![]() ![]() For instance, a 200 amp service 200 feet connection has about 40% more total amperage needs than a standard electrical connection at close range.Īnd because wires should only hold 80% of their rated amperage, you need to use a higher size than recommended to ensure safe electrical delivery. The NEC 310-16 rule dictates that the total amps for a 200-amp wire increases 20% per 100 feet of distance. As a general rule of thumb, aim for a wire length that won’t result in a drop above 3%. It’s because you need a smaller copper wire than an aluminum one to carry the same amount of current.Īlso, the voltage drop can become larger as the length of the wire used becomes longer. The Length Your Service Wire Runs MattersĪlthough both aluminum and copper wires have a general rating of 200 amps, the latter option is typically usable for longer distances. You can see the same concept when looking at other size wires, such as a 1/0 wire for both materials. ![]() Nonetheless, a copper-clad aluminum wire typically uses the same sizing reference as an aluminum variant.įor example, a 4/0 aluminum wire will have the same ampacity at 140 degrees Fahrenheit (60 degrees Celsius) as a 4/0 copper-clad aluminum variant. However, it’s still likely to break, split, or encounter other issues because of its lower tensile strength. It’s because this type of wire only uses a thin sheet of copper for its cladding, unlike the typical copper wire.Īlso, copper-clad aluminum is still reasonably lighter than copper. It’s still reasonably inexpensive when compared to copper wire. ![]() Here’s a chart of some examples of aluminum wires and their sizes based on their ampacities:Ī copper-clad aluminum wire is more durable than its standard counterpart. However, this lightweight and fairly less conductive construction also means sizing differs when choosing the correct aluminum wire size. It’s also lighter than its copper sibling, making it ideal for budget-conscious property owners. Take note of the benefits and drawbacks of using either option to ensure the circuit runs smoothly and safely.Īlthough aluminum isn’t as sturdy as copper, it’s a relatively inexpensive option. These wires can either be aluminum or copper-clad aluminum. Oftentimes, you would need two wires for underground electrical service. Here are some examples based on certain voltage and circuit distance requirements: This element generally coincides with the distance needed for the circuit. Voltage is another factor that plays a role in choosing the correct cable size. It should provide adequate current without being heavy. You may also use a 4/0 aluminum conductor to save costs. On the other hand, a 3/0 copper wire can be a better option than a 2/0 variant to provide adequate surge protection, particularly during thunder and lightning storms. Generally, a 2/0 copper wire is ideal for a 200-amp service that’s below the ground. Aside from the distance, you should also consider the amperage and voltage of the electrical service. What is the Correct Wire Size for 200 Amp Service Underground?Īs mentioned previously, the appropriate gauge wire to use for a 200-amp underground service often depends on multiple factors.
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