Generally indoor equipment that is rarely moved and permanently wired in is considered pretty low down on the risk scale. Even under current BS7671 such equipment doesn't need a RCD per-se (though the cable feeding it will often be installed in a way that does require RCD protection).
Showers are thought of as presenting a higher risk that most appliances beause their users are typically wet and naked. Still the RCD is the third line of defense against electric shock.
Already asked and answered, seems for solar panels.
Oh I didn't read all the posts, obviously
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