Thanks all mind duly put at rest, and I shall be sure to teach myself continuity testing.
And I've learned about MK grid switches too, so that's a bonus.
You now know more than most electricians working for the big expensive firms
Thanks all mind duly put at rest, and I shall be sure to teach myself continuity testing.
And I've learned about MK grid switches too, so that's a bonus.
What it used to do is obviously impossible to say.
To find out you will need to determine where the two reds in the wire nut and and the cut black go.
There is also a black wire just cut short, visible (just) between the two red wires at the green wire, further back where it comes in from the wall.
Are you really concerned about that in relation to the backbox of a light switch?The thing I looked at was two holes in a ferrous back box, should be a saw cut between the two holes to stop transformer effect, likely so little current it will not matter specially if LED lights, but I would want to join the two knock outs with a saw cut.
Having had another look, there is also a second unaccompanied red wire so there might be a second cut black.
The thing I looked at was two holes in a ferrous back box, should be a saw cut between the two holes to stop transformer effect, likely so little current it will not matter specially if LED lights, but I would want to join the two knock outs with a saw cut.
I don't quite understand this, do you mean the two holes should be joined by sawing a gap between them? What is the transformer effect and why would cutting a gap help?
Almost looks like a shadow of the red wire. Has the black wire been used as the earth? Perhaps this is why the middle switch is no longer usable?
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