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Recently, the Curiosity rover experienced an internal short in its RTG - which, according to a bunch of sources, was mitigated due to the rover having a 'floating bus' between its wiring and its chassis. When answering this Space.SE question, I ran accross a problem: I have no idea what a floating bus is.

What is it?

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It's one that doesn't share grounds between the two systems it is connecting. It does so by using either optical or magnetic links instead of voltage levels to transfer data.

schematic

simulate this circuit – Schematic created using CircuitLab

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