DS EN 50065-2-3:2003 Signaling On Low-Voltage Electrical Installations In The Frequency Range 3 Khz To 148,5 Khz - Part 2-3: Immunity Requirements For Mains Communications Equipment And Systems Operating In The Range Of Frequencies 3 Khz To 95 Khz And Intended For Use By Electricity Suppliers And Distributors Pertains to electrical equipment using signals in the frequency range 3 kHz to 95 kHz to transmit or receive information on low voltage electrical systems, for electricity suppliers and distributors.