This part of IEC60332 specifies a test procedure for assessment of falling flaming droplets/ particles when a single vertical electrical insulated conductor or cable, or optical fibre cable, is subjected to defined fire conditions. NOTE1 Testing to IEC60332‑1‑3 may be performed simultaneously with that to IEC60332‑1‑2 , if required. Recommended requirements for performance are given in AnnexA. IEC60332‑1‑3 specifies the use of a 1kW pre-mixed flame and is for general use, except that the procedure specified may not be suitable for the testing of small single insulated conductors or cables of less than 0,5mm 2 total cross-section because the conductor melts before the test is completed, or for the testing of small optical fibre cables because the cable is broken before the test is completed.