What's with the cavalier attitude on a DIY forum? Killing power to the 24VAC transformer doesn't hurt anything; and it's just good practice to disconnect anything electrical from its source before working on it.
Location: south east of omaha/The island of misfit contractors
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Need to replace
Nothing cavilier about it,you can have the power company shut power off to the whole block if it makes you feel better!
Just saying its not a major deal to do it with the power on is all.
But by all means do it however you like!
"facts" have no relevance to this discusion
Posting from a concrete bunker under a non descript barn