What size wire for 50 amp Rv service?

What size wire for 50 amp Rv service? Full Guide

two Different 50 amp wires

The best wire for 50 amps is a 6 AWG wire. For longer runs, you can use a 4 AWG wire. Whether you have a 30 amp, 40 amp or a 50 amp breaker, wire size is essential. Before you take on any type of wiring job, be sure to know the exact size wire you need.

If you are in the market for a 50 amp wire, i would choose this 6-gauge wire from WINDYNATION on AMAZON.

If you will be making longer runs than say 100 feet, you can choose to use a 4-gauge wire from GEARIT on Amazon.

What is gauge and AWG

Gauge is the measurement of a wire, particularly its size. AWG is the standard system used for this measurement. Wire gauge is determined from high to low with greater numbers suggesting a smaller sized wire size. Accurate wire sizing is necessary for a breaker as it assists in figuring out just how much of a electrical current can pass through it safely and just how much resistance it will have.
Please keep in mind that the details within this short blog post is just a simple look on the basic standards. For any concerns that you may have, seek advice from a electrical contractor that is licensed and certified, along with your regional electrical codes.

The table below will inform you on what wire size is required for the amount of power that will be going through the line when using either copper or aluminum

What are the different Wire Sizes & Amp Ratings

Copper Aluminum
Wire Gauge Size 60°C (140°F) 75°C (167°F) 90°C (194°F) 75°C (167°F) 90°C (194°F)
14 15 20 25 --- ---
12 20 25 30 20 25
10 30 35 40 30 35
8 40 50 55 40 45
6 55 65 75 50 55
4 70 85 95 65 75
3 85 100 115 75 85
2 95 115 130 90 100
1 --- 130 145 100 115
1/0 --- 150 170 120 135
2/0 --- 175 195 135 150
3/0 --- 200 225 155 175
4/0 --- 230 260 180 205
250 --- 255 290 205 230
300 --- 285 320 230 260
350 --- 310 350 250 280
500 --- 380 430 310 350
600 --- 420 475 340 385
750 --- 475 535 385 435
1000 --- 545 615 445 500

30 Amp Rv Plug VS 50 Amp Rv Plug

A 30 amp rv plug is different from a 50 amp rv plug. Below you will see the difference between both. The on the left is a 30 amp plug as it only has 3 prongs, the one on the right is a 50 amp plug as it has 4 prongs.

30 Amp Rv Plug VS 50 amp Plug

You can read all about a 50 amp rv plug in this post.

How many electrical systems are in an rv?

An rv consist of 2 electrical systems that we all need to know about. The first one is the 120-volt system which is used to power larger electrical home appliances such as your tv and your kitchen area appliances that use up more electrical energy. The essential thing is to always remember what size wire for 50 amp Rv service.

Secondly, there is a 12-volt system which is powered by a 12-volt battery. This can power home appliances such as Rvs electrical plug or by a generator.

Some of the best 50 Amp Rv Plugs for rv and wires you can buy today

If you have a project coming up and you are in need of a 50 amp wire, here are a few that will be perfect.

Want to know the wire sizes of other amperages? Visit some of our other pages below.

Ask yourself these questions when you want to use 50 amps

  • What type of condition will you be running the wire?
  • How far away will the wire be ran or how long will the wire be?
  • What voltage will be running through the wire?
  • How much voltage drop will be allowed throughout the run of the wire?

What happens if you use the wrong wire size?

You should never use a wire that is not suitable for the amperage that it will carry. The wire might possibly melt in a worse case scenario or overheat. Say for instance you need to use the correct gauge for a 50 amp wire but instead you use a gauge that is rated for only 40 amp. This will overload the wire and probably cause a fire.

Using a smaller than needed wire is always a bad thing but on the other hand, using a larger wire than needed is not really a bad idea. Using a larger than needed wire might only be an inconvenience.

Circuit Breakers

It's always best to know what amperage your circuit breaker will allow. If your circuit breaker is rated for 50 amps, you cannot safely use appliances or electronics that draw more than 50 amps. This will cause an overload and possibly a fire.

Is 6 AWG necessary for 50 amps?

This is the best size wire for 50 amp Rv service. This is the wire you want to use for many reasons. The main reason is that a 6 AWG wire will be able to carry 50 amps safely without getting overheated.

Here are 6 reasons why 6 AWG wire is usually chosen over other wire sizes

  • It's more affordable than a 4 AWG wire.
  • It's easier to work with, especially if you're not a professional.
  • It's common for people to use 6 AWG for 50 amps.
  • It's a lot easier to get your hands on a 6 AWG wire than a 4 AWG wire.
  • The wire is thicker and can withstand more heat than a smaller gauge wire.
  • It's able to withstand an excessive amount of power that the majority of RVs won't ever require.

Aspects to consider when choosing wire size

  • Length of the wire
  • The best option when figuring out what size wire to use at certain lengths is to consult a professional and get their input on the job you are about to partake. However, rule of thumb is to go up one size larger than your job requirement if your wire is inside a conduit, ganged with other wires which inhibits heat dissipation, or your run exceeds 100 feet.

  • Type of wire material
  • If you are utilizing a wire that is not made from brass, silver or copper, it would be best to check and see if a different size is required. Aluminum wires are known to be much less common than ones made with copper, and they likewise differ from them in certain requirements. Aluminum uses roughly 61% of the conductivity of copper wires.They however weigh 70% less than copper wires.

50 amp Aluminum Wire

Aluminum wires are ranked in a different way than copper wires are. For a 50 amp aluminum wire, you should use the No. 4 AWG. The smaller sized the number on the wire is, the larger the wire size. For instance No. 4 is larger in size than the No. 6. Aluminum wires are available in various types. Types RHW and THWN are the most typically utilized ones. No. 6 is only usefully good up to 40-amp.

50 amp Copper Wire

For copper wire, No. 8 or No. 6 THWN should be used. No. 6 copper wire can support approximately 55-amp at a temperature level of around 60 degree Celsius. No. 6 wire is highly suggested. It's always best if a larger size wire is utilized..

What is Voltage Drop

Wires bring current constantly have fundamental impedance, or resistance to the existing current flow. Voltage drop is specified as the quantity of voltage loss that happens through part or all of a circuit due to impedance.

A typical example that is usually used to discuss voltage, existing and voltage drop is a garden hose pipe. Voltage is comparable to the water pressure provided to the hose pipe. Current is comparable to the water streaming through the water hose. And the fundamental resistance of the pipe is figured out by the type and size of the tube - similar to the type and size of an electrical wire identifies its resistance.

Extreme voltage drop in a circuit can trigger flickering of lights or they will burn poorly, cause heating units to heat improperly, and motors will run hotter than regular and stress out. This condition triggers the load in a way that they have to work with less voltage pushing the current and work harder.

Three percent of 115 volts is 3.5 volts if the circuit voltage is calculated at 115 volts. This indicates that voltage that is lost from the wires in a circuit shouldn't surpass 3.5 volts. The outlet must still have 111.5 volts or 115 - 3.5 to be supplied at all times. Most appliances or devices need an extension cable to plug into some sort of outlet, some voltage drop will take place in the extension cable too. Some motors will definitely not run properly, and might even burn up, if the voltage at the motor is allowed to fall too low.

To help measure voltage drop and amperage, here is a multimeter that has great reviews from amazon.

What does a 50 amp rv cord look like?

50 amp rv cord

Here is a look at 3 different views of the 50 amp rv cord. You can distinguish this cord from a 30 amp rv cord by counting the amount of prongs it leads to. A 50 amp cord will have much thicker wires that lead to 4 prongs. A 30 amp cord has 3 wires that lead to prongs and a thinner wire.


Gauge Amperage
2-gauge wire 95 amps
3-gauge wire 85 amps
4-gauge wire 70 amps
6-gauge wire 55 amps
8-gauge wire 40 amps
10-gauge wire 30 amps
12-gauge wire 20 amps
14-gauge wire 15 amps

60 amp wire size

The best wire to use for 60 amps is to use a wire gauge of 4. There are however some cases where a 6 gauge wire will be sufficient.


To use a maximum of 50 amps, you will need a wire gauge of 4. There are some electronic devices in our household that require only a maximum of 40 amps. However, there are some appliances that will need 50 amps, such as a washer or dryer. You can sometimes even use a wire size of 6 for 50 amps but the smaller the number on the gauge scale is the better. This is because the lower the number on the gauge scale is, the thicker and more durable the wire is. This is especially true if you plan on running the wire for more than 100 feet.


To safely use a maximum of 40 amps, you will need a wire gauge of 8. This will allow you to safely use items in your house such as an electric cooktop.


To use a maximum of 30 amps, you should use 10 gauge wire.

What happens if you use the wrong wire size for 50 amp rv service?

It is exceptionally harmful for anyone to try and use a wire that has a smaller sized gauge than required. The wire might melt and get too hot. This might result in breaker or home appliance damage and be a high fire risk.

If you use a wire that has a bigger gauge than required, there will be close to zero percent chance of something going wrong. It can be a hassle, given that a bigger wire is normally much heavier and stiffer, however it will not cause any prospective dangers.

Solid Wire vs Stranded Wire

stranded and solid wire

Another thing to remember is to pick the design of wire that will best fit your requirements. Some wires are made up of solid copper conductor while some other wires are stranded. In setups utilizing some sort of metal conduit, the solid wire does not easily pull as quickly if the channel has a great deal of bends. However, solid wire is generally simpler to be secured under screw terminals. These screw terminals can usually be found on basic switches and receptacles. 14, 12, or 10-gauge wire that is a great copper conductor and is usually the best choice for residential circuits.

When should you use stranded wire?

Stranded wire is used for many applications, and can be considered a step up from solid wire in terms of flexibility and resistance to fatigue. Here are some common reasons an electrician would use stranded wire:

  • Whenever you need a wire that is more flexible than solid wire, stranded wire should be chosen.
  • Stranded wire handles more flexing without breaking than solid wire. If you have an application where the wire needs to bend frequently, or where it needs to be very flexible, stranded wire is ideal.
  • It's less likely to break under stress: Stranded wire is made up of several small wires wrapped together. If a single strand breaks, the wire will still work, but if a solid wire breaks, the conductivity will be interrupted.
  • It's easier to work with: Solid wire is stiff, and it's harder to bend. Stranded wire is more flexible and easier to work with overall.
  • It's more shock resistant: Solid wire has a tendency to break off at the insulation when it's bent too much, but stranded wire flexes better and lasts longer in high-impact environments.
  • Stranded wire can be used in places where solid wiring might not be practical. For example, if you need to extend an existing cable by a few inches, then you could use stranded cable for the extension because it's easier to work with than solid cable.
  • Stranded wire may look different than solid wire, but it is readily available at any home improvement store. It is also just as safe if used in the correct application.
  • Hi-temp applications - stranded wires can withstand much higher temperatures than solid wires for a given gauge size.
  • Using stranded wire also makes your job easier and more foolproof. Just make sure that you don’t accidentally crush the conductors while tightening your connections. And if you need to splice or extend any wiring, use a terminal block for a clean, secure connection every time.

When should you use solid wire?

When it comes to wiring projects, electrical wires come in two varieties: solid and stranded. The type of wire you choose depends on the application. Here are some reasons why a solid wire might be chosen:

  • It's easy to strip, which makes it easy to use.
  • It's easy to splice together, which means you can cut it and put a new piece in place when it breaks.
  • Solid wire is cheaper than stranded wire, which means you can buy more of it and not spend as much money.
  • A solid wire will conduct electricity better than a stranded wire.
  • Solid wire is used almost exclusively for household wiring, where flexible stranded wire wouldn’t be appropriate. Solid wire is normally in the form of ‘single strand’ wire, where there is only one length of copper running from the source to the destination. In some instances, solid wire can be in ‘multiple strand’ form, where two or more lengths of copper are twisted together. This kind of wire is typically used in high-current applications such as electrical mains cable.

A simple answer as to why solid wire is used for household wiring would be cost, it is much cheaper than stranded wire. Solid wire isn’t as flexible as stranded wire and this makes it more difficult to fit into tight spaces. However, because of its simplicity and low cost, it has been the standard material used for domestic electrical wiring since the introduction of electricity into our homes.

What does resistance and heat have to do with wiring?

Resistance and heat are the main reason why you shouldn't go overboard with wiring. You can have the best wire in the world, but if you try to pull too much power through it, it will still overheat.

To understand how this works, you need to know about two things: what resistance is, and how electricity behaves as it flows through a wire.

What is resistance?

Resistance is a property that all materials possess — it's basically how much they oppose the flow of an electrical current. Some materials like silver and copper are very conductive, meaning they oppose current very little, while others like glass and rubber are nonconductive, meaning they oppose current a lot.

If you want to push a lot of current through a conductor (like a wire), you could use something with low resistance (like copper), or something with high resistance (like glass). But if you push too much current through either one, they'll both start to heat up.

To fully understand resistance and heat, you need to understand how electricity works. Electricity is defined as the movement of electrons from one place to another. Electrons are negatively charged particles that are found in atoms.

Electricity is generated by power plants by spinning turbines through the use of heat, magnetism, or some other means. The electricity then travels along transmission lines to a substation, where voltage is reduced so it can be used for commercial and residential applications.

Resistors control the flow of electricity in your home because the wires are made out of a material called copper and copper has a lot of free electrons in it. As these free electrons travel down the wire from one point to another, they bump into other free electrons in the wire causing friction. This friction produces heat in the wire as energy is lost in the form of heat energy.

That's why all your electrical appliances get hot when they are plugged in and switched on, they are losing energy due to resistance.

If you were designing an electrical system and you knew how much current would be flowing through wires connecting various components (such as light bulbs) you could predict how much heat would be produced by those wires and make them thick enough so that they did not catch fire or melt due to the heat energy produced.

Some basic uses of wires in everyday life

Wire Use Rated Amperage Wire Gauge
Lamp cords and Low-voltage lighting 10 amps 18-gauge
Light duty Extension cords 13 amps 16-gauge
Light fixtures, lamps, lighting circuits 15 amps 14-gauge
Outdoor receptacles (outlets), Kitchen, bathroom, 120-volt air conditioners 20 amps 12-gauge
240-volt window air conditioners, Electric clothes dryers, electric water heaters 30 amps 10-gauge
Ranges and Cooktops 40-50 amps 6-gauge
Large electric heaters, Electric furnaces 60 amps 4-gauge

What if you want to install your own 50 amp service in your home?

50 amp service for homes

It is not hard to install your own 50 amp service in your home if you know what you are doing and with the right directions to help you along. Below i will list all the materials and tools needed and a step by step guide to complete the job.

Things you need to install a 50 amp service in your home

  • Voltage meter
  • 50-amp Breaker
  • Electrical tools kit
  • RV pedestal hookup
  • UF-rated 6 gauge 4-conductor wire
  • Plastic zip ties
  • 50-amp outlet (optional)

Cost to install 50 amp rv outlet

The cost to install a 50 amp rv outlet can vary from $200 - $350 if you plan on doing it yourself or it could cost up to $1,300 if you plan on hiring a professional. There are many different costs that you have to take into consideration as some states will require you to have a permit and inspection on the job that is done. These permits can cost up to $200.

How to wire a 50 amp rv plug?

50 amp rv plug wire colors

Here is how you wire a 50 amp rv plug. It is not that hard if you just follow the color codes and the correct prongs.

  1. First Step: The first thing you need to do is to get all the required items to complete the job. You do not want to start the job and then have to stop and head to the store.
  2. Second Stop: Secondly, if you are going to be replacing a wire that was already in use, be sure to disconnect any power that will be leading to the plug.
  3. Third Step: If you haven't already labelled your wires, now would be a good time to add labels to the wires. Adding labels to your wires will make the job easier next time if you happen to redo the job for some reason. It will also help if someone else will be doing the job next time.
  4. Fourth Step: Check with the wire's manufacturer to find out all you need to know about the colors. Next thing to do is to attach each wire to their designated prong. You should wire the white wire to the neutral prong. The red wire goes to Hot #1 Prong. The Black wire goes to the Hot #2 prong. Lastly, the orange or green wire goes to the ground.

Is a 50 amp RV plug 220 or 110?

If your 50 amp plug has four prongs then it is 220 volts. The prongs will be: one neutral, one ground, and the other two will each be 110 volts each.

How to install a 50 amp RV outlet at home

  • Disconnect your breaker panel. The supply to your breaker board will likely be split in something known as single phase. Single phase simply means that there is a single ground connection and a neutral connection along with two hot wires that serve your breaker.
  • Test your wires - Pull the wires then link them all to your panel. This is the outdoors receptacle. Then, install your 50 amp breaker (double-pole) into the sub-service box. Please bear in mind the different colors of wires. This will help you in identifying the place and the placement of the wires.
  • Different colors- Can you locate the red wire? You will need to attach it to a breaker terminal that is located on the outlet side. After attaching that, continue to the black wire. Try to find the other terminal, which lies in the outlet location of the breaker. The white wire needs to be attached to a neutral bus-bar. Next comes the green wire, this is the bare one and ought to be attached to the grounding block.
  • Final steps - The half-round receiver is the green one. Prior to covering up your last connections, be sure to wire your receiver to the opposite of the green one (half-round receiver). The terminal screw is the white-colored-one. You are required to attach the the Y configuration to the red wire and to a single screw. On the opposite side of the breaker, attach the X configuration to the black wire. This is the very same for the other single screw on the breaker. Remember that Y and X are interchangeable.
  • Test Test Test - Turn the lever into the "on" position for the main breaker. Next, you need to switch on the double-pole breaker. This ought to work as your brand-new 50 amp outlet. To read your output, place your probes on the neutral receiver and one on the hot receiver. The reading you should get is 240 volts. Be sure that you check more than once that the output is showing 240 volts, particularly after experimenting with the voltage meter. After testing it more than once, test it on your rv.

Can 6 gauge wire handle 50 amps?

6 gauge wire

Yes, a 6 gauge wire can definitely handle 50 amps. A 6 gauge wire will handle amperage all the way up to 55. You will find that most appliances use a 50 amp breaker.

Can 8 gauge wire handle 50 amps?

6 gauge wire

No, 8 AWG may be used to handle up to 40 amps. A 8 AWG wire can handle up to 70 amps in free air.

Can 10 gauge wire handle 50 amps?

6 gauge wire

No, a 10 gauge wire can handle up to 30 amps.

What size wire for 50 amps at 150 feet

To run 50 amps at 150 feet, you can use No. 4 AWG. The larger the wire diameter is defined by the smaller numbers on a wire.

What exactly is an electrical range?

An electrical range is has do do with appliances such as in a kitchen where a stove needs electricity to operate. Electric current is converted into heat which in turn provides a means for cooking.

So what wire size for 50 amp range?

This all depends on the type of appliance. However, most ranges require a 50 amp 240-volt circuit that is wired with a 6 gauge wire. A 4 gauge wire will be best if the current will be travelling longer distances.


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6/3 wire amp rating

6/3 wire is a wire rating used in your average residential wiring services for things like outlets, switches, and a variety of other things. A 60 Amp breaker is usually used with this type of wire. The "6" refers to the guage rating of the wire, and the "3" refers to the amount of wires present. There are usually 3 wires present, accompanied by a fourth which is a bare conductor. In this case, 6/3 means that it is rated at 6 AWG or 6 gauge, and is equipped with three stranded conductors (or wires).

If you're in the market for 6/3 wire, here are some links on amazon:

A 6/3 wire can be constructed using other types of materials such as aluminum or steel. It's normally used in industrial applications where the electrical current is greater, but is suitable for electricity needs in some residential locations as well.

As for what "AWG" means - it's an acronym that stands for American Wire Gauge. This system of measurement was standardized in 1857 by a committee from 7 New York and Boston based wire manufacturing companies. The American version is nearly identical to the British Imperial Standard Wire Gauge , except ours doesn't have any fancy numbers (such as 40/28), it's simply numbered from 1 through 54. Before AWG came along, gauges were measured differently depending on which country you were in at the tim. After two standards for gauging wire were unified, they eventually became standardized all across the world, making international trade easier.

Safety Precautions When Working With Electricity

When handling electricity, say for instance, you're wiring an rv outlet, you need to take certain precautions into consideration. Here are a few precautions you need to take in order to stay safe and out of harms way.

  • Use electrical gloves, these types of gloves are needed when operating in low and high voltage applications to safeguard employees from burns, shocks, fires and certain types of explosions. These gloves are checked certified according to the ASTM F496 safety requirements.
  • If you are dealing with any type of receptacle at your house then be sure to switch off the mains. It is likewise a great idea to install an indicator or sign on the circuit box/service panel. This should stop people from mistakenly turning the main switch on.
  • Avoid having any type of liquid close by as electricity and liquids do not play nice together.
  • Use insulated tools while working with electricity.
  • Never ever attempt fixing energized devices. Constantly inspect that it is de-energized initially by using a tester. When an electrical tester touches a hot or live wire, the light bulb inside the tester brightens revealing that an electric current is streaming via the corresponding wire. Examine all the cables, the external metal covering of a service panel and also any type of various other hanging cables with an electric tester prior to starting your job.
  • Do not use any steel or aluminium ladder if you are working with any kind of receptacle in your house or anywhere else. An electric current will certainly ground you and certainly go through your body. Instead, use of a bamboo, wood, or a fiberglass ladder.

Insulating A wire

Insulating a wire is a way to protect it from the elements and make it last longer. It also protects people who are working with the wire or who might come in contact with it.

Insulating a wire can have some drawbacks, though. The protection offered by electrical insulation reduces current capacity and increases voltage drop.

If the insulation is damaged, that can lead to short circuits, electric shock or fires.

There are several ways you can insulate a wire. Some ways are better than others. You should think carefully before you decide how to insulate your wire.

Three common ways to insulate a wire are: plastic, rubber, and metal.

Plastic is good for electrical insulation because it is made of non-conductive materials. Plastic has many other benefits as well. Plastic is easy to mold into a variety of shapes and it does not corrode easily. Plastic is also inexpensive. Rubber is another material that makes good insulation for electric wires. Rubber is flexible and strong, which makes it ideal for situations where the cable may be bent or pulled upon frequently (such as in an automobile). Rubber also resists moisture, which makes it a popular choice for outdoor cables such as power lines carrying electricity from a power plant to homes and businesses in cities and towns across America. Metal is an excellent conductor of heat and electricity, so metal cables do not need additional insulation like plastic or rubber cables do; however, metal cables have several disadvantages compared with plastic.

Answer from Quora

Lewis Edge has a B.S. Electrical Engineering, from the Georgia Institute of Technology (1964) and is well knowledgeable in the field.

If every RV with a 50-amp plug actually used anywhere near 50-amperes per leg of the 240 volt connection, then #4 wire would be recommended to minimize voltage drop. However, the reality is that all but the largest all-electric motorhomes use far less than 50-amps. My motorhome is a fully-equipped 35-foot long Winnebago Itasca with two rooftop air conditioners. The range is gas. The refrigerator can run on either gas or electricity. All of the overhead lighting is supplied by 12-volt LEDs. The water heater can run on either gas or electricity or both. Even with every electric appliance in our coach running at full tilt, our motorhome does not use enough current to trip a 30-amp, two-pole, 240-volt breaker. While traveling through western Canada we found many campgrounds that had no electrical connections greater than 30-amps at 120 volts. Just turning off one of our rooftop air conditioners was enough enable us to power everything else with such a connection. Before investing in #4 four-conductor copper wire for a 60-foot run, which would be not only expensive, but cumbersome and heavy, I would suggest using an ammeter to measure how much current (amperage) the RV requires. We can run our motorhome just fine with sixty feet of #10/4 wire without a significant voltage drop. Just make sure that there is a 30-amp breaker to protect the wire. Otherwise, you’ll need to use #6/4 copper wire with a 50-amp breaker.
— Lewis Edge

So what size wire for 30 amps?

You should use the No. 10 AWG size for a 30 amp wire. This is a safe place to start.

You just learned about which type wire is best for 50 amps. If you are in the market for green power then check out portable solar generators.

If you enjoyed reading this article, you should take a look at our article at how much rv you can afford.


So what size wire for 50 amp rv service? The best size for a 50 amp rv service is 6 AWG. It is extremely necessary to know the right size wire for anything you are doing as this will keep everyone safe. Nobody wants to start a wiring job and then a fire starts that could have been avoided by just using the right size wire.

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