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We have two different apartments, side by side (same floor), with separate electrical panels. For some reason Powerline can transfer Ethernet between the two apartments (with a bit under 60Mbps bandwidth!). Some times the Powerline adapters may need to resync or just stop working, but that happens very rarely (~2 times a year).

Should I be worried that the two apartments are sharing wiring or that their panels are not separating them properly?

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    \$\begingroup\$ @King: I think we're talking about Ethernet over mains wiring with one device in each apartment. I suspect that powerline is a brand name and should be capitalised. \$\endgroup\$ – Transistor Jun 27 '19 at 21:13
  • \$\begingroup\$ @Transistor yes you are correct (it was capitalized in the title) \$\endgroup\$ – Reinstate Monica Jun 28 '19 at 10:45
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Should I be worried that the two apartments are sharing wiring or that their panels are not separating them properly?

Of course not. You're sharing the same supply with half the street. Everyone on your transformer will share the supply. If it is a three-phase supply then it is likely that 1/3 of the users will be on each phase. It's quite likely that your whole building is on the same supply.

If you were not on the same supply you would not be able to transmit data between apartments using the mains wiring.

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