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Double 30 amp breaker wire size

Double 30 amp breaker wire size

Whether you have a 30 amp or a 40 amp breaker, wire size is important. Wire is sold based on several factors. Gauge is a measurement of a wire, specifically its diameter. AWG is the standardized system of this measurement. Wire gauge is measured from high to low with higher numbers meaning a smaller wire size. Precise wire sizing is essential for circuit breakers as it helps determine how much electrical current can flow through it and how much resistance it has.

The chart below will tell you approximately what wire size is needed for the amount of power that will be running through the line. Please note that the information within this article is intended only as general guidelines. For any questions, always consult a certified electrician, as well as your local electrical codes.

In the chart below, we outline what gauge wire you need for the maximum amperage, or strength, of the electrical current.

What Size Gauge Wire Should I Use for a 20, 30, 40 or 50 Amp Breaker?

Note that the gauge can sometimes vary between aluminum and copper wires. Below is the gauge size based on the more commonly used copper wires.

Here are some more details about some of the more popular amperage sizes. Remember that when you use an appliance, always check the amp requirements first. You can calculate this by dividing Watts by Volts. Common appliances that require around 10 amps include: a toaster, a hair dryer, a vacuum cleaner, a radiator, a washing machine, a dishwasher, and a refrigerator.

The most common household item that requires a 30 amp circuit is a central air conditioner. Often, people living in RVs use 30, and sometimes 50, amp systems to run all the appliances in the vehicle.

Many electric cooking appliances require 40 amps such as electric cooktops. Fifty amp breakers are most often used to power many different appliances. However, a kitchen oven can alone require 50 amps. Many electric dryers also require a 50 amp breaker.

Next, you may see an additional number. When updating an appliance or air conditionerit is important to determine the correct current draw. If your circuit breaker is 20 amps, you cannot install a product that requires 30 amps. It is not as simple as just changing the circuit breaker. The wiring to the appliance also needs to be changed.

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Although, when the opposite occurs, the solution is easier. If you replace this with a new appliance that only requires 20 amps, you will need to change the circuit breaker and outlet receptacle — but you do not need to change the wire.

This is because a wire can safely carry less power than it was rated for without any potential issues.An existing outlet has a 10 gauge wire and 30 amp breaker on it already.

I would like to put a stove in this spot now but the documentation for the stove says I should have it on a 40 amp circuit even though one of the plugs I can buy for it has 10 gauge wires in it.

double 30 amp breaker wire size

So, my question is do I have to re-wire the whole run for this this will involve ripping out cabinets and drywall. Or can I get away with a 30amp breaker and 10 gauge wire for the stove? Will the stove really need to draw over watts provided by the 30 amp circuit?

I can't just use the 10 gauge wire and a 40 amp breaker can I? I've done a considerable amount of wiring before including v outlets. I just have never run into the situation where ripping out the 10 gauge is a nearly impossible task.

Well just to be clear. The documentation for the stove didn't say exactly how many watts it would be using. The documentation just said that you should have it on a 40 Amp circuit. And, since there is already 10 gauge wire there which is obviously capable of supporting 30amps I want to reuse what's there.

double 30 amp breaker wire size

I don't believe it would be safe to use a 40amp breaker with the existing wire. I guess I'm wondering about whether or not the stove could ever consume watts. I mean is that even realistic. What's the worst that could happen if the stove maxes out what the breaker will provide? The wiring should be rated to handle more than 30amps. The breaker should limit consumption to 30amps. Will parts of the stove just not work???

If nobody else responds with precise numbers as to what current guage wire can handle, you could stop into your local store that sells electrical wire and read the label on the guage wire. I think it'll handle a amp circuit OK, but don't have the for-sure info. Assuming the guage wire will safely handle the power requirement, you should be OK replacing the amp breaker with a Remember, I'm assuming there's nothing else on that circuit.Click to see full answer.

Just so, what size breaker do I need for a w water heater? The wiring requirements are less stringent for watt elements than for watt elements. Beside above, what size breaker do I need for a 50 gallon water heater? Most 50 amp water heater will come with watt elements. Electric water heaters require a volt dedicated circuit, which serves only the water heater and no other appliances or devices.

The circuit wiring typically includes a amp double-pole breaker and non-metallic NM or MC cable. What size breaker do I need for a 40 gallon water heater?

It may say on the side of it also. How many watts? Your average residential 30 or 40 gallon water heater is watts and usually goes on a 30 A breaker. What is the wattage of a 40 gallon water heater? A gallon litre tank with 4, watts in heating power will produce litres of hot water during this first hour. A gallon litre tank with heating power of 3, watts will provide litres of hot water. A bath requires an average of 50 to 70 litres of hot water, and a shower takes 40 to 60 litres.

Should I get a or watt water heater? The higher the BTU input and efficiency, the faster the recovery. Electric water heaters typically have one 5,watt or two 4,watt elements. Two lower-kilowatt elements will heat much faster than one higher-wattage element. Can I replace a Watt water heater with a Watt? You can buy watt elements to replace the watt units.

This is commonly done when the electric is NOT 10 gauge wire with 30 amp breaker. If it is 12 gauge and 20 amp you are limited to watt elements. What size breaker do I need for a volt water heater? Since this is a purely resistive load watts at volts is 23 amps, breaker is sized at 30 amps and 10 awg wiring is used.

In your case if the elements are strapped for watts draw is Both and watt water heaters are NOT correct if breaker is 20 amp and wire size is 12 gauge. The answer for 20 amp breaker and 12 gauge wire is to install watt elements. What size breaker do I need for a watt water heater? The bottom line is, a watt volt water heater should be on a 30 amp circuit consisting of 10 wire and a 30 amp single pole circuit breaker. How far does water heater have to be from breaker box?

Lay out a space that is 30" along the wall where the panel is located, and extends 36" from the front of the panel. You can mark the area on the floor. What size wire do I need for 30 amp breaker? Any circuit fused for 30 amps must use a minimum of 10 ga copper or 8 ga alu. Longer runs may require an upgrade of wire size.Bayside RV is reader-supported.

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When you buy through links on our site, we may earn an affiliate commission. Home - RV Power. Wiring your RV outlets is one of the fundamental tasks in keeping your RV fully operational.

How to wire a 30 amp RV breaker? Most RV owners ask this question since the majority of household equipment hold draw 30 amps. This may include driers, ovens, and air conditioners, which draw a large amount of electricity. When plugged into a shore power using a single cable, an RV turns into a single appliance.

It uses a volt current. This current must be fused by a 30 amp circuit breaker, single pole. This article will explain how to wire a 30 amp RV breaker safely and adequately. There are different techniques and various ways to do it, but we simplified it a bit for you. There are three types of outlets used to power an RV. These are available in hardware stores and even on Amazon. Choosing the appropriate outlet is very important in the process.

Smaller outlets are easier and cheaper to install. However, you can only use a few and smaller appliances in your RV with smaller outlets. For example, RVs that run on 50 amps will not be able to operate two air-conditioning units at the same time if it is plugged to a 30 amps outlet. If the number of appliances plug exceeds what your plug can accommodate, it might trip your breaker due to the high current.

In wiring your 30 amp RV breaker, there are some indispensable tools that you need to provide for an efficient and smooth installation:. Take note that the holes have to be aligned well in the weatherproof box and metal wall box. Pass your screws through both boxes and secure them thoroughly. The bare ground wire, or usually the green one, must always be connected to the U-shaped upper pin. These are just some essential tips to live by in securing your 30 amp outlet wiring.

Now that you have read all the technical know-bouts, you already know how to wire a 30 amp RV breaker. Sure, it may be challenging for starters, but once you delve into it, it won't be as hard anymore.

You may also watch some self-help videos to give you a better picture of installing wires with precaution and safety.

Always remember that safety is paramount and that live electricity is still deadly. The power should be turned off when working with electrical units. Double-check and never take the risk. Find out more about RV power. You can send us a note too. Types of Outlet in an RV. Regular Outlet - You can see these outlets around your house. This is used to supply power to small trailers. With this, a GFCI type is necessary, which should be at 20 amps, not 15 amps.

The usage is not the same as home outlets. Tools and Materials in Wiring a 30 amp RV breaker. Know where to locate your 30 amp outlet.We have conveniently named all the sections so you can skim the title and find the one that best fits what you came here to achieve. The typical rule of thumb that techs will usually go by is that when you have a 30 amp circuit breaker, gauge wire is the right size to go with.

For a 40 amp you need a 8-gauge wire size and for a 20 amp, you will need a gauge wire size. The corresponding size for 60 amp is a wire gauge size 4however there are certain important assumptions that that rule of thumb relies on — we will expand on those in the rest of this article. For 50 ampsthe rule of thumb is that you need a 6 gauge wire size. Looking for the NEC wire ampacity chart and gauge size rating tables across the internet, these are the values that we have been able to find which outlines the values in slightly great detail than the previous charts did, as per the NEC If you want a simpler chart for the standard type of wire, scroll down further.

But in some cases, the suitable wire gauge for a specific ampacity will change depending on the wire used and the ambient temperature rating, as you can see from the detailed table above. Other things like the type of load and the ambient rating of the wire as well as its termination points are other things you should be keeping in mind, as the above is only a rule of thumb.

Copper is known to carry more ampacity than aluminum, that is why at the same wire gauge, it can handle more compared to its aluminum counterpart. This means if you have a 6-gauge copper wire and a 6-gauge aluminum wire, the copper wire will allow more current to flow through it. Not only that, but wire gauges with a higher ambient temperature rating can be used at higher ampacity. These factors are what makes choosing the size of gauge wire to use for a 30 amp breaker not as straightforward as it seems.

Always remember that it is fine to get a wire gauze bigger than the recommended size for a circuit breaker, but you should never use a gauge wire that is smaller for the available ampacity of the breaker.

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This is basically the measure of the wire diameter that you will be using and it comes in different measurements. People will usually refer to 12 gauge wire, 10 gauge wire, 14 gauge wire, 8 gauge wire and 6 gauge wire rather than referring to the actual thickness of it, where one number refers to a specific thickness.

Contrary to logic belief, the higher the number, the smaller the diameter, and the easiest way to determine the thickness of some wire you may have lying around is by using a thickness gauge, in case it is not clearly indicated on it already which thickness you are dealing with. The reason you will want to make sure that you are using the right diameter is because the diameter determines the amount of current that can safely go through it, including the electrical resistance, and using the incorrect wire could have serious consequences, why different amounts of amps will require different diameters as well.

double 30 amp breaker wire size

The unit of measure is AWG, or American wire gauge, which is the most popular measure in the US and is in fact used in more than 65 different countries. For this article, since most of our readers are from America, we will be focusing on AWG. As the diameter of these wires determine how much electricity can safely be carried through them, it is obvious that not all diameters fulfill the purpose for every single machine.

A burned wire when you inspect your circuit breaker is a surprise that you do not want to get. Fortunately, this is an avoidable scenario if you know that having the right size of the gauge wire for a circuit breaker is important. The bad news is, this is something that a lot of people; they mistakenly believe that one wire is as good as any other so they attempt to make the connections themselves instead of calling for an electrician.

double 30 amp breaker wire size

Anything involving breakers, such as its connections, should be taken seriously because it has to do with electricity. If you have the right components installed, you will avoid any known electric hazards and issues common to circuit breakers and faulty connections.

In fact, many of these issues occur because of the wrong sized wire gauges used for the breakers. This is why it is important to know the right combination of the breaker and its compatible wire gauge sizes.

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If you have a 30 amp breaker right for your air conditioner, water heater, or clothes dryer that needs to be wired but you are clueless about what size of the wire gauge is needed, allow us to help you out with not just that but also in understanding the basics involving wire gauges. People believe that as long as both ends of a certain wire will fit a connector, they can use it for their connections with no issue.

Unfortunately, this is not the case for breakers. Those who are unaware of its importance often use too small gauge wires to connect their breakers, often because they want to save money since smaller wire gauges are cheaper. If you use larger wires on your breaker, the only effect it will have is on your budget.

This is because you ended up spending more than what you need to since larger wires cause more. It does not have an effect on your breaker nor will it cause damage to it, as it can handle the current that flows through it. These scenarios are totally avoidable, as long as you use the right wire gauge for a circuit breaker. While electrical work should ideally be handled by licensed electricians, it also helps to be personally aware of important aspects of your circuit breaker, such as the suitable wire gauge.It only takes a minute to sign up.

Just had a home inspection completed and one of the things advised to be corrected is the wiring running to an AC unit. In the breaker panel it's hooked up to a amp double pole breaker with 12 wire.

Inspector notes that 10 wire should be used for amp circuits so that the wire does not melt before the breaker can do its job in an over-current situation. This makes sense to me, but I'm thrown off by the double-pole configuration. Since the load is split over 2 conductors, does it really need to use such heavy gauge wire?

Depends on the specs of the unit. I would not expect the average home inspector to know this. Things are NOT always as simple as a chart at the home center or a simple electrical book. For an air con unit you would typically size the conductors to the minimum circuit ampacity MCAand size the breaker to the maximum overcurrent protection MOP. This is not a hard and fast rule, but it is typical and works for most installations.

See ThreePhaseEel's first comment to my answer over here where he calls out chapter and verse. I re-summarized it as follows:.

This is deep in the sort of NEC arcana that not everyone will know. So you may need to make them dig out their copy of NEC and do some reading.

10 gauge wire and a 40 amp circuit?

Most local inspectors only care about what they see at first impression. One can argue semantics all you want, but the inspector is going to want 14 wire matched up to a 15 amp breaker, 12 wire to a 20 amp, 10 to a 30 amp, etc. Arguing will very likely cause no end of future grief for the homeowner. Different insulation material ratings just add more confusion, as this will vary your wires maximum ampacity under code.

It is the wire insulation that breaks-down, not the current-carrying capacity. Unless you can show the inspector in the NEC codebook a valid exception, and gently convince said inspector to give you a variance, you will likely be in for a serious uphill battle.

As far as oversizing the breaker, good luck getting me to go for that!

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My six grandchildren were sleeping upstairs when the split hvac unit outside compressor locked-up and completely melted the bus bars in the main breaker panel with the breakers never tripping. I will NEVER over-current a wire, as I have seen way too many breakers fail to do their job, resulting in major repairs.

With so much material being manufactured outside of the U. Remember that the NEC code book states that following the minimum code requirements does not necessarily provide an efficient installation. Overkill will always trump skimping. Sign up to join this community. The best answers are voted up and rise to the top. Wire size for double pole breakers Ask Question.

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Wire Size Guide: What Size Wire Do I Need?

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