GOST EN 50065-1-2013 Electromagnetic compatibility of technical equipment. 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
2013GOST EN 50065-1-2013 Electromagnetic compatibility of technical equipment. 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