Connects all 3 in-house network phases capacitively with each other, so that transmission rates of 650 Mbit are possible via the power network for Internet or computer networking, depending on the nature of the power network. If the signal is only fed into 1 phase, the phase coupler connects all 3 phases with each other so that they become permeable for the power line signal and the Internet or computer signal is also available at all other sockets of the house network. Also for wireless intercom systems. A significant increase in range and transmission quality can be achieved.