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I've bought four powerline adapters (2 packs of TP-Link TL-PA411Kit AV500 500MBPS Nano Powerline Adapter starter Twin Pack). They all work nicely on the groundfloor ring main in my house. But they refuse to connect to other ring mains (the kitchen, upper floor) in my house.

I have a fusebox which has RCD fuses on each ring main (UK standard, 240v), and I guess this might be causing the problem.

Can you confirm whether the adapters are able to connect across the RCDs?
Is there a work around to get adapters to talk across RCDs?

Thanks

Simon