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They have a maximum amperage of 12 amps and are run on 14 AWG wire. Most household outlets run on a 15-amp breaker. If the new appliance needs a larger ampacity, the breaker, the outlet, and the wire will have to get upgraded as well.Ĭommon Household Appliances And Wire Sizes 15 Amp Wire Size If you are upgrading an appliance that requires less ampacity, you are allowed to just change the breaker and outlet to the correct size and leave the wire as is.

So, if you plan on installing a 15-amp breaker but, the total amperage is over 12 amps, you will need to up size to a 20-amp breaker and run 12 AWG wire. If an appliance only lists the wattage, you can calculate the amperage by dividing the wattage by volts.īreakers are supposed to be loaded to only 80% of their capacity. If you are planning to put multiple outlets on the circuit that certain appliances will be plugged into on a normal basis, you need to add up the total amperage between all of them. To properly size a breaker, you need to know the total amperage load it will be carrying. When adding a circuit breaker, it must have a higher ampacity than the load it will be carrying. Electrical safety must be the top priority! They will know all the national and local electrical codes that need to be followed. When deciding what size wire to use, first, you must make sure you have the correct size breaker! Once you know the size breaker you need, based off the amperage load, sizing the wire is pretty straight forward. Keep in mind this article is intended to be used as a guideline, if you have any questions or run into any problems, be sure to call your local electrician to come help. If it is just a new convenience circuit a 15- amp breaker with number 14, but if it is going to run something specific, I have to do some digging to get all the load information for that piece of equipment or appliance. 21(B) are followed.When installing a new breaker or changing out a breaker, it is critical to ensure the right size wire is being installed with it.Īnytime I am working on a home remodel myself or helping a client I make sure to figure out what the main objective for the circuit is going to be. The 8 & 6 conductors each are installed to separate disconnects, the 8 AWG disconnect has a 50 amp overcurrent device at the disco, and the 6 AWG disco has a 60 amp overcurrent device at the disco.Įven though the overcurrent device ahead of the 8 & 6 is 100 amps, the tap rule in 240.21(B) permits this, if all of the applicable requirements of.

Those 2 sets are sized at 6 AWG and 8 AWG respectfully. Each is spliced directly to the 2 AWG conductors without any overcurrent protection at the splice. In the trough there are 2 sets of other conductors (the taps). Those conductors are sized at 2 AWG copper. The tap conductors definition is located at 240.2.įor the benefit of those who do not have their NEC.Īs used in this article, a tap conductor is defined as a conductor, other than a service conductor, that has *overcurrent protection **ahead of its point of supply that exceeds the value permitted for similar conductors ***that are protected as described elsewhere in 240.4.”Ĭonductors from a 2-pole 100amp breaker are installed to a trough.