2 way switch, 2 circuits, arced neutral

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Hi all,
I have just moved into a house and went to use the light switch last night, it buzzed then shorted. Took the switch off this morning and there looks to have been an arc across to neutral(?)

This switch has 2 feeds, looking at it the right switch controls the downstairs hall, the left switch is a 2 way to control the landing.
There are a few cables, it was a blue with red band that seems to have arced, this was connected to the top L3 point, my question is, is the wiring ok? I mean the hallway switch worked fine as I've used that before now, secondly, where is the blue wire meant to go so the 2 way works properly.

Hopefully the photos will help.
Thanks

20200615_103012~2.jpg 20200615_103416.jpg 20200615_103050.jpg 20200615_104225.jpg
 
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It goes in one of the L3s. But as we don’t know which terminals belong to which switch from your diagram I can’t say which L3.
 
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15922173046568197949064943968162.jpg 15922173046568197949064943968162.jpg 15922171696169199937942111464718.jpg Thanks for the reply.
New photo attached.

This is an old switch, l1,l2,l3, no com. Should the yellow not be in l1?
 
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Thank, just put the blue into L3 on that section. Works fine.
Seems to have arced as the exposed wire was too long/not fully in as opposed to my thinking it was connected incorrectly.

Appreciate the help
 
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But don't you admire Winston for not pointing that out?
Indeed... But in the circumstances, which is offering appropriate and good advice, it would have been a fair comment to mention it's not a neutral.

AND a thankyou to Beneop for the pictures, making drawings and the feedback.

Yes it really is a good idea to replace the switch having had such an incident.
 
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