How to Check a 220 Volt Electrical Outlet

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By eHow Contributing Writer

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Many high voltage outlets that are 220 to 240 volts typically have three openings. Two of them are live and ground respectively, and they are across from each other. They normally are slanted at 45 degrees, though some are vertical. Older ones are semicircles. The third opening is neutral, and it ordinarily has a vertical shape. It is usually positioned below the first two.Some outlets have four slots, in which case there is an additional neutral opening. This additional opening may be vertical, roundish, or an "L." To test the outlets, use a digital or analog multimeter.

Difficulty: Moderately Challenging

Instructions

Things You'll Need:

Digital or analog multimeter

Step 1

Place the multimeter on the AC setting, which is usually indicated by a wavy line near the switch or button. It may also be written on the device.
Step 2

Select the proper maximum voltage setting. This must be at least 240 volts.
Step 3

Test the voltage between the two slanted slots by placing one probe into each of them. The multimeter reading should be approximately 220 to 240 volts total.
Step 4

Readjust the voltage on the multimeter to a lower setting. This should be 120 volts or higher.
Step 5

Examine the voltage between the slanted opening on the left and the neutral one. Do this by placing a probe into each of them. The multimeter should read approximately 110 to 120 volts.
Step 6

Examine the voltage between the remaining slot and the neutral one by placing a probe into each of them. Again the multimeter should read approximately 110 to 120 volts.
Step 7

Remove the multimeter from the receptacle.

Tips & Warnings

Electricity is dangerous. A 240-volt outlet may be extremely 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, severe to lethal 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.
Hire a professional electrician to check an outlet that you believe is damaged.