In that case, there might not be an issue if the wire size is slightly inferior. This is because the ground wires only carry current when there is a short circuit. The wire sizes for grounding are slightly different from those used for hot and neutral lines. The single-phase circuits are used in houses, and 3-phases are used in industries as they carry higher loads better. There are two common phases – single phase and 3-phase.Ī single phase needs 3 wires, but a 3-phase requires 4, one being the ground wire. The number of phases refers to the load distribution. The term may sound doubtful, but it is easy to understand. However, some industries may have a different voltage. Generally, 120 volts is the standard source voltage in the United States. The source voltage can differ from place to place. If you have increased the electric circuit in your house, you should consider the source voltage. If the wire diameter is thin, it won’t be able to carry the voltage drop. The wire gauge should be thick and superior if the voltage drop is high. The wire size will vary depending on the voltage drop. The standard voltage drop is considered to be 3%.īut, it can also drop to 5%, but that’s the maximum. In a circuit with 240 volts, the voltage should be up to 233v. Voltage drop refers to voltage loss because of the resistance when the current flows through the wires to appliances.įor example, if the voltage drop is 3%, in a circuit of 120 volts, the voltage should stay within 117 volts. However, if you install a 50 amp appliance in a 100 amp service 200 feet away, you need a 0 AWG wire.Īs you can see, the wire size for 100 amps changes along with the distance. 4 AWG copper wires, 250 kcmil in diameterįor running wires in 100 amp service 200 feet away, the wire size will be the same, i.e., 2 AWG copper or 4 AWG aluminum, or copper-clad aluminum.If you want to run wires for 100 amp service 300 feet away, use: 1/0 AWG copper wire or 3/0 AWG aluminum or copper-clad wire for 3-phase circuits.2/0 AWG copper wire or 4/0 AWG aluminum or copper-clad aluminum wire for single-phase circuits.If you want to run wires for 100 amp service 150 feet distance, you should get: Run only a kcmil wire for 100 feet or less.For 150 feet or less, use a #4/0 copper.
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