When it comes to electrical wiring, the size of the wire is tremendously important. It determines how much current can flow safely through it, and it’s vital to be sure you get the right size for the job. But when it comes to 220-volt wiring, the importance is magnified - incorrectly sized wire can cause a fire. So what size wire is for 220 volts? It depends on the amperage of the circuit and the length of the wire run.
Knowing the amps and the length of the wire run is critical for making sure you select the correct size wire. Amps are measured in amperes, or amps for short. They refer to the amount of electricity (measured in watts) that can be handled safely by a wire before it runs the risk of overheating and causing a fire. The length of the wire run is measured in feet. The longer the wire run, the more resistance the wire will have and the more voltage is lost over the length of the wire.
The National Electrical Code (NEC), the national standard for electrical wiring, specifies the size wire you should use for any given job. Most residential circuits are 15 or 20 amps. For 15-amp circuits, the NEC recommends using 14 gauge wire. For 20-amp circuits, the NEC recommends using 12 gauge wire.
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