This product safety standard applies to electrical equipment, such as decoupling filters and phase couplers in a mains communication system for a phase to neutral voltage not exceeding AC 250 V and a nominal current not exceeding 125 A, intended for household and similar fixed-electrical installations including residential, commercial and light industrial buildings.The scope was extended to cover the frequency ranges from 3 kHz to 148, 5 kHz and from 1, 6 MHz to 30 MHz.