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If you’re looking for wire size for a 10 amp circuit (this can be for a 10 amp 120-volt circuit, breaker, battery output), you will need an AWG with at least 10 amp rated ampacity at 75°C.
In this system, 0000 AWG indicates a wire diameter of 0.46 inches, and 36 AWG indicates a wire size of 0.005 inches. There are 39-gauge sizes between these two sizes which you can get through logarithmic calculations. The ratio of different sizes is 1 to 92 in diameter. So, you can say that each AWG step is around the 39th root of 92, which is approx. 1.12293 times changes in diameter. If you’re looking for wire size for a 40 amp circuit (this can be for a 40 amp 220-volt circuit, breaker, battery output), you will need an AWG with at least 40 amp rated ampacity at 75°C. Despite being able to handle 100 amps (with 100 amp ampacity), the 3 AWG wire is more commonly used as a 100 amp wire size. If you translate that in watts, you get the result that a 20 gauge wire handles 132 watts for batteries. If you put it on a 120V circuit, the maximum wattage is 1,320W.
This overview article about AWG gauge wires will give you all the info you need about wire sizing. You can use it as a professional electrician but it’s primarily structured in such a way that anybody can get a good understanding of AWG gauge wire. We’ll start with the 10 amp wire size and work our way to the 200 amp wire size: 10 Amps Wire Size: AWG Gauge, Breaker, Suggestion For 110V-120V Circuit You can consult the wire ampacity chart from the 1st Chapter and see that the most appropriate wire size for 70 amps is 4 AWG wire. gauge wire is very frequently used. It’s important to know the diameter and cross-section of this wire; ie. 14 AWG wire to mm and 14 AWG wire to mm2.
gauge copper wire is also very frequently used by electricians. Due to its useful characteristics – we’ll cover 16 AWG to mm, 16 AWG to mm2, and 16 AWG amps and wattage – the 16 gauge electrical wire is widely used in home circuit boards, cars, and 12V batteries. You will find subchapters covering 10 amp, 15 amp, 20 amp, 25 amp, 30 amp, 40 amp, 50 amp, 60 amp, 70 amp, 80 amp, 90 amp, 100 amp, and 200 amp wire sizes in the 2nd Chapter. If you express the cross-section of a 12 gauge wire in mm2, you get 3.31 mm2. These diameter and cross-section figures are very useful because they determine how many amps can a 12 gauge wire handle. As we know, wattage or electrical power depends both on current (amps) as well as voltage. To answer how many watts can a 12 AWG wire handle, you also need to know the circuit’s voltage.
In the 1st Chapter, we focus on the wire gauge chart, denoting diameter (mm), cross-section (mm2), and amperage (maximum allowed amps) for each AWG wire. gauge wire, especially 9 gauge galvanized wire, is quite useful not in electrical applications but as a high tensile wire. You can consult the wire ampacity chart from the 1st Chapter and see that the most appropriate wire size for 30 amps is 10 AWG wire. Similar to the 4/0 gauge wire, the 3/0 AWG gauge wire is used for welding and for drawing the current (and power) out of large 12-volt or 24-volt batteries. With 130 amps capacity, 1 gauge wire can serve as a battery cable, welding cable, or any other power cable that requires a good 100 amps of electric current.
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