to 90 degrees centigrade. Colour code for insulation, folding test, tear propagation of the locating groove, flexing test, thermal shock, loss of mass of insulation, dimensional stability after storage, insulation resistance, and dielectric strength are dealt with in the annex.