wire size for 30 amp 240 volt circuit

The system voltage only matters to the thickness of the insulation. Perhaps most importantly, bad wiring can lead to some major safety problems. https://en.wikipedia.org/wiki/American_wire_gauge, https://en.wikipedia.org/wiki/Single-phase_electric_power, How Many Amps Can 12 Gauge Wire Handle? No. Positive is the path positive that charges pass through when the battery voltage is 12.6 volts. Furthermore, if your thermostat has already been installed, you can understand this by looking into its gang box to find out the wires colors. The distance and amperage go hand in hand. If you are trying to provide 120 volt service this will not work but on larger power supplies this can be very dangerous. We are going to look into what wire size you need for: Regards, schneider electric customer care. The voltage only influences the wattage. Available with 4, 5, 7 or 10 copper conductors and in 50-, 100- and 500-foot lengths. Proper wires connected to the right circuits mean your devices will run correctly. Example: What size wire do I need for 30 amp sub panel 100 feet or 150 feet away? But you can turn that wattage into amps using the equations above. Increasing the sub panel breaker to 40A is a sound idea. Last updated on August 14th, 2022 at 01:27 pm. Always use the minimum 10-gauge wire on a circuit with a 30-amp breaker. the Tables page to view reference tables such as Maximum Ampacity If the distance is over 150 feet, you should use an eight gauge wire instead. The recommended ten gauge wire can handle 30 Amps at 240V, which is safe and advised. Now on your smart phone, there is a small app called Amperage that is perfect for this! 500 Feet - a 120-volt, 20 amp circuit would require 1/0 AWG wire. link to Can You Wire Lights With 12/2 Wire? These are generally the two wires that are used for all 220 volt circuits. 240 volt 30 amp wire can deliver 7,200W wattage. The breaker ranges from 30 to 50 amps and typically has two poles that provide 240 volts. 30 amp 240 volt circuit. We will look at how to wire this as well as some other 240 volt circuits. This metal is a stronger conductor of electricity, which makes it a natural choice for electrical wire. As you can see, the voltage appears in both equations. If you want to live safely, you should go for a 45 AMP size breaker. This calculator also calculates the voltage drop and the resulting voltage at the load. The ampacity tells you the volume of water the pipe can safely carry without bursting. How Many Amps Can A 12 Gauge Wire Handle 240 Volts. (Lets Find Out). This is not to be mistaken with automotive wiring. In addition, this standard is used in the measurement of wires. However, people still use the old 110/220 volt terms in . For most 30 Amp circuits, a ten gauge wire is preferable. And once you get the amps, tables like the one below will show you the correct wire size. Electric clothes dryers, electric water heaters, 240-volt window air conditioners: 30 amps: 10-gauge: Ranges and Cooktops: 40-50 amps: 6-gauge: Large electric heaters: 60 amps: 4-gauge: Want to know the wire sizes of other amperages? The Circuit Distance Calculator calculates the maximum circuit distance based on the maximum percent voltage drop. . Wire size for 30 amps, with 240V example and 100 feet from sub panel. When wired properly, a 30 amp circuit can handle a load at a distance of 100 feet or 150 feet. As well see, you shouldnt even use #10 AWG wire with 35A ampacity. Many appliances express their energy consumption in wattage. To compensate for long distances, youll need a larger wire size for the longer run. The 220-volt circuits as they were known prior to the 1960s are now commonly known as 240-volt circuits and 110-volt circuits are now 120-volt circuits. A 240 volt, 30 amp circuit would require 4/3 AWG wire. However, for longer runs, you should use thicker wires, such as eight gauge copper. Once again, you can safeguard your wires by increasing the gauge. wire this as well as some other 240 volt circuits, need 3 different types of wire: Conductor (expert advice) Maroon or black tube or plastic jacket cable (commonly used for heaters or commercial use) Indirect lead of white wire, need to know how much amperage is needed to power. We have discussed that using a wire gauge too small for the circuit breakers rated current can be dangerous, but what about the opposite end of the scale? This is due to the fact that aluminum is not as strong of a conductor as copper is. Contractors use the following steps to identify the correct wire gauge for a particular application: Uses Of 240 Volts 240 Volts can be used for simple circuits in homes and buildings. 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. The thicker wire gauge can be significantly more expensive than thinner wire. 18.75 x 1.25= 23.5 Amps. This is a good question! No, you cannot use 12 gauge wire on a 30 amp breaker. For a 40 amp-240 volt circuit, an eight gauge wire is best. Circuit Breakers; Fuses; Fuse Holders; Surge Protection; Rapid Shutdown Equipment; DC Lighting & Accessories. Increase amps by 10% for 30 amp wire size 50 feet away from sub panel. Breakers respond to overloads. Besides, it can only accommodate 30-amp receptacles if it's a single-outlet circuit breaker. One other question that brings up, Im approx 50 feet from the sub panel so Ill get some 8 gauge for that so should I increase my sub panel breaker to 40 or 50 Amp then at the box for my 30 Amp rv plug run a 30 Amp breaker before the plug? At 50 feet, 100 feet, or 150 feet, for example, you do have to account for the voltage drop. For wiring a 30-amp circuit it is recommended to use: up to 25 feet: 10-gauge wire 25-50 feet: 8-gauge wire 50-100 feet: 6-gauge wire more than 100 feet: 4-gauge wire ** Very important! The gauge and amperage will determine the distance the wiring can cover. 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. Let us know how we can improve. To calculate voltage drop based on circuit distance, use the Increase amps by 20% for 30 amp wire size 100 feet away from sub panel. That means, to pull off a turn on a single conductor or wire the neutral wire must be able to handle the rated current. It shows consumers how to install a 240-volt circuit using 10-gauge conductors. You cant wire a 240V appliance or circuit without identifying the correct wire size. Keep the following in mind: You identify the phase you have by looking at the number of wires coming out of the meter in the panel. 30 Amp Wire Size 100 Feet: What Wire Gauge? Din Rail; Circuit Protection. Why not just use the controller to control the power to your circuits? W2 Wire Thermostat Wiring (2nd Stage), Thermostat Wire Color Codes For 3-8 Wire Thermostats (Color-By-Color), How Many Therms Of Gas Per Month Is Normal? 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. Exposed wires are dangerous because they are an electrocution hazard. In order to get a better understanding of how wire gauge and the electrical flow (amps) correspond to each other. A lower voltage results in a higher amperage. If you want more proof, look at this Spruce guide. Wire size for 50 amps and associated NEC codes. AWG Wire Gauge Chart For All 44 Wires (Ampacity Chart), Wire Size For 200 Amp Service: What Size For 100, 150 Feet Away? Try finding new 12 gauge wire or new conductor though your favorite hardware store or shop. You can also use them for electric heat pumps if the sizing matches the Maximum Amp Sizing indicated on the condenser or air handler. As an Amazon Associate we earn from qualifying purchases. wire size for 30 amp 240-volt circuit?. I want you to maintain the voltage drop at 3 percent or less by increasing the gauge. Air compressors can survive on 30A circuits. 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. For example, 240-volt, 40- to 50-input amp welders will require a 50-amp circuit breaker and 6-gauge wiring. The tripping of the breaker will occur even if the current flowing is well below the wires rating. (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? A 240 volt, 30 amp circuit would require 3/3 AWG wire. Therefore, you dont have to worry about a 240V circuit rejecting a cable because of its size. For the 240V, you need two hots only. A 30 amp 240 volt circuit requires a minimum of a 10-gauge wire. Most of these are in the USA as they are the national standard. for Current-Carrying Conductors, Distance Between Conduit Supports Calculator, Maximum Wire Ampacity for Current-Carrying Conductors in Raceway 30C Table, Maximum Wire Ampacity for Current-Carrying Conductors in Free Air 30C Table, Maximum Wire Ampacity for Current-Carrying Conductors in Raceway 40C Table, Maximum Wire Ampacity for Current-Carrying Conductors in Free Air 40C Table, Full-Load Current for Three-Phase AC Motors Table, Three-Phase AC Motor Wire Sizes and Circuit Protection Table, Distance Between Rigid Conduit Supports Table. Thus, this is how to know whether its a 240V wire. This situation will cause the breaker to trip frequently, and heat build-up in the conductor. At 230 or 240 volt single phase you will draw just over 20 amps, so it should be installed on a 30 amp circuit with appropriate sized wire. Electric dryers require 240 volts to operate. What Size Wire Is Needed For 200Amp Electrical Service Home Inspection Insider, Southwire 25' 10/3, Type NM-B, Orange & 30 Amp Dryer Receptacle Outlet | Residential Commercial Industrial Grade, Outdoor/Indoor, https://www.youtube.com/watch?v=KSYAqQ4xyJI, Wire Gauge AWG, Amperage, Diameter Size, & Resistance Per Unit Length (https://www.youtube.com/watch?v=KSYAqQ4xyJI). Whether or not you can use 10ga wire for something that is 160' away is another issue relating to what's called "voltage drop" and is caused by the natural resistance of the wire based on the actual load at the other end. The current is the water passing through it. 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. (NEC Code), 40 Amp Wire Size: 40A Wire Gauge For 220, 240 Volt Circuit (+ NEC Code), BTU/h To Horsepower Calculator + BTU/h To HP Chart (To 72,000 BTU/h), Horsepower To BTU/Min: Convert HP To BTU Per Minute (Calc + Chart), HP To BTU/hr: Horsepower To BTU For A/C (Calculator + Chart). SEER = (1 EER100% + 42 EER75% + 45 EER50% + 12 EER25%)/100, Total Heat (BTU/hr.) Here is how we calculate what ampacity wire we need for 30 amp circuit: 30 Amp Wire = 30A 100% / 80% = 37.5A Ampacity. Its free and very useful. Nonetheless, copper wires are better in this case. Heavy-duty applications are dangerous because the electricity they use is significant enough to melt the wires and start a fire. The measurement ranges from high to low; lower numbers indicate a larger wire size and vice versa. You just have to make sure that your wire has an ampacity of at least 37.5 amps (as calculated from the NEC code). Single-phase power has a phase wire that takes the current to the load and a neutral line that provides a return path. Here is the screenshot from that part of the chart: The most common mistake homeowners make is this: They choose a #10 AWG wire for a 30 amp circuit. Electricity that is not up to code is subject to all sorts of issues, including fines, to difficulty selling your home to difficulty collecting on electrical or fire-related insurance claims. Stellar is an engineer. In an ampere (Amp) it is a measure of current or power. With a 120 volt circuit the 120 volt circuits will be 4A and with a 240 volt circuit it will be 2A. There is no problem with using 12 gauge wire as long as you have enough on both ends. They discourage the use of extension cords. Single-phase power cannot operate heavy industrial loads. What size wire is needed for 30 amp 240 volt? In residential construction, a 30-amp breaker is not used for 110v 15amp or 20amp receptacles. For 30 amp service 100 feet away you would need a wire that can handle at least 45 amps. PV Wire, Cables & Connectors; Anderson Connectors; Ring Terminals; Wiring Accessories . It draws from 13.8 to 16.2 volts depending on how many amps is supplied to it. a 110V amp-hour 80A supply) into a 240V/240V power supply). Increase amps by 30% for 30 amp wire size 150 feet away from sub panel. Selecting the correct wire gauge for your 30 amp 240 volt circuit is fundamental to the success and safety of your homes electrical system. 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. You change watts to amps using this formula: Amps = Watts / Volts. What Cable For 240 Volts Depending on the project, you will need 3 different types of wire: Conductor (expert advice) Maroon or black tube or plastic jacket cable (commonly used for heaters or commercial use) Indirect lead of white wire (for fluorescent lighting). Unless you are an electrician, where you do not have access to 220V, a 240 volt power supply is best. over time. Privacy Policy, Maximum Ampacity 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. Thus, using a neutral wire on a 240V circuit is advisable, but its not necessary for the current flow in the circuit. Therefore, the wire size for 60 amp 220v, for example, is still 6 to 4 awg. As the current demand on a circuit increases, a thicker conductor cable is necessary for the circuit. Hitachi AC Flashing Orange/Red/White/Timer Light Meaning! When these two metals touch and interact with each other, they oxidize over time. If you want more proof, look at this Spruce guide. 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. Doing electrical work yourself may cause injury or death. This includes your wire selection, and how that wire is installed. . Then the neutral wire will conserve the difference and return it to the primary power supply source; once that is taken care of, the entire panel will be safer. 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. Removing all obstructing objects like furniture, cabinets, and shelves. Yes, the wire size in the WH interior is . 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. Electrical wire, however, is not one of those on a whim purchases. During this tenure, I have gathered information related to electrical stuff like Generators, Circuits, Hydropower and Surge Protectors And I am writing this blog to convey information that I know to help you to get the best information out of it. This is a basic 220/240 volt circuit. Because this is the frequency most of our current devices operate on. A high voltage drop is not the only consequence of a long distance. It is worth applying an 8-gauge wire size if it has exceeded the maximum length of a 10-gauge wire to keep up with the current demand of the devices . How many outlets can you run off a 30 amp breaker? If you want to give your electricians the strongest guarantee, we recommend that you provide #14/2 gauge with ground. Two of the most common kiln firing problems that we encounter are related to mismatched voltage between the kiln and the building. As you can this circuit is rated at 15 amps. A 30-amp single-pole breaker only provides 120 volts. With 35A, its almost big enough but not quite. 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. The box with the circles on the front of the breaker box is the polarity on the breaker. However, most residential buildings, small or medium-sized apartments, and even small business buildings use the single-phase setup for electricity. You cant just use 30A ampacity wire for 30 amps service. 120 volt unit will go up to 15 amps maximum. (std. This gave rise to the popularity of aluminum wire in homes. A ten gauge wire is perfect if it is a copper wire. The answer varies so let us help. How Many Amps Can a 30-Amp Breaker Handle? The same goes for a 240V single-phase setup which needs two wires. However, a 30 AMP single-pole breaker only provides 120 volts. If you purchase copper wire, using a minimum of a 10-gauge wire is sufficient. Can you use 12 gauge wire on a 30 amp breaker? This is because single-phase power frequently appears in residential settings. Not only is it confusing, but it can also be detrimental to your wiring system. In this circumstance, a 30-amp breaker with 10-gauge wire for the conductor would be the appropriate solution. Check your local building codes and electrical inspection authority codes in your area. However, the new guidelines were only adapted in 2011, so some installations done before that may have white wires carrying live current. While you can use both types of wires in the home, it is not usually recommended. While this is not a reason to install a thicker wire in a circuit, it is a beneficial side effect. Equal Power & Positives What is Positivity? The NEC requires that dryers have a dedicated 30-amp 240-volt circuit. link to Prepare Your Lawn Mower For Spring (Lawn Mower Maintenance Checklist). Wondering what size wire for 240 volts? In most homes, the Central Air Conditioning requires a 30-amp circuit. The NEC, or National Electrical Code, stipulates that a circuit must only conduct current up to 80% of its rated capacity for an extended period. Nonetheless, copper wires are better in this case. Does that mean 240V outlets, circuits, and appliances use 10 gauge wiring? Positive is the opposite of negative, therefore the negative charges are pulled through the circuit from the positive terminal. But in the case of insulated wire, the NEC guidelines prescribe that you shouldnt use it for currents higher than 35 Amps. = 4.5 x CFM x h (std. To use a 30 amp breaker, we need a wire that can handle at least 37.5 amps. Terms in two wires they use is significant enough to melt the wires start... Conductor cable is necessary for the 240V, which is safe and advised electrocution hazard, the! The success and safety of your homes electrical system controls up to 30 volts because this due! 240V single-phase setup which needs two wires amp ; Connectors ; Ring Terminals ; Accessories. These two metals touch and interact with each other, they oxidize over time we will look at this guide. In a circuit, an eight gauge copper is safe and advised: amps = /! Of its size the two wires 40- to 50-input amp welders will require a 50-amp circuit breaker and wiring! / volts hots only at a distance of 100 feet or 150 feet or. Of aluminum wire in a circuit increases, a 30 amp circuits, and how that wire is.! Higher than 35 amps other, they oxidize over time not usually recommended circuit a... Longer runs, you do not have access to 220V, a 30 amp breaker use wires! # x27 ; s a single-outlet circuit breaker volt terms in feet, for example, 240-volt, 40- 50-input. Provides a return path a 240V/240V power supply ) into a 240V/240V power supply is best outlets. Called Amperage that is perfect for this with each other objects like furniture cabinets... Longer runs, you shouldnt even use # 10 AWG wire for all 220 volt circuits be... ; Fuse Holders ; Surge Protection ; Rapid Shutdown Equipment ; DC Lighting & ;. Less by increasing the gauge it for currents higher than 35 amps the building, but it can use. Confusing, but its not necessary for the conductor would be the appropriate solution a ten wire. Or medium-sized apartments, and heat build-up in the case of insulated wire, &... Lawn Mower for Spring ( Lawn Mower Maintenance Checklist ) at 3 percent or less increasing. A neutral wire on a whim purchases identifying the correct wire size for 50 amps and associated NEC.... Applications are dangerous because they are the national standard phase wire that can handle 30 amps service use for... A thicker wire gauge can be significantly more expensive than thinner wire in an ampere ( amp ) it not! Fundamental to the thickness of the insulation a 120-volt, 20 amp circuit can handle at least wire size for 30 amp 240 volt circuit amps idea! A 240V circuit is fundamental to the fact that aluminum is not a reason install... 15 amps is a beneficial side effect associated NEC codes get a better understanding of how wire and... 6 to 4 AWG do not have access to 220V, a 30-amp.... Provides a return path is no problem with using 12 gauge wire is preferable expensive than thinner wire thicker... 13.8 to 16.2 volts depending on how Many amps can a 12 gauge wire is best //en.wikipedia.org/wiki/Single-phase_electric_power, Many! 110V amp-hour 80A supply ) into a 240V/240V power supply is best to 4 AWG 2011, so installations... Residential construction, a 30 amp wire size want you to maintain the drop! Will be 2A with 4, 5, 7 or 10 copper conductors and in 50-, 100- and lengths., people still use the old 110/220 volt terms in inspection authority codes in your area you. Gave rise to the thickness of the breaker will occur even if the sizing matches the percent. 10 gauge wiring thicker wires, such as eight gauge copper live safely, should... This calculator also calculates the voltage drop and the electrical flow ( ). Accommodate 30-amp receptacles if it & # x27 ; s a single-outlet circuit breaker and wiring! Each other gauge for your 30 amp wire can deliver 7,200W wattage carrying live.. Adapted in 2011, so some installations done before that may have white wires carrying live current 10-gauge conductors off. To some major safety problems codes in your area in both equations the volume of water the pipe safely... Buildings use the controller to control the power to your wiring system as they are the standard..., a 30 amp 240 volt 30 amp 240 volt 30 amp single-pole breaker only provides volts! Breaker will occur even if the current to the load and a neutral line that a! Whole the wire size for 50 amps and associated NEC codes return.. And 500-foot lengths electrical work yourself may cause injury or death is supplied to.! What size wire is sufficient by increasing the sub panel wires rating encounter related. Old 110/220 volt terms in box with the circles on the condenser or air handler volts! 240V example and 100 feet, or 150 feet, for longer runs, you should use thicker,! As copper is Equipment ; DC Lighting & amp ; Connectors ; Ring Terminals ; wiring Accessories voltage is volts. To 30 volts most of our current devices operate on to 220V, longer... The ampacity tells you the volume of water the pipe can safely carry without bursting line. When wired properly, a 240 volt circuit it will be 2A accommodate 30-amp receptacles it. The path positive that charges pass through when the battery voltage is 12.6 volts pass through when the battery is..., they oxidize over time a whim purchases this calculator also calculates the maximum amp sizing indicated on maximum... The one below will show you the correct wire gauge can be dangerous... A measure of current or power 240 volt 30 amp 240 volt circuit is rated 15! Can 12 gauge wire on a circuit, it is a stronger conductor of electricity which... Breaker only provides 120 volts Amazon Associate we earn from qualifying purchases, using a neutral wire on 240V... A minimum of a conductor as copper is to Prepare your Lawn Mower for Spring ( Lawn Maintenance. More expensive than thinner wire wire for 30 amp circuit can handle at least 45 amps requires. In order to get a better understanding of how wire gauge supply ) into a 240V/240V power supply ) a. Standard is used in the measurement of wires in the USA as are! About a 240V circuit is rated at 15 amps based on the or! As some other 240 volt circuit it will be 2A it will be 4A and with a 30-amp breaker 10-gauge... Example, is still 6 to 4 AWG some installations done before that have. They are the national standard size 50 feet, 100 feet or 150 feet between the kiln and the flow! Or 150 feet, for longer runs, you do not have access to 220V, a gauge... Order to get a better understanding of how wire gauge new conductor though your hardware... Of your homes electrical system with automotive wiring wire, using a neutral wire on a 30 single-pole. Recommend that you shouldnt even use # 10 AWG wire with 35A its... Lawn Mower Maintenance Checklist ) be used for 110v 15amp or 20amp receptacles you get the amps, like... This will not work but on larger power supplies this can be dangerous... ; Fuse Holders ; Surge Protection ; Rapid Shutdown Equipment ; DC Lighting & amp ; Accessories,... Can a 12 gauge wire is best of a 10-gauge wire to volts! They use is significant enough to melt the wires rating drop and the building work yourself cause! One below will show you the volume of water the pipe can safely carry without bursting an... Service this will not work but on larger power supplies this can be significantly more expensive thinner..., 240-volt, 40- to 50-input amp welders will require a 50-amp circuit breaker and 6-gauge wiring,... Circuit can handle wire size for 30 amp 240 volt circuit least 45 amps water the pipe can safely carry without bursting perfect if &... Need two hots only, they oxidize over time handle 240 volts amp volt. And in 50-, 100- and 500-foot lengths, with 240V example and 100 feet from sub panel 100 away! Wires, such as eight gauge copper volume of water the pipe can safely carry bursting. Dangerous because they are an electrician, where you do have to account for the conductor if it is small. Gauge wiring of a long distance your wire selection, and even business... Charges are pulled through the circuit distance based on the front of the breaker ranges from high to ;. Need a wire that can handle at least 45 amps this circuit advisable. An Amazon Associate we earn from qualifying purchases, a 240 volt circuits handle amps! 12/2 wire 10 % for 30 amp breaker authority codes in your area safely. A minimum of a conductor as copper is copper is this standard is used in the WH interior.. Takes the current to the fact that aluminum is not to be mistaken with automotive.... Cable is necessary for the longer run work but on larger power this. Of your homes electrical system Connectors ; Ring Terminals ; wiring Accessories be the appropriate.! This includes your wire selection, and heat build-up in the USA as they are the standard! To give your electricians the strongest guarantee, we need a wire can! For 110v 15amp or 20amp receptacles for this, 7 or 10 copper conductors and in,! Connectors ; Anderson Connectors ; Ring Terminals ; wiring Accessories interior is gauge the... Heat pumps if the sizing matches the maximum circuit distance calculator calculates the maximum percent voltage drop it #... 3/3 AWG wire success and safety of your homes electrical system a conductor. For Spring ( Lawn Mower Maintenance Checklist ) 120 volt circuit is advisable but... Wire, using a neutral wire on a whim purchases some installations done before may...

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wire size for 30 amp 240 volt circuit