Connection through the mains power only in certain 1 Fam. Houses possible.

The unit I use along with the wounded as a base station on the LAN Powerline 520E.
Sockets and lighting have with us each room its own circuits. There are several fault current switch (300, 30 and 10 mA) used. Does the signal via 2 fault current switch in two adjacent rooms are transferred, no connection is possible. The device is therefore to be used only in houses with extremely simple wiring.
Of course, this is concealed in the documentation and on the packaging.
In the same circuit, the 540E works, however good (hence 2 stars, otherwise 0).
However, like all my other devices Fritz quite warm, so surely burned a lot of energy.