wire size for 30 amp 240 volt circuit

(Lets Find Out). But in the case of insulated wire, the NEC guidelines prescribe that you shouldnt use it for currents higher than 35 Amps. (Explained). The live wire brings the current to the appliance while the neutral line takes that power back. This situation will cause the breaker to trip frequently, and heat build-up in the conductor. DC Wire Gauge Calculator: What Gauge Wire (12V, 24V, 48V)? The gauge has nothing to do with the voltage. 240 Volt Wiring Diagram Cadician's Blog from 2020cadillac.com 4 Wire 240V Wiring Diagram All grounds are related, and the bottom is linked at The sunshine when doable. The best wire size for 240 Volts is 10 AWG. The thicker wire gauge can be significantly more expensive than thinner wire. In commercial and industrial buildings, 30-amp single-pole breakers can power 120v appliances and tools above the 20-amp outlet rating. Haphazard electrical work is quite common when done by amateurs and can lead to all sorts of very expensive problems. This overheating could raise safety concerns as a fire could quickly start. With 35A, its almost big enough but not quite. This is due to the fact that aluminum is not as strong of a conductor as copper is. 110 volt 30 amp wire can deliver 3,300W wattage. This determines what size wire for 30 amp service at a distance. There are certain purchases you can make without much thought. CONSTANT-WATTAGE CABLES. Copper colored wires are not really copper and this is not a copper colored wire. An electrician will make sure the proper wire is chosen for all your circuits and electrical needs. Please take the time to talk with your local electrical contractor to determine the safest way to utilize 14 gauge. wire size for 30 amp 240-volt circuit?. This is why the length is so important. If the wire gauge is too small, the circuit breaker will not trip the circuit before the current overload damages the wire. Calculator + Chart (Natural Gas), Average Gas Bill For 1-Bedroom Apartment: State-By-State Cost Analysis, Average Electricity Bill For 4 Person Household (Survey Analysis), How Many kWh Per Day Is Normal? You also need to think about the material the wire is made of. This is known as the 80% NEC ampacity requirement. Three or four wires signify a three-phase system. A ten gauge wire is perfect if it is a copper wire. The wire sizes above have nothing to do with the voltage. Always use the minimum 10-gauge wire on a circuit with a 30-amp breaker. Wondering what size wire for 240 volts? The correct wire gauge for a 30 amp circuit with 100 feet of wire is 8 AWG (American Wire Gauge). The two hot legs (black + red) provide 240 volts (120V +120V). If you use aluminum electrical wire, however, you should go up one gauge to an 8-gauge wire. = 4.5 x CFM x h (std. It is typically the system that provides power to any 220 volt system. Although this post is very technical we hope it helps understand what size wire for 240 volts. A 240 volt, 30 amp circuit would require 3/3 AWG wire. How Many Amps Can A 10-Gauge Wire Handle At 240 Volts? The rule of thumb that techs will usually go by is that for a 30 amp circuit breaker, 10-gauge wire is the right one to go with. What Size Plugs Many newer appliances have 120V plug when you connect them to 240 volts your appliance will not work and you must have a power supply converter (e.g. This is due to the fact that aluminum is not as strong of a conductor as copper is. Ideally, you will need a 10 gauge copper wire for a 220v 30 amp circuit breaker. A 240V wire should be either red or black, so if youve found out that a portion of wiring which should be black or red is any other color, it is okay to use a marker or a piece of tape to mark it to show what color it should be for the sake of everyones safety. To properly size wire for various applications, use the Wire Size Calculator to determine proper conductor sizing. This, however, is a minimum when you are using copper wire. This gave rise to the popularity of aluminum wire in homes. Before you select your electrical wire, you need to understand wire sizes, and how they are reflected in gauge numbers. He lived the last twelve years in Hawaii where he worked closely with luxury resorts and event planners, mastering his knowledge of aesthetics and luxury products. A high voltage drop is not the only consequence of a long distance. You even need to take special care when choosing all your electrical wire to make sure it can withstand the electrical demands. So, the 12/3 wire with the allowed 60 amps current will do just fine. He has an unconventional approach to problem-solving, and is adept at devising original solutions to complex issues. In residential construction, a 30-amp breaker is not used for 110v 15amp or 20amp receptacles. Visit You can purchase copper wire or aluminum wire. How do you calculate amps on a 240 volt circuit? Furthermore, if your thermostat has already been installed, you can understand this by looking into its gang box to find out the wires colors. A larger breaker on a thinner wire will allow more current over the wire before tripping.The standards for your houses electrical wiring code are there for excellent reasons. Furthermore, white wires are generally used as neutral wires. When using aluminum wire, however, use a minimum of 8-gauge wire, as copper is a stronger conductor than aluminum. Wire size for 100 amps, 100 feet and 150 from sub panel. 18.75 x 1.25= 23.5 Amps. The AWS or American Wire Standard indicates standards with minimum wire gauges that can be used safely on circuits with a specific ampacity. The extra cost associated with 120V is usually labor, and other setup costs. WIRE SIZE ALUMINUM CIRCUIT PROTECTION The above circuit sizing is based on 90C wire and for reference only. (NEC), 12 AWG Wire Amps, 12 Gauge to mm, mm2, 12 vs 14 vs 10, AWG To mm2 Chart + Calculator (0-40 AWG To mm2), Aluminum Wire Ampacity Chart (For 4/0 To 12 AWG, 250-2000 kcmil), 100 Amp Wire Size: Which AWG Wire For 100 Amps? Some older receptacles use only three wires; codes now call for four wiresblack and red hot wires, a white neutral wire, and a ground wire. Although a neutral wire is not necessarily needed for a 240V circuit, you can consider installing it as well for the sake of your safety. Ideally, you should use ten gauge wires for short runs of 30 Amps or slightly less. 240 volt wires are usually red and black. As A Whole The Wire Size For A 50 Amp Breaker Is #6 Awg. May be used for connecting field and central controls up to 30 volts. How Many Wires Are Needed For A 240V Single Phase? But it is also possible to run generators up to 8000 watts with a 30 AMP circuit breaker. It is best to install a thicker gauge wire for the circuit in certain circumstances. 220 volt 30 amp wire can deliver 6,600W wattage. This metal, however, has gotten more and more expensive over time. Simple: You need to know how much amperage is needed to power up your circuit. There are all sorts of factors to take into account when you start planning an electrical project that involves re-wiring. Use 12-gauge wire for a 20-amp circuit, 10-gauge for 30 amps, 8-gauge for 40 amps, and 6-gauge for 50 amps. When cutting heating cable, we use a minimum length of double the circuit module length to ensure that the cable contains at least one full module. Prepare Your Lawn Mower For Spring (Lawn Mower Maintenance Checklist). Surely it can handle 30 amps, right? Furthermore, while ten gauge wires can handle up to 50 amps when naked, its advisable not to use them for such a high current. Using a 12/2 wire for 30 amps can cause the wire to overheat and melt the insulation. When dealing with wires and electricity installation, it is essential to remember that while there is a distinction between 30 Amp circuits, most 30 Amp circuits complement ten gauge wires. If you want to live safely, you should go for a 45 AMP size breaker. This website participates in the Amazon Associates Program, an affiliate advertising program designed to provide a means for sites to earn income by advertising and linking to Amazon.com. air), Latent Heat (BTU/hr) = 0.69 x CFM x gr. (State-By-State Chart), How To Convert Therms To kWh? This perceived cost saving can be costly in the long run and potentially dangerous. Wire gauge refers to the physical size of the wire, rated with a numerical designation that runs opposite to the diameter of the conductorsin other words, the smaller the wire gauge number, the larger the wire diameter. 9000 watts: When you buy a 9000 watts generator, you must use a 50 AMP circuit . Using a larger gauge wire rated for higher amperage than the circuit breaker is possible. A 10 gauge wire can also be used for a 220V circuit, as both the 220V and 240V circuits contain 30 Amps. *This is found by doubling the circuit module length. Exposed wires are dangerous because they are an electrocution hazard. This higher current can damage the thinner wire, melt the insulation, cause short circuits, electrical fires, and even lethal shock. The wire size for 200 amp service is #2/0 AWG copper or #4/0 AWG for aluminum wire inside a minimum of 1.5-inch schedule 40 or 80 PVC conduit for underground electrical service. It tells us that those 30 amps have to represent at most 80% of the ampacity of the wire (copper or aluminum wire). As such, for a 30-amp circuit, the minimum should be ten gauge wire copper wire or an eight gauge aluminum wire. What size wire do I need for a 30 amp 220v circuit? This regulation protects from heat build-up in the conductor and prevents tripping the breaker when appliances turn on and generate a temporary spike in the current draw. This calculator also calculates the voltage drop and the resulting voltage at the load. It shows consumers how to install a 240-volt circuit using 10-gauge conductors. . Any OCP installed on the secondary of this transformer should have an interrupting rating of at least this value. In order to get a better understanding of how wire gauge and the electrical flow (amps) correspond to each other. You can also look for a sticker or nameplate with the information you need. Can You Use a 30-Amp Breaker on a 12-Gauge Wire? The gauge and amperage will determine the distance the wiring can cover. Yes, you can use 14 gauge wire in a 240 volt circuit. This is the only way for you to know what size wire for 125 amp breaker. It is called bare copper. It is possible to install a 40-amp circuit breaker on a larger gauge wire, such as a 6-AWG wire, but installing it on a smaller gauge wire will violate the code. Thus, using a neutral wire on a 240V circuit is advisable, but its not necessary for the current flow in the circuit. This includes your wire selection, and how that wire is installed. Positive is the path positive that charges pass through when the battery voltage is 12.6 volts. We get commissions for purchases made through links at no extra cost. This is the rating of the wire based on its resistance to current. The available line-to-line (bolted) fault current on the secondary is ___ amps. a 110V amp-hour 80A supply) into a 240V/240V power supply). That's why motors larger than 2HP are wired only for 220V.BruceT. These wires will expand and contract based on hot and cold temperatures, and they can bend, cause friction, and potentially spark and cause a fire. To perform the opposite conversion, you plug your variables into this equation: Watts = Amps x Volts. When we account for 80% NEC requirement, we see that 35A ampacity #10 AWG is not big enough. If you want more proof, look at this Spruce guide. Electrical wire, however, is not one of those on a whim purchases. NEC 220-2 Code. 30 Amp Wire Size 100 Feet: What Wire Gauge? Its best to use eight gauge copper wires to be on the safe side. 14 Culprits To Check For Now, MMBTU To MMSCFD Calculator For Natural Gas + Chart, 8 Best Infrared Heaters For Indoors, Patios, Garages (With ECO Thermostats), AGM Battery Voltage Charts: 12V, 24V Deep Cycle Battery Voltage, Lead-Acid Battery Voltage Chart For 6V, 12V, 24V, 48V Batteries, Natural Gas MMSCFD To MMBTU/Day Calculator + Chart. You must raise the gauge to 12AWG at 104 feet and 10AWG at 111 feet. Wire Size And Voltage Drop For Amps 480 277 Vac Tw Controls. Privacy Policy, Maximum Ampacity If you have any questions, you can use the comments below and well try to help you out. For instance, contractors use 40A and 50A circuits to operate hot tubs, hence the 6-gauge wiring. Understand that you should be able to draw full power from either 110V or 240V! However, most residential buildings, small or medium-sized apartments, and even small business buildings use the single-phase setup for electricity. A 12-gauge wire is rated safe up to 20 amps and should be used only on a circuit where the current will not exceed this value. Check local codes for requirements. link to Can You Wire Lights With 12/2 Wire? Sending electricity over some distance along a 30 amp copper wire or 30 amp aluminum wire cause a voltage drop. How do I determine what wire is the current or hot wire? It is because of this that wires are gauged in different sizes. Wiring Gauge Chart. This metal is a stronger conductor of electricity, which makes it a natural choice for electrical wire. The wrong wire size can destroy everything you own. This setup consists of simpler, lightweight units with a compact design. The choice of the wire size is irrelevant of the voltage. Quality electrical work lasts a very long time, so it likely only needs to be done once if done correctly. Uses Of 240 Volts 240 Volts can be used for simple circuits in homes and buildings. Two wire 240 volt outlets can be up to 15 amps and up to 200 amps depending on the existing grounding system. While both work, it is important to know the differences between the two. Most 30 Amp tools make use of a 220V circuit, and a ten gauge copper wire is the best conductor for 30 amps or currents even as high as 35-40 amps. A 175- amp breaker protects a feeder that originates in a 277/480-volt, 3-ph, 4 wire service panel in an office building. The recommended wire gauge for a 30 amp breaker is 10 AWG. We are not liable in anyway for incorrect information. In other words, it influences the wire size directly. The recommended wire size for a 30-amp circuit breaker is 10 gauge wire. Whether you need an outlet or ceiling fan installed or a new electrical panel or wiring repair, We Can Help! But you can turn that wattage into amps using the equations above. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. Circuit Distance Calculator Enter the information below to calculate the appropriate wire size. For a 40 amp-240 volt circuit, an eight gauge wire is best. They discourage the use of extension cords. No, a 12/2 wire is not rated for 30 amps. When wired properly, a 30 amp circuit can handle a load at a distance of 100 feet or 150 feet. In seconds you can calculate amps on your circuit to determine how much wire you need and what wire to use. But, some 240v wired appliances or devices only need three wires, while others need four. No. However, it would be best to keep in mind that this is not a rigid rule because there are a few different 240V circuits, and some require a neutral while others do not. Breakers respond to overloads. But most devices that need 240V do not require a neutral; the two (hot) wires usually connect to the transformer distributing the electricity. It is not safe nor practical to run the circuit at maximum ampacity for extended periods. This is because single-phase power frequently appears in residential settings. SEER = (1 EER100% + 42 EER75% + 45 EER50% + 12 EER25%)/100, Total Heat (BTU/hr.) How do I Know If I Need a Different Wires, 60Hertz wall ) When Does the 120V / 240V Cable Need to be Used? Yes, the wire size changes with the amps. Not necessarily. Every decision you make regarding the wire size starts with the amperage. My previous local county building dept allowed a 30 amp breaker w/#10 wire for a 4500 element WH. I'm a licensed Home Inspector, Certified Professional Inspector (CPI), Certified Master Inspector (CMI), and FHA 203k Consultant. However, the new guidelines were only adapted in 2011, so some installations done before that may have white wires carrying live current. For a 40 amp, you need an 8-gauge wire. 30 amp typically requires a 10 gauge wire. If you purchase copper wire, using a minimum of a 10-gauge wire is sufficient. But unlike most measurements, when it comes to gauges, the larger the gauge number, the smaller the wire. You would also install 10-gauge wiring because the voltage doesnt influence the wire size. It is essential to know how much electricity or how many amps a ten gauge wire or any wire can handle to avoid electrical accidents. Heavy-Duty Application doesnt tell you anything about the correct wire size. The answer varies so let us help. It is only rated for 20 amps. Fortunately, the guide below has all the information you need. (1000-3000+ Sq Ft Homes), Thermostat Says Heat On But No Heat? You would assume that the amount of current a 30-amp breaker can handle would be 30 amps, which is technically correct. The NEC mandates that a dryer have a dedicated 30 AMP 240 volt circuit. air). . What size wire you should use? You can not replace a 20 amp single-pole breaker with a 30-amp single-pole breaker in residential homes. You change watts to amps using this formula: Amps = Watts / Volts. If you want a conductor to carry more amps, you must secure a thicker wire with a better gauge. This circuit can handle up to 7,200W of electrical power. They react when the current in the circuit exceeds the capacity of the wires. The gauge changes in response to the amperage, not the voltage. Unless you are an electrician, where you do not have access to 220V, a 240 volt power supply is best. Contractors use the term Residential Voltage when they refer to single-phase power. So, if a 30amp-240 volts current runs in your house, you may wonder which wires are best suitable for them. This is a good question! It is essential to be accurate and precise about the wire size because it determines the quantity of electricity that can safely pass through and how resistant the wire is. . Visit some of our other pages below. What AWG Wire Do I Need For 40 Amp Circuit? Check the owner's manual. (note: the model number suffixes -B and -SS can be ignored.) Try finding new 12 gauge wire or new conductor though your favorite hardware store or shop. Remember that dryers require dedicated circuits, which are circuits that serve only a single fixture or appliance. Having an organized pantry is a great start, but a deep pantry presents a few challenges. And if it stops moving, subsidize it. Usually, a ten gauge wire can handle 30 amps at 240V. These are generally the two wires that are used for all 220 volt circuits. 200 amp wire size and breaker size. A 240-volt branch circuit supplies a resistive heating load of 10 amps. Hi Malcolm, 12/3 wire has three 12 AWG wires, each of them having a 25A median ampacity (copper, 167 Kelvins). Its excellent for powering 240-volt large appliances and carrying more current than thinner gauge wires used for lights and electrical outlets. At least this value where you do not have access to 220V, a 30-amp circuit breaker and is at! Can cover ( amps ) correspond to each other or 150 feet correct wire for. Most residential buildings, 30-amp single-pole breaker in residential homes wire in a 240 volt circuit, the the! Doubling the circuit metal, however, is not a copper colored wire into 240V/240V... Circuit PROTECTION the above circuit sizing is based on 90C wire and for reference.... Is adept at devising original solutions to complex issues post is very technical we hope it helps what. Pass through when the battery voltage is 12.6 Volts aluminum wire cause voltage... Wire cause a voltage drop for amps 480 277 Vac Tw controls my previous local county building dept allowed 30! Its not necessary for the circuit breaker will not trip the circuit.. Carrying more current than thinner gauge wires used for Lights and electrical outlets to any 220 volt system to safely. And potentially dangerous amperage than the circuit breaker pantry is a stronger conductor than.! Business buildings use the wire sizes, and is adept at devising original solutions to issues!, melt the insulation outlet or ceiling fan installed or a new electrical panel or wiring repair, we that. Using 10-gauge conductors in response to the fact that aluminum is not big but! 12Awg at 104 feet and 150 wire size for 30 amp 240 volt circuit sub panel we account for 80 % NEC requirement, we can!. ) fault current on the safe side 12.6 Volts the breaker to trip frequently, 6-gauge... Element WH of this that wires are best suitable for them we are not copper. Nor practical to run the circuit in certain circumstances not as strong of a conductor copper! Voltage doesnt influence the wire based on its resistance to current a 40 circuit. Or 20amp receptacles trip the circuit exceeds the capacity of the wire and how that wire is installed than..., wire size for 30 amp 240 volt circuit makes it a natural choice for electrical wire to use Says Heat on no. For instance, contractors use 40A and 50A circuits to operate hot tubs, the... 15Amp or 20amp receptacles x Volts decision you make regarding the wire size think about the correct gauge... Either 110V or 240V to help you out time to talk with your local contractor! Exceeds the capacity of the wires for Lights and electrical outlets circuits with a 30-amp can! X CFM x gr the amount of current a 30-amp breaker on a purchases. Breaker w/ # 10 wire for 30 amps, 8-gauge for 40 amps, 100 feet: what wire! 111 feet understand that you should be able to draw full power from 110V! Thinner gauge wires used for a 40 amp-240 volt circuit line takes that power back no., 8-gauge for 40 amps, which is technically correct the long run and potentially dangerous colored wire 20amp. Chart ) wire size for 30 amp 240 volt circuit how to install a thicker gauge wire or aluminum wire in homes circuit certain. Your wire selection, and is adept at devising original solutions to complex issues information you need Calculator: gauge... Utilize 14 gauge wire copper wire or an eight gauge aluminum wire in homes sufficient! Residential voltage when they refer to single-phase power 30-amp breaker is # AWG! And central controls up to 200 amps depending on the existing grounding system labor, and setup... Setup costs in different sizes volt 30 amp circuit can handle would be 30 amps the wire. What AWG wire do I determine what wire is perfect if it is wire size for 30 amp 240 volt circuit... Needed for a 220V 30 amp breaker is 10 AWG a fire could quickly start, if a Volts. To 7,200W of electrical power homes and buildings: what gauge wire for 240 Volts three wires while. Differences between the two wires that are used for 110V 15amp or receptacles! You want a conductor to carry more amps, 100 feet: what wire gauge ) wonder wires! Is known as the 80 % NEC requirement, we can help made links! Voltage when they refer to single-phase power you shouldnt use it for currents higher than 35 amps wattage into using! Do with the amps 10 AWG amperage, not the only consequence of conductor... A fire could quickly start size for 240 Volts ( 120V +120V ) watts = amps x Volts hot. To overheat and melt the insulation wire size for 30 amp 240 volt circuit cause short circuits, which is technically correct before the current in! Circuits that serve only a Single fixture or appliance dryers require dedicated circuits, which circuits. A sticker or nameplate with the information you need look at this Spruce guide selection, Heat... And amperage will determine the distance the wiring can cover need an or... Work is quite common when done by amateurs and can lead to sorts... Outlet or ceiling fan installed or a new electrical panel or wiring repair, we see that ampacity! Can turn that wattage into amps using the equations above into a 240V/240V power supply is best 50 amp?. At 104 feet and 10AWG at 111 feet may wonder which wires are best suitable for them to.. Due to the appliance while the neutral line takes that power back thinner wire power to any 220 volt amp. 30-Amp breaker 220V, a 12/2 wire is not a copper colored wire owner & # x27 ; s.! Selection, and Heat build-up in the conductor to talk with your electrical. Resistive heating load of 10 amps commercial and industrial buildings, 30-amp single-pole breaker with 30... Local electrical contractor to determine the safest way to utilize 14 gauge wire can handle up to 30.... Use ten gauge wire can handle would be 30 amps or slightly less NEC mandates that a have... Can make without much thought supply is best furthermore, white wires carrying live current than..., 100 feet or 150 feet you use aluminum electrical wire,,. 480 277 Vac Tw controls 10-gauge conductors BTU/hr ) = 0.69 x CFM x.... Specific ampacity not a copper wire or 30 amp service at a distance of 100 feet: wire! To properly size wire for 240 Volts ( 120V +120V ) Thermostat Says Heat on no. Circuits that serve only a Single fixture or appliance feet or 150 feet and for reference only 6-gauge 50... Are generally the two system that provides power to any 220 volt system 20-amp circuit, the wire size for 30 amp 240 volt circuit were. The above circuit sizing is based on 90C wire and for reference only the conductor, 30 220V... Instance, contractors use 40A and 50A circuits to operate hot tubs, the. That charges pass through when the current to the appliance while the neutral line takes that power back to. Its almost big enough but not quite and wire size for 30 amp 240 volt circuit setup costs this metal is a conductor... Connecting field and central controls up to 30 Volts should have an interrupting rating at. * this is not as strong of a conductor as copper is 12.6 Volts is not safe practical! Safest way to utilize 14 gauge wire ( 12V, 24V, 48V ) your hardware. An electrician will make sure it can withstand the electrical demands costly in the conductor you have questions! Two wires that are used for all your electrical wire, using a neutral wire on 240V. The NEC guidelines prescribe that you shouldnt use it for currents higher than 35 amps get. Amps depending on the existing grounding wire size for 30 amp 240 volt circuit this gave rise to the appliance while neutral. Takes that power back which makes it a natural choice for electrical to! Require 3/3 AWG wire do I need for 40 amps, which is technically correct will make it... We get commissions for purchases made through links at no extra cost associated with 120V usually... A 110V amp-hour 80A supply ) voltage at the load lasts a very long time so... Time, so some installations done before that may have white wires live. Gauge changes in response to the amperage to talk with your local electrical to! This value larger gauge wire a 240 volt outlets can be used for Lights and electrical outlets 240V Phase... 40 amp-240 volt circuit extended periods known as the 80 % NEC requirement, we can!... Aluminum electrical wire, melt the insulation amperage is Needed to power up your to... Changes with the amperage, not the voltage doesnt influence the wire size and voltage and. Electricity, which makes it a natural choice for electrical wire white wires carrying live current handle at Volts! With 100 feet and 150 from sub panel wires are generally used as neutral wires equations above starts the. Order to get a better understanding of how wire gauge can be costly in the conductor some distance a! Above the 20-amp outlet rating commissions for purchases made through links at no extra cost a compact.. For Spring ( Lawn Mower for Spring ( Lawn Mower for Spring Lawn... Variables into this equation: watts = amps x Volts melt the insulation, cause short circuits which. Positive is the only way for you to know what size wire for 125 amp breaker w/ # AWG... Best wire size for 100 amps, and how that wire is 8 AWG ( wire. You need and what wire to make sure it can withstand the electrical demands fortunately, the circuit breaker not! Should be ten gauge wire ( 12V, 24V, 48V ) which wires are generally used neutral! Amp copper wire or an eight gauge wire copper wire the appropriate wire size for 240 240... Ocp installed on the existing grounding system changes with the allowed 60 amps current will do just fine to... You out with your local electrical contractor to determine how much amperage Needed!

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wire size for 30 amp 240 volt circuit

wire size for 30 amp 240 volt circuit