Noticed this plug on my wall from when I moved into this house, and I just started wondering again about what it's actually for. This is in the UK, if that helps. It's on a big bulky box hanging on the wall below my desk next to two regular plug sockets. Edit: best suggestion I've seen here is that it could be a fuse box for an alarm system. Makes sense since this house did have several security systems before I moved in. Also, for added context, this is in a bedroom and the wire coming out of it goes straight into the wall.
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