The Multimeter
3. Using a Multimeter to Check for Voltage
If you're feeling a bit more confident and have a multimeter handy, you can use it to get a more precise reading of the voltage in a wire. A multimeter is a versatile tool that can measure voltage, current, and resistance. But be warned: using a multimeter requires a bit more knowledge and caution than a non-contact tester.
First, set your multimeter to the AC voltage setting (usually marked as "V~" or "VAC"). Choose a voltage range that's higher than what you expect to find in the wire you're testing (for example, if you're testing a standard household outlet, set it to 200V or higher). Then, carefully insert the multimeter probes into the appropriate terminals. For a standard outlet, you'll need to insert the probes into the hot and neutral slots.
The multimeter will then display the voltage reading. If the reading is close to the expected voltage (e.g., 120V in the US), then the wire is live. If the reading is zero, or very close to zero, then the wire is likely dead. However, it's crucial to double-check your connections and settings before making any assumptions. A loose connection or an incorrect setting can give you a false reading.
Again, safety is paramount. Make sure you're wearing appropriate safety gear, like insulated gloves and safety glasses. And if you're not comfortable using a multimeter, don't risk it. Leave it to the professionals.
