what size wire is good for 125 amps
If you have a 125 amp breaker you need 125 amp wire. See the table here. You need to use the 75 column since no one makes a 90 breaker just yet. Since this is a single phase dwelling service you can use#2 AWG copper or 1/0 aluminumfor a 125 amp service or main feeder.
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What size wire do I need for a 125 amp breaker?
Use the 75 degree C column, unless you have a cable type which mandates use of the 60 degree C column. And, you round up to the next available breaker size. That means usually: 100A is #3 copper ($600/100ft) or #1 aluminum ($175/100ft). 125A is #1 copper or #1/0 aluminum (table ampacity is slightly less, but you get to round up).
What size wire do I need for 50 amps?
8 AWG wire has a rated ampacity of 55 amps. That is a perfect wire size for a 50 amp circuit. If you want to have an even safer circuit, you can use 6 AWG wire as the 50 amps wire size. Note: Do inform yourself about the specific characteristics of these wires before you buy one.
How many amps can 12 gauge wire handle?
In short, 12 gauge wire can handle 25 amps; it has an ampacity of 25A at 75C. It鈥檚 many times used as your go-to 20 amp size wire for a number of different applications.
How many amps can a 1/0 wire handle?
At 75C, it has a rated ampacity of 150 amps; essentially, the 1/0 W wire is a 150 amp wire size. At 60C, it can handle up to 125 amps, and it can handle up to 170 amps at higher temperatures (90C).