So to say #12 on a 30 amp breaker is wrong, is, well, wrong. The chart below will tell you approximately what wire size is needed for the amount of power that will be running through the line. The suggested circuit breaker size for the kitchen stove is 50 amps, 220 volts. 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. 50. 50 Amp 240 Volt Wire Size is 6-gauge or larger. 12. General household receptacles and lighting. : They offer 61% of the conductivity of copper wires but have only 30% of the weight of copper. residential wiring code. Here are some more details about some of the more popular amperage sizes. I know 6 AWG is good to 55 Amps. 30° C Ambient Wire Size Awg No. You can run a 10 gauge wire up to 85 feet on a 20 amp circuit. Kitchen countertop receptacles for small appliances. This current must be fused by a 30 amp circuit breaker, single pole. if the breaker is 30 amps, then the wire MUST be #10 or larger(8, 6, etc). A 30-amp breaker does not operate safely with a 12-gauge wire. Find the Best Garage Heater for Your Needs. Whether you have a 30 amp or a 40 amp breaker, wire size is important. 40. This could lead to breaker or appliance damage and be a fire hazard. Water heaters. 10ga wire at 220V 25A will drop voltage less than 2% in 90 feet, so your 45 feet will be no problem. Wire Size Guide: What Size Wire Do I Need? For instance, a 240 volt, 40 – 50 input amp welder will need a 50 amp circuit breaker plus 6-gauge wiring. Electric ranges. The back panel of the dryer specifies the size of breaker it requires, but most use a 30-amp breaker. A smaller 240 volt outlet on 10 gauge wire with a 30 amp breaker would handle most homeowner size mig welders.If the wall is open, then … Electric ranges. For a 20-Amp circuit use #12 copper wire (or #10 copper-clad aluminum wire).The fuse or circuit breaker feeding this circuit is rated for 20 amps. * If you have … BREAKER SIZE WIRE SIZE Based on copper THHN wire – increase one size when using aluminum conductors AT 115 VOLTS AT 230 VOLTS 15 amp #14 1,380 2,760 20 amp #12 1,840 3,680 30 amp #10 Seldom used on 115 voltage 5,520 40 amp # 8 Seldom used on 115 voltage 7,360 50 amp #6 Seldom used on 115 voltage 9,200 *60 amp # 6 Seldom used on 115 voltage 11,000 70 amp # 4 I know there's likely way more that goes into this (electrode size, work thickness, etc), but is this generally true? Other wire sizes follow the same rules. The 30-amp RV plug is commonly known as an RV-30. Here’s how to determine what size wire you need for your breaker. BruceT. 98 Again, thanks everybody for the answers. 30. Dual Element, Time Delay UL Class RK5 Fuse (Used with Properly Sized O/L Relay) Circuit Breaker (Instantaneous Trip Circuit Breaker) Continuous Amp Rating SINGLE PHASE UNITS ½ 115V 8.4 14 15A 15A ½ 208V / 230V 4.4 / 4.2 14 8A / 7A 7A ¾ 115V 11 12 15A 15A ¾ 208V/ 230V 5.5 … Wire gauge refers the physical size of the wire, rated with a numerical designation that runs opposite to the diameter of the conductors—in other words, the smaller the wire gauge number, the larger the wire diameter. 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. Below is the gauge size based on the more commonly used copper wires. 8. The typical rule of thumb that techs will usually go by is that when you have a 30 amp circuit breaker, 10-gauge wire is the right size to go with. power than it was rated for, otherwise it could get hot and create a fire hazard. ** 20. 30 amp circuit takes 10ga wire [unless very long runs, which you don't have]. a sustained 30 amp load on a 10 will get warm, but not dangerous. This article will explain how to wire a 30 amp RV breaker safely and adequately. CIRCUIT BREAKER SIZE Amp* 75°C THW WIRE SIZE MAXIMUM Amps Non-motor load any load any load 15 12 12 20 Normally smallest breaker 12 16 25 10 20 30 10 24 35 8 28 40 8 32 45 8 36 50 6 40 60 6 … The wire could overheat and melt. The resistance for a 100 foot cord (200 feet) for #10 is .25 ohms. It is not as simple as just changing the circuit breaker. 10. As with all electrical work, consult a professional with any questions about special circumstances. Do size the rest of the circuit for 60 amps (i.e. For a 30-Amp circuit use #10 copper wire and a fuse or circuit breaker rated for 30 Amps. When updating an appliance or air conditioner, it is important to determine the correct current draw. What Will Happen With the Wrong Size Wire? If your circuit breaker is 20 amps, you cannot install a product that requires 30 amps. 15. A 50 amp input stick welder can be put on 10 gauge wire with a 50 amp breaker because of Duty Cycle limitations. 14. Breaker / Fuse Size (Amps) Wire Gauge (Copper*) Most Common Application. 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.