January 23, 20188 yr 3 hours ago, Roly said: Test it on a known live source before and after you test the circuit your working on. That way you know it is working. Roly Hi Roly, I don't see you posting much these days. Good to see you are still here though. And yes, test it out before flipping the breaker.
January 23, 20188 yr 6 hours ago, Cal said: From the voice of experience - those are ok, but can (may be notorious for) giving a false positive reading. My BIL & I chased a false positive for nearly two hours this past summer before locating the source - a live extension cord about 5 feet away! I use it all the time and feel pretty confidant when it shows no juice though. I am an electrician, and yes, many a false positive with these, however I have NEVER had a false negative. Much safer to think a dead wire is live, than a live wire is dead. Most of the false’s I have experienced, have been in situations where there are multiple circuits in a raceway. Especially with 277/480 volts. The magnetic field gets induced into the dead conductor for a small distance.
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