Re: You've never rewired house lights have you
I seriously hope you never have either.
The light switch on the wall switches the mains voltage. The transformer(s) are connected after the switch. If your switches are switching the low voltage you would also need to provide a means of isolating the transformer.
The only time the switch doesn't directly switch the mains voltage is when the lights are controlled by some sort of automation system then the switches control the controller which controls the lights but this kind of setup isn't common in a domestic setting.