This section of IEC 598-2 specifies requirements for luminaire with bulit-in transformers for filament lamps, with supply voltages and output voltages not exceeding: -- 1000 V for class I and class II luminaires and -- 250 V for class 0 luminaires. It is to be read in conjunction with those sections of IEC 598-1 to which reference is made. This section does not apply to class III luminaires. It is not necessary to use "Safety extra low voltage" (SELV) transformers to comply with the requirements of this section. However, such transformers may satisfy the functional requirements of this section.