DS EN 50065-1:2011 Signalling On Low-Voltage Electrical Installations In The Frequency Range 3 Khz To 148,5 Khz - Part 1: General Requirements, Frequency Bands And Electromagnetic Disturbances Applicable to electrical equipment using signals in the frequency range 3 kHz to 148,5 kHz to transmit information on low voltage electrical systems, either on the public electricity distribution netw