Services of housing maintenance, public utilities and administration of apartment buildings. Services content in-house heating systems, heating and hot water supply of apartment houses. General requirements
Signalling 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 intended for use by electricity suppliers and distributors
