Light switch reversed after transformer blew in the ceiling

It's very hard to see how anything to do with the wiring in the ceiling/light could affect how the switch operates.
The only thing I can think of is that instead of the switch being in series with the 'transformer' primary, it has been mis-wired across the seconday, and the 'transformer' is actually a switch-mode power supply so is not destroyed by its output being shorted.
Yes, I suppose that's not impossible - but (without doing a bit of thinking/scribbling) I suspect that it would require at least two wiring errors, and I would have thought quite difficult to perpetrate if one was just doing a 'like-for-like' replacement of a 'transformer'!

picklepass: Is there any chance of a photo of the connections to the light/transformer?

Kind Regards, John
 
I was thinking that the primary is getting an unswitched live and neutral due to a wiring error.
To achieve that, and simultaneously to get the switch connected across the 'secondary' (output) would require a pretty impressive 'shuffling' of connections, I would have thought :-)

Kind Regards, John
 
Its a kaoyi Ktb-105w/va soft start surface mount round transformer. If its dimmable would it make a difference. It does say its dimmable via primary. X
 
sounds like the tx is connected to a loop in joint, and the tx is connected across the feed and switched live, rather than the switched live and neutral.

OP are the lights as bright as they used to be?
 
Its a kaoyi Ktb-105w/va soft start surface mount round transformer. If its dimmable would it make a difference. It does say its dimmable via primary. X
Fair enough - that's a 'real' transformer, not one of the electronic gizmos people often call transformers these days. That probably puts paid to stillp's suggestion (something would probably have gone bang if the switch had been wired across the secondary of that), but doesn't move us on much. As I asked, any chance of a piccie of the wiring?

Kind Regards, John
 
sounds like the tx is connected to a loop in joint, and the tx is connected across the feed and switched live, rather than the switched live and neutral.
How would the light then come on (even if dim) when the switch was 'off' (i.e. switched-live floating)?

Kind Regards, John
 
Im not sure they make a two gang in one way
Im quessing the fault currents damaged the switch internally and its somehow making contact across the opposite L contact to what its actually connected
 
sounds like the tx is connected to a loop in joint, and the tx is connected across the feed and switched live, rather than the switched live and neutral.
How would the light then come on (even if dim) when the switch was 'off' (i.e. switched-live floating)?

Kind Regards, John


There would need to be another light(s) on the same switched live. I was assuming downlighters as it / they are transformer fed.
 
sounds like the tx is connected to a loop in joint, and the tx is connected across the feed and switched live, rather than the switched live and neutral.
How would the light then come on (even if dim) when the switch was 'off' (i.e. switched-live floating)?
There would need to be another light(s) on the same switched live.
Ah - right. However, the OP is now telling us that the lamp is 'brighter' (which presumably at least means it isn't dimmer than before), which may put paid to that idea :-)

Kind Regards, John
 
Im not sure they make a two gang in one way
Same here - but even if it's two way, the OP insists that the switch hasn't been touched, so it's unlikely that a conductor has jumped out of one terminal of a two-way one into a different terminal :-)
Im quessing the fault currents damaged the switch internally and its somehow making contact across the opposite L contact to what its actually connected
A rather fascinating possibility - if so, that would be a pretty 'exotic' fault!

Kind Regards, John
 

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