IEC 60811-509:2012 gives the procedure for the test for resistance of insulations and sheaths to cracking at an elevated temperature. IEC 60811-509:2012 cancels and replaces Clause 9 of IEC 60811-3-1:1985, which is withdrawn. Full details of the replacements are shown in Annex A of IEC 60811-100:2012. There are no specific technical changes with respect to the previous edition, but see the Foreword to IEC 60811-100:2012.This publication is to be read in conjunction with a href='http://webstore.iec.ch/webstore/webstore.nsf/ArtNum_PK/46164'IEC 60811-100:2012/a.