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Do you know what the wire is for?
We had a new unit fitted some time ago and there were 'Spurs' left from the old unit. The new unit had more capacity of these 'spurs' are redundant now as they are in the new unit. Hope that makes sense.
TGR-
Do you know what the wire is for?
According to the electrician who installed a consumer unit, it was a 'spare wire' which used to be wired into the sockets spur- but after he left the wire unplugged, the socket in the hallway stopped working. He didn't say explicitly that they were linked, which I guess is the risk, but I'm sure it is.
ReekBlefs
Thank you, super useful. I think I'm asking if this is one of those 'you can do it if you're careful' things or if it's a 'no get someone in' type situation. It is >1m from the unit, but I've no idea how the cable gets from the socket to the consumer unit - it's hidden from view - but the cable in the understairs bit definitely relates to the socket, because it used to work then didn't once it was disconnected. I'd 'just' be reconnecting it.
The electrician I hired didn't connect the socket because he said he didn't know what it was for - I didn't have anything plugged into it at the time so I didn't notice.