This standard applies to new voltage transformers for use with measuring instruments and protective devices with frequencies between 15 Hz and 100 Hz. The general requirements of this chapter apply to all voltage transformers, but for certain types eg voltage transformers capacitive voltage, the requirements are subject to the modifications established in the corresponding chapter. Although the requirements refer basically to transformers with separate windings, they are also applicable to autotransformers. The standard does not apply to transformers for use in laboratories. Note.- Specific requirements for three-phase voltage transformers are not included in this standard, but the requirements of Chapter I apply to the extent appropriate; Some references are made (eg Subclause 4.4 and 5.1 clause 6 and section 7).