How to Check an Electrical Outlet
To check an electrical outlet, use either an outlet tester or a multimeter.
An outlet tester is a small device used to test if a three-pronged outlet is working, and also if it is wired properly. They usually check up to 125 volts. In appearance, one end of it looks like a plug, and the other end has three lights. These lights will display certain color combinations to indicate that the outlet is working properly.
To obtain an actual voltage reading from the outlet, use a digital or analog multimeter.
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Instructions
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Outlet Tester
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1
Place the outlet tester into the wall outlet.
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2
Observe and record which of the colors lights up.
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3
Compare your notes with the manufacturer's instructions on the back of the tester, to determine if the receptacle is working and is wired properly.
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4
Remove the tester from the outlet.
Multimeter
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5
Place the multimeter on the AC setting, which is typically indicated by a wavy line near the switch or button. It may also be written on the device.
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Select the proper maximum voltage setting. For example, since the voltage from the outlet will be around 120 V, do not select 100 volts as a maximum.
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Place the black probe and the red probe into each of the openings in the outlet. The placement or polarity of the probes does not matter.
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8
Observe and record the voltage measurement. For regular outlets in the United States, the reading will be from 108 to approximately 120 volts.
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9
Remove the probes from the outlet.
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1
Tips & Warnings
Electricity is dangerous. Do not ever test an outlet with a multimeter on the wrong setting. For example, do not ever do an ammeter or continuity test. You will risk damage to the device, electrical shock, fire, or burns.
Electricity and water do not mix---never test an outlet with wet hands, and always make sure the testing devices are dry.
Not all outlet testers perform equally well, and so they may give readings subject to misinterpretation.
A professional electrician should be hired to check an outlet that is believed to be damaged.
