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These are the standard amperage ratings for the wire size accompanied with the associated circuit interruption device that protects the wiring from overheating due to an over current due to too large a load or short circuit.
You've got to find the chart for the kind of wire you're actually using and follow it. For instance, someone down below insists that the correct answer is 10 AWG for 30 amps. That's only correct for 60*C rated copper TW and UF wire.
What you need depends on what you plan to do with it. For working with a solderless breadboard, you need #22 or #24 awg solid wire. This is small enough to fit into the breadboard and large enough to be held by the spring clips inside the breadboard. Wire of this size will also handle your 2-4 amps current for bigger applications.
Ampacity-wise, the 4/0 AWG gauge wire can handle the largest amount of current of any AWG gauge wire. At 75°C, the 4/0 copper wire ampacity is 230 amp (with 195 amps and 260 amps at 60°C and 90°C temperature, respectively). You can consult the electrical wire size chart above to find all this data.
In these AWG gauge charts, most common gauge values show the different characteristics of wire such as its diameter, area, ampacity, resistance, current density, fusing current and temperature ratings etc.
4-Gauge Wire VS Distance – Does It Affect Amp? Considering 70A, You can run 4 AWG copper wires for a maximum of 95 feet in a 120V circuit, 191 feet in a 240V circuit, and 383 feet in 480V. This is for a single phase.
Wire Size Chart. Electrical current is measured in amps. Each wire size, or wire gauge (AWG), has a maximum current limit that a wire can handle before damage occurs. It is important to pick the correct size of wire so that the wire doesn't overheat.
