DIN EN 50065-7:2002 Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz - Part 7: Equipment impedance; German version EN 50065-7:2001
2002DIN EN 50065-7:2002 Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz - Part 7: Equipment impedance; German version EN 50065-7:2001