Re :Networking via your electrical wiring
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Does power line networking work across different phases? Usually a household has 2 phase service to allow for 240 V service for electric clothes driers, ovens and water heaters. Does power line networking work if the power line adapters are on different phases?
Most home electrical distribution boxes alternate phases from one to the next circuit breaker or compact circuit breaker pair. If the power line adapters are on different phases, there isn’t a common connection except through the utility transformer, which I doubt is designed to support the transfer of network high frequencies from one phase to another. In my older home where service was upgraded with new electrical panels there are rooms with only one or two outlets on the same circuit.
How does this work when plugged into different phases? A quick internet search found several users where the cross phase communication did not work unless something was done to connect the two phases, such as an Ethernet “bridge” between the two.