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Introduction
When it comes to electrical wiring, it’s important to choose the right wire size for the job. A wire that is too small can overheat and cause a fire, while a wire that is too large can be unnecessarily expensive. In this article, we’ll take a closer look at 125 amp wire size and what you need to know about it.
What is 125 Amp Wire Size?
125 amp wire size refers to the diameter of the copper wire that is used to carry electrical current for a circuit that is rated for 125 amps. The wire diameter is measured in American Wire Gauge (AWG) units, with smaller numbers indicating a larger wire size. For example, a 2 AWG wire is larger than a 6 AWG wire.
Why Use 125 Amp Wire Size?
125 amp wire size is commonly used for larger residential or commercial electrical circuits, such as those that power a central air conditioning system or an electric water heater. It’s important to use the correct wire size to ensure that the circuit can handle the electrical load without overheating or tripping the circuit breaker.
Calculating 125 Amp Wire Size
To determine the appropriate wire size for a 125 amp circuit, you’ll need to consider a few factors:
Length of the Circuit
The longer the circuit, the more resistance the wire will have, which can cause voltage drop. To compensate for this, you may need to use a larger wire size than what is typically recommended for a 125 amp circuit.
Number of Conductors
If you’re running multiple conductors in the same conduit or cable, you’ll need to factor in the additional heat generated by the proximity of the wires. This may require a larger wire size to prevent overheating.
Ambient Temperature
If the wire will be installed in an area with high temperatures, such as an attic or a garage, you’ll need to choose a wire size that can handle the additional heat.
Types of 125 Amp Wire
There are several types of wire that can be used for a 125 amp circuit, including:
THHN/THWN
THHN and THWN wires are commonly used for indoor and outdoor applications, respectively. They have a nylon coating that provides protection against moisture and abrasion.
XHHW
XHHW wire is a type of cross-linked polyethylene wire that is commonly used for larger circuits. It has excellent resistance to heat and moisture, making it a good choice for outdoor installations.
MC Cable
MC cable is a type of armored cable that contains multiple insulated conductors and a grounding wire. It provides additional protection against physical damage and is commonly used in commercial and industrial installations.
Conclusion
Choosing the right wire size is essential for a safe and reliable electrical system. If you’re working with a 125 amp circuit, be sure to consider the length of the circuit, number of conductors, and ambient temperature when selecting the appropriate wire size. And remember, when in doubt, always consult a licensed electrician.
