DS EN 50065-4-6:2004 Signaling On Low-Voltage Electrical Installations In The Frequency Range 3 Khz To 148,5 Khz - Part 4-6: Low Voltage Decoupling Filters - Phase Coupler Pertains to phase couplers in a mains communication system for phase to neutral voltage not exceeding 250 V a.c. and a nominal current not exceeding 125 A, intended for household and similar fixed ins