Make Sure the Power Is off

摘要

Household voltage can cause serious shock and even death, so the only way to work safely on wiring is with the power off. The good news is that when used as shown here, a voltage/continuity tester and a noncontact voltage tester will tell you if the power to the wires or fixtures you are working on really is off. They also can provide other valuable information about wiring and fixtures. As far as I'm concerned, these testers are must-have tools whether you're a professional electrician working on a panel, a homeowner replacing a light fixture, or a remodeler about to knock down a wall.