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It's all about induction. It is not about the difference in voltage between the two coils. The voltage that exists in the secondary coil only exists as a result of the voltage in the primary coil, it is induced. The 12V in the secondary coil will remain in the secondary coil for as long as...

Should point out it is for my own hoose so if anyone gets plated from dodgy unmarked wiring it will be me!

Elvis is back in the building! I am liking your style guys, much praise and many thanks. The two way switch did occur to me but I couldn't quite get my head round it so cheers again. Yet again I escape the pesky relay!! Guiness Drink

I am installing an inline fan for a bathroom and utility room. 1 inline, timer fan, ducted into the bathroom and the utility room. I want to switch the fan from the bathroom light and I want a separate switch (on the lighting circuit but not operated by the light switch) in the utility room...

Hi, I am a self employed electrician working in Glasgow... hope to get some help/chit chat and happy to give some too if I can!! Elvis