DS EN 50065-4-2:2002 Signaling On Low Voltage Electrical Installations In The Frequency Range 3 Khz To 148,5 Khz - Part 4-2: Low Voltage Decoupling Filters - Safety Requirements Pertains 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 exceedin