This part of IEC 60332 covers category D for methods of test for the assessment ofvertical flame spread of vertically mounted bunched wires or cables, electrical or optical,under defined conditions.This document relates only to small cables of overall diameter 12 mm or smaller and crosssectionof 35 mm2 or smaller installed on the test ladder to achieve a nominal total volume ofnon-metallic material of 0,5 l/m of test sample. The flame application time is 20 min. Themethod of mounting uses the front of the standard ladder in touching formation only. Thecategory is intended for use with small cables where very low volumes of non-metallicmaterial are required to be evaluated.The test is intended for type approval testing. The requirements for the selection of cables fortesting are given in Annex A. The flame spread is measured as the extent of damage of thecable sample. This procedure can be used to demonstrate the cable’s ability to limitflame spread.A recommended performance requirement is given in Annex B.NOTE For the purposes of this document the term "electric wire or cable" covers all insulated metallic conductorcables used for the conveyance of energy or signals.

IEC 60332-3-25 : 1.1