How to Wire a 50 Amp RV Outlet Correctly and Safely

In this post, we’ll discuss how to wire a 50-amp RV outlet so that anyone with a 50-amp RV can plug in right at home. (A 30-amp RV can also use it by using a dogbone adapter.)

Is this a DIY job? If you’re comfortable and have experience working with electrical systems, installing a 50 amp outlet can be a DIY job. But if you lack expertise in this area, we suggest calling on a professional to wire your 50 amp breaker and outlet. Electricity is one of those areas that can be dangerous if you don’t know what you’re doing.

If you are doing the job yourself, it’s important to take your time and be sure to wire the outlet correctly and safely.

So, let’s talk about how to wire a 50-amp outlet for an RV the right way – and the safe way.

What Is a 50 Amp RV Outlet?

Technically referred to as a NEMA 14-50R receptacle, a 50-amp RV outlet is an electrical outlet designed specifically for the delivery of 50-amp power. If you’ve seen our post on how to wire a 50-amp RV plug, you already know that a 50-amp outlet provides powerful electrical service.

A 50-amp circuit actually has two legs of 50 amps each. That means that it can provide a total of 100 amps of current at 120 volts (as long as you don’t go over 50 amps on either leg). The 50-amp RV power plug has four prongs, two of which carry 120V AC power, each with 50 amps of power, plus one neutral wire and one ground wire.

When you plug your RV power cord into this receptacle, you should be able to power all of your RV’s appliances and devices (though perhaps not all at once) in the same way you could if you were connected to shore power at an RV park power pedestal. A 50-amp RV outlet like the one we’re talking about basically provides shore power right at your home.

What Are the Benefits of Knowing How to Wire a 50-Amp RV Outlet?

The main benefits of having access to 50-amp shore power at home are to keep your rig’s battery bank charged and to give you a place to relax or work right on your home property with access to shore power that’ll power your RV’s appliances and devices. It also makes your RV a fantastic place for guests to stay while they’re visiting.

What Are the Safety Precautions to Take When Wiring a 50 Amp RV Outlet?

There are several safety precautions to take when wiring a 50-amp RV outlet:

1. This one’s worth reiterating: Don’t attempt a DIY 50-amp RV outlet installation unless you have some knowledge and experience working with electricity.
2. Always turn off the main breaker, shutting down all power prior to beginning any work on the installation of a 50-amp RV outlet.
3. Use the appropriate wire: 6-gauge, 4-conductor UF-rated (for outdoor use) copper wire for 50-amp service. This will have two hot wires (black & red), one neutral (white), and a ground (green). You’ll need enough to run from your breaker box to your pedestal/outlet location. If you’re running a longer distance (50-100 feet), you’ll need even heavier 4-gauge wire.

The first option listed below is an industrial-strength NEMA 14-50R receptacle that’s more reasonably priced than the popular Hubbell receptacle. We’ll link to both.

Do I Need a Grounding Rod When Adding a 50-Amp RV Outlet At My Home?

A grounding rod is a long metal rod made of copper or galvanized steel. Its job is to shunt current from lightning strikes into the earth. If you’re adding a 50-amp RV outlet at your home, you don’t need an additional grounding rod for your new outlet. A location only requires one, and the service panel that feeds your house should already have one.

If you’re installing a pedestal away from the house, you live in a high-lightning area like Florida, and/or you want to install another grounding rod, there’s no code against doing so. It’s just not necessary. Also, regardless of your setup, there can only be ONE neutral-ground bond on your local power distribution panel (usually found at the incoming service panel). You can’t have a secondary neutral-ground bond.

How Do I Mount a 50-Amp RV Outlet?

You can mount your new 50-amp RV outlet onto a wall in a garage, or to the side of your house. You can also add a pedestal and mount your outlet on that if you prefer. To do that, you’d need to secure a 4×4 into the ground by digging a hole that you’ll fill with concrete.

For the purposes of this post, though, we’re assuming the outlet is being mounted to a wall or the side of the house. The outside wall of the garage is a popular choice. Remember that 50 amp plugs are heavy, so your electrical box must be mounted securely.

Tools and Materials Needed for Wiring a 50 Amp RV Outlet

Following are the tools & materials you’ll need to install a 50-amp RV outlet at your home:

• A 50-Amp 120/240-volt circuit breaker (double-pole)
• A NEMA 14-50R receptacle
• A weatherproof mounting box and face plate (or a weatherproof RV pedestal box if you’re mounting to a pedestal)
• UF-rated 4-conductor wire (6 gauge minimum) of appropriate length
• 1″ diameter conduit (protective sheathing/covering) for the wire. (If you’re running this out to a pedestal, note that you’ll need to bury it at least 24 inches deep to be code-compliant.)
• Screwdriver
• Allen wrenches
• Wire cutters
• Wire strippers
• Metal straps/clamps to secure the cables at the wall mount or pedestal and the breaker box. If you’re running wires a long distance, you’ll need additional metal straps to secure the conduit containing your wires along its route between the electrical panel and the RV outlet.

You’ll also need an available spot in your home’s electrical breaker box. (Please see notes below.) This is where you’ll install your new 50-amp 120/240-volt double-pole circuit breaker (2 handles / 2 terminals) to which you’ll connect the two hot wires (red & black).

Step-by-step Guide to Wiring a 50 Amp RV Outlet

Wiring a 50-amp RV outlet isn’t difficult, but it’s important to do it correctly.

IMPORTANT NOTES:

We’ll share the steps to safely wiring a NEMA 14-50R receptacle below, but first… your new 50-amp RV outlet needs to be connected to a 50-Amp 120/240-volt double pole circuit breaker.

You need a double pole circuit breaker because each of the two hot leads (red & black) requires its own breaker. Your new 50-amp outlet will have two hot wires because 240-volt wiring requires two, whereas 120-volt circuits require only one (and a single-pole breaker).

Perhaps most importantly, working inside your home’s breaker panel is dangerous because the panel is always energized, even after you turn off the main breaker. This means that a mistake could potentially result in a serious or even fatal shock. Unless you have electrical expertise, you may want to consider referring work inside the panel to a licensed electrician.

Turn Off Power to Main Breaker

Shut off power to the circuit at the main breaker. Place a piece of masking tape marked with a warning over the main breaker if there’s anyone else in the house who might flip it back on as you work. Again, turning off the main breaker does not disconnect power to the lines that feed the main breaker. These lines will be hot as you work, so use extreme caution.

Use a non-contact voltage tester to ensure that there’s no power going to any of the other breakers in the box.

Locate or Install a Double-Pole Circuit Breaker

Either locate an empty double pole 50-amp 120/240-volt circuit breaker in your main breaker panel or install one. (Or have one installed by a qualified electrician.) Check out that procedure here.

Run 4- Conductor Wire Through Conduit

Run your UF-rated 4-conductor wire (6-gauge minimum) through the conduit/protective sheathing prior to connecting the wire to your home’s electrical panel and the new 50-amp RV outlet. You can use a soft conduit or a hard PVC conduit, depending on your particular application.

Strip Wire Insulation

Strip ¼ inch of insulation from both ends of each of the 4 wires/conductors using your wire strippers.

Connect Wires to the Home Electrical Panel

At the breaker box/electrical panel, first, connect the green ground wire to the ground bus in the panel and then attach the white neutral wire to the neutral bus. Then connect the red and black hot wires to the terminals on the 50-amp breaker. It doesn’t matter which hot wire connects to which terminal. Secure your conduit using one of the clamps.

Mount the Box for Your 50-Amp RV Outlet

Pull your wires through the hole at your mounting point and mount the box for your new 50-amp outlet. Make sure it’s firmly attached to the wall or pedestal, using the appropriate mounting hardware. Again, a 50 amp RV plug is heavy, so you’ll need to make absolutely sure that your box is mounted solidly.

You can use weatherproof boxes like the ones below, or you can use an appropriately-sized electrical wall box, likely a 4″ box that’s a minimum of 2 1/8″ deep with 3/4″-1″ knockouts for your 6-gauge wire.

If you’re using a wall box, you may need a box extension as well, depending on your application, along with the appropriately sized face plate. If you buy a weatherproof box, be aware that some may come with inferior NEMA 14-50R receptacles.

Connect Wires to the 50-Amp RV Outlet

Connect the wires to the 50-amp outlet (NEMA 14-50R receptacle). The terminals on the back of the outlet should be labeled to make it simple.

The green (ground) wire connects to the terminal that should be labeled “green.” The white (neutral) wire connects to the terminal labeled white.

The hot leads (red & black) connect to the terminals that are likely labeled X and Y, or they may be labeled red and black. Note that it really doesn’t matter which wire (red or black) is connected to the X and Y terminals. In a 50-amp installation, they’re interchangeable.

Tighten all screws securely with your Allen wrench.

Turn On the Power and Test the Outlet

Turn on the power at the main breaker, and use a voltmeter to check for power at your new 50-amp RV outlet.

• The voltage between the hot (red & black) wires should be 240 volts.
• The voltage between each hot wire and the neutral wire should be 120 volts.
• The voltage between each hot wire and the ground should be 120 volts.
• The voltage between the neutral and ground wires should be 0 volts.

Final Note

Despite knowing how to wire a 50 amp outlet for an RV, this may not be a project you want to consider doing yourself. We’ll say it again: if you’re not comfortable working with an electrical system, it’s best to consider calling a professional to do the installation.

Learning how to wire a 50 amp RV outlet box isn’t difficult, but working in your home’s electrical panel subjects you to dangerous current even when the main breaker is off. Again, the wires coming into your house from the service at your meter are hot at all times.

We’re big DIYers ourselves, but safety is always paramount.

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