I think the
original BOFH "joke" was "Let's see if that 10KV
isolation really works!"
10KV of galvanic isolation won't necessarily
help you much keeping
120VAC or 240VAC across an Ethernet transformer from resulting in
damage to the circuitry on the other side of the transformer.
No...but the transformer is not going to pass very much power at mains
frequency; it's designed for much higher frequencies.
Also, "let's test that isolation" calls for different wiring than
"let's apply mains power across the output of the transformer".
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