Their simplicity makes them easier to interpret. But a homeowner trying to select a suitable gauge for their extension cord is primarily interested in the gauge and ampacity, which is why tables like this one Gauge The other variables matter to engineers and contractors. This is why the majority of wire ampacity charts online only show the AWG and amps. Most laypeople will only open a wire ampacity chart to examine the wire gauge and ampacity. Every other column shows the ampacity of each gauge under different conditions. The first column of a wire ampacity chart shows the wire size. The ampacity and wire size are intimately intertwined. You can also calculate the other variables. But once you know the gauge, other tables can tell you everything you need to know. That is to say you can use the gauge to find the amps or the amps to find the gauge.ĭon’t expect to find this information in a conventional wire ampacity chart (except for the amps). Amps – Most laypeople use the gauge to find the amps.Others use tables like this one from The Engineering Tool Box, which reveals the wire gauges and their corresponding cross-sectional areas, diameters, and resistance. Some people use the wire thickness to calculate the resistance. The resistance, wire length, and thickness go hand in hand. Resistance matters because it influences the amount of heat a current generates as it passes through a wire. Resistance – The resistance is the opposition a current encounters as it flows through the wire. The AWG can show you the cross-sectional area. A larger cross-sectional area translates into a lower resistance per foot. If you want to calculate a conductor’s resistance, the cross-sectional area will help you.
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