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How to Check Grounding With Multimeter [4-Step Guide]

To minimize electrical mishaps, it’s critical to know if your home is grounded.

Using a multimeter is a great option to do it flawlessly. 

How to check grounding with a multimeter?

Connect the probes of the multimeter to the meter’s main body. Increase the AC voltage range as much as feasible. A reading of around 120 should be obtained. This ensures that the outlet is powered up. Disconnect the black lead from the socket and place it in the ground. If the outlet is grounded, the value should be the same.

With some basic guidelines, anyone can check their grounding easily. Here, I’ve got you covered. 

Without any delay, let us get down to business!

Checking Grounding of an Outlet with a Multimeter in 4 Steps 

The circuit’s ground wire allows any built-up power from a rapid surge to dissipate. By connecting to the ground wire and subsequently to the earthing rod.

But, only because your socket has three prongs doesn’t always indicate it’s correctly grounded. A faulty ground can cause your devices and property to catch fire.

Here I have some multimeters handpicked for you. Check them out!

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These products have good reviews on the online market. These should last longer and save you the hassle.

You may check for proper grounding in your sockets with a multimeter.Just like you can use one to test a small engine ignition coil.

Step 1: Connect the Probes

Connect the probes of the multimeter to the meter’s main body. The positive receptacle, labeled “Volt,” receives red. 

The black wire goes into the ground terminal, which is labeled “COM.”

Step 2: Set the Multimeter to the Maximum AC Voltage it can Handle

Select the maximum AC voltage range on the multimeter. The AC voltage is denoted by the letters “VAC” or “V.”

Step 3: Insert the Test Leads

The two leads should be inserted into hot and neutral sections of the output. 

The smaller prong receives red, while the bigger one receives black. The hot wire, which transmits electricity from the main box to the outlet, is the smaller prong. 

You should receive a value of around 120, which means the outlet is getting electricity.

Step 4: Check the Reading

Disconnect the black lead from the socket and place it in the ground. It should be showing the same reading. If this isn’t the case, the outlet isn’t correctly grounded.

It’s also conceivable that the hot and neutral wires have been switched around. To be sure, connect the red lead to the left outlet. Then plug the black lead into the ground. 

The wires are inverted if you receive a reading. the socket isn’t grounded if it doesn’t happen.

Checking Grounding of a House with a Multimeter in 4 Steps

It’s critical to have your house grounded to avoid accidents. This lets the extra electricity go into the ground

With a simple multimeter, you can check if your house is grounded. But always use safety while dealing with electricity.

Step 1: Examine the Electrical Outlets

Examine your home’s electrical outlets. The presence of two-prong or three-prong outlets is the first evidence of good grounding. 

There is a small hole, a bigger hole, and a “U-shaped hole” in a three-prong outlet. The grounding component is the U-shaped hole.

Step 2: Plug the Probes into the Socket

Insert the circuit tester’s red probe into the little hole. The hot wire connects the appliance to the power source.

To complete the circuit, insert the black probe into the outlet’s large slot. This is the neutral slot.

Step 3: Look For the Warning Lights

Take a look at the warning light. If the socket is grounded, it will light up. Alternate the probes if it doesn’t light up. 

The outlet is correctly grounded but wired reversed if this light turns on. If neither test results in light coming on, the socket is not grounded.

Step 4: Repeat for All Outlets

All steps 1 through 4 should be repeated in all of your home’s outlets. It’s logical to assume that if one socket is correctly grounded, they’re all grounded.

Many old houses have undergone extensive renovations. It’s possible that not all outlets were rewired to the ground.

Why is Grounding So Important?

Broken circuits or electrical surges can be dangerous to you and your house. Thus grounding is important. 

When there are power surges, the extra energy is injected into the system. That may jump out of the wire. 

This stray voltage might ignite a fire, damage electronics, or stun bystanders if it isn’t grounded.


What are the differences between grounding and earthing?

Answer: The phrases “earthing” and “grounding” are almost interchangeable. The term “earthing” refers to a circuit that is physically connected to the ground and has a voltage of zero volts.

Is it possible to utilize any cable as a ground wire?

Answer: The most common form of grounding wire is bare copper wire. Gauged copper wire can also be used. 

Is it possible to use black wire as a ground?

Answer: Black cables are never utilized as a ground line, but rather as the power supply for a switch or outlet. They’re particularly frequent in residential areas.


You now understand how to check grounding with a multimeter. I’ve gathered all of the information you require. You must not disregard any information since it is crucial.

Before I leave you, I’d like to offer you some advice. Always wear protective gloves and work in dry places while dealing with electricity. 

It will protect you from a variety of threats.

Best regards!