Those other mains feed/supplies may need measuring, using a meter, individually --- if one can get a clamp meter over the individual cables with covers off safely... The alternative is even more risky for the unwary /non-competent.
Thanks @Rodders53 for all of those points. In particular, I think it could be worth trying to figure out if something connected to it is drawing the power. If I do manage to get to the bottom of it, I will report back here.
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