Discuss 2 way switch induced voltage? in the UK Electrical Forum area at ElectriciansForums.net

It's far more likely to be a capacitively coupled voltage rather than induced.
But it's largely irrelevant as it I'll be easily identified either way if you are using the correct test equipment and understand how to interpret the results it gives you.

It is possible that if the switch is failing then there may be putting a high resistance connection in series with the load, acting as a potential divider
, thus presenting 43V at the switch terminal. But again using the appropriate test instrument and understanding the readings given by it will clear the matter up.

A phantom voltage such as this will not interfere with your dead testing due to the fact the circuit will be dead! Theoretically it could be an issue where multiple circuits are in close proximity and some remain energised, but I've yet to come across this being a problem for an MFT.
 
The faulty light switch is not related to the 'induced' voltage I must add!

Thanks for the input anyway Davesparks always appreciated, I will look into it further when I can be arsed..........

The reason I noticed it was because the LED bulb I was using was slightly dimmed when off lol
 
250V is not high, it is correct. All UK substations are set to output 433/250V, regardless of the nominal voltage fairy stories you read about.

And yeah yeah that is the case, I was just putting the high voltage in with the rating of the switch being 250v, thought it may have caused a problem due to a poor switch, was just putting it out there.
 
The faulty light switch is not related to the 'induced' voltage I must add!

Thanks for the input anyway Davesparks always appreciated, I will look into it further when I can be arsed..........

The reason I noticed it was because the LED bulb I was using was slightly dimmed when off lol

That suggests to me that the switch was goosed and causing a high resistance to be in series with the lamp when switched off. Capacitive coupling normally manifests as flashing low energy lamps rather than permanent dim illumination.
 

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