My non-contact volt “stick” says something is live or dead, but other testers disagree. Whats up?
A non-contact voltage-presence indicator is rated to say when a certain level (or greater) of AC voltage is present. In practice I have found that that level is elastic. Lower voltages can set it off at times, especially when placing the stick very close to a wire. Also voltage induced onto a wire from nearby wires can register. So it is often helpful to confirm what a stick says using other testers and to give the others higher credibility. See my Chart of testers. Live underground cables that are still close to the earth may not register liveness for a stick.
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