Specifies requirements for extra low voltage systems for filament lamps intended for ordinary use on supply voltages not exceeding 1 000 V. The luminaires, being connected in parallel, are supplied via freely suspended continuous supporting conductors or profiles. The current in the output circuit of the system is limited to 25 A. This consolidated version consists of the first edition (1996) and its amendment 1 (2000). Therefore, no need to order amendment in addition to this publication.