How To Test an Electrical Outlet With a Multimeter in Quincy, MA

If you have problems with an intermittent electrical outlet in your home, you might worry about a short causing a fire. You can seek repair help from our professional electrical services in Quincy, MA. However, you may first want to determine how to test an electrical outlet with a multimeter on your own. 

Most people can use a multimeter tool while following basic safety precautions. Learn more about the steps for operating this tool and reading the multimeter settings.

Is a Multimeter Safe To Use in Quincy, MA?

A digital multimeter is a handheld device used to measure the performance of your electrical wiring. For those with basic needs, you can find this tool for around $25. Professionals might spend a few hundred dollars or more for a unit that can take more precise measurements than a homeowner needs.

The multimeter has prongs that you’ll insert into the outlet. It uses this connection to measure things like voltage or resistance from the electrical current. 

Through the measurements, you can spot problems with the wiring while minimizing your risk of an electrical shock. Most people can use this device safely because they don’t necessarily have to expose live wiring or disconnect the outlet to take the measurements. Just keep your fingers away from the metal on the probes when testing.

If you have an older home and aren’t sure whether the wiring has been updated, the multimeter can help you spot wiring issues. The population in Quincy, MA, grew significantly in the first half of the 20th century, meaning quite a few older houses exist here. 

If you believe you have older aluminum wiring in your house and the multimeter shows intermittent performance from an outlet, reach out to an electrician. Aluminum wiring can become brittle as it ages, increasing the fire risk.

Different Ways You Can Test an Electrical Outlet With a Multimeter

When learning how to test an electrical outlet with a multimeter, you have a few different methods to use this measurement tool. 

Measure the Voltage Going Through the Outlet

Voltage testing is a common reason for using this tool. Higher voltage measurements indicate that the electrical flow is appropriate. 

To measure voltage, insert one probe into one rectangular slot in the outlet and the other probe into the adjacent slot. A properly functioning outlet will create a digital readout between 110 and 120 volts on the multimeter.

Determine Whether the Outlet Is Grounded

When learning how to test an electrical outlet with a multimeter, you can verify whether the outlet’s grounding wires are properly installed. You can also measure polarity, which ensures the hot and neutral wires were not reversed when someone installed the electrical outlet.

To do ground wire testing, place one probe inside the smaller rectangular slot in the outlet and touch the screw in the center of the outlet plate with the other probe. You should again receive a reading between 110 and 120 volts. 

If the multimeter shows that you have an incorrectly grounded electrical outlet, it needs rewiring or replacement. This work usually requires a local electrical permit. 

Local building codes in Quincy, MA, only allow licensed electricians to obtain these permits. This means you cannot rewire the outlet yourself and remain within the local building code. The City Wiring Department in Quincy, MA, will inspect the electrical work as part of the permit.

Test an Outlet for Proper Construction

Doing a continuity check means testing whether the manufacturer properly constructed the outlet. You’ll have to remove it from the wall, so shut off the power to the outlet before disconnecting it from the wiring. Set the multimeter to measure ohms.

You can insert a probe into one of the outlet slots and touch the other probe to the adjacent terminal screw. The tool should show that continuity is occurring. Then test the other outlet slot. If you receive an error, you might have a broken outlet.