![]() On the other hand, copper wires are better at maintaining consistent electrical flow at higher temperatures and offer better conductivity than aluminum wires. Because of the lower heat resistance, aluminum wires can heat up faster than copper wires, so they must be thicker to carry the same voltage. The two main differences between aluminum and copper wires are their resistance to heat and voltage.Īluminum wires have lower heat resistance and can be used for high-voltage applications. Copper Aluminum Maximum Distance 2 AWG 1/0 AWG 100 feet 1 AWG 2/0 AWG 200 feet 1/0 AWG 3/0 AWG 250 feet 2/0 AWG 4/0 AWG 300 feet 3/0 AWG 300 kcmil 400 feet Parameters 230 Volt, Three-phase, 3% voltage drop, 75 degrees C Aluminum vs Copper Wires For long distances, you’ll need a thicker wire to counteract voltage drop and ensure the circuit works properly at the end of the line. If you’re running a 125 amp circuit for longer distances, such as between two buildings, it’s important to select the correct wire size. The wire will have two hot wires, one neutral wire, and one ground wire, regardless if you select 1-gauge copper or 2/0 aluminum. ![]() ![]() Double pole breakers are rated for 240 volts, providing greater protection against short circuits, arc faults, and overloads. When wiring a 125-amp system, select a 125-amp double pole circuit breaker for a main disconnect. No matter what type of 125 amp wire size you choose, consult a certified electrician for help with the installation and use the size specified by the NEC table for your circuit. It costs less money than 1-gauge copper, is lightweight, and has excellent flexibility making it cost-effective for longer distances. Copper is the best option and provides superior conductivity, meaning it can efficiently handle higher electrical current demands.Ģ/0 aluminum is another popular wire size for 125 amp sub panel. Both have their own advantages, depending on your individual needs.ġ-gauge copper is the most common type of wire used in residential and commercial circuits for up to 125 amps. When determining the 125 amp sub-panel wire size, there are two types of 125 amp wire sizes: 1-gauge copper and 2/0 aluminum. The 200 amp wire size you need will increase the longer the distance run to account for voltage drop. Note on Wire Sizes: A #2/0 AWG copper or #4/0 AWG aluminum wire size is also used for 200 amps. With their expertise, you can rest assured that your electrical system is up-to-code and safe! Please consult a licensed electrician for more detailed information on the 125 amp wire size and breaker. With the proper installation, you won’t have to worry about arcing or short circuits, which can be a major safety hazard. By following these guidelines, you’ll have peace of mind that your 125 amp wire size and breaker are up to code and can handle all of your electrical needs.
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