Guys a Wiggy in my back pocket was my best friend, it is unobtrusive and so handy. You whip it out and then work safely. I can't begin to tell you how many times I said Whew, I am glad I double checked that circuit. Especially on start up on New Construction or Mods.Even when we take precautions and work safe, the people around you may be in a hurry. The Electricians in this case were clueless about how our controllers are wired. They should have asked. they were probably following their prints and in a Court of Law that's what they would say to your Widow.