IEC 60598-2-20:2010 specifies requirements for lighting chains fitted with series- or parallel- or a combination of series/parallel-connected incandescent lamps for use either indoors or outdoors on supply voltages not exceeding 250 V. This third edition cancels and replaces the second edition published in 1996, its Amendment 1 (1998), its Amendment 2 (2002) and the interpretation sheets of March 2001 (1) and July 2003 (2 and 3). This third edition is based on the second edition, its Amendments 1 and 2 and the interpretation sheets of March 2001 (1) and July 2003 (2 and 3) and incorporates some changes relating to 20.7.15. This third edition constitutes a minor revision. This publication is intended to be read in conjunction with IEC 60598-1: Luminaires - Part 1: General requirements and tests. It was established on the basis of the seventh edition (2008) of that standard.