Thhn Wire Sizes Table

Angelena Stieglitz August 22, 2013 Uncategorized Leave a comment 412 Views

It's hard to imagine any home or office without electricity, and yet the wiring that makes it possible is often overlooked. Thhn wires are one of the most commonly used types of electrical wires, and understanding their sizes is key to ensuring your home or office is properly wired and up to code. This article will discuss thhn wire sizes table in detail, providing you with an understanding of the various sizes and what they mean for your wiring project.

Thhn wires can vary in size, ranging from 14 gauge to 2/0. The size of the wire is based on the American Wire Gauge (AWG) system, which assigns a number based on the wire’s diameter. The larger the number, the smaller the diameter of the wire. In addition to the AWG system, the National Electrical Code (NEC) also specifies the Ampacity, or current carrying capacity, of each size of thhn wire. Knowing the Ampacity of the wire is important when planning out the wiring for your project.

With that in mind, let's take a look at the different sizes of thhn wire and how they are used in wiring projects. The table below provides a summary of the various sizes and their respective Ampacity.

| THHN Wire Size | AWG | Ampacity |
|----------------|------|----------|
| 14 | 14 | 15 |
| 12 | 12 | 20 |
| 10 | 10 | 30 |
| 8 | 8 | 40 |
| 6 | 6 | 55 |
| 4 | 4 | 65 |
| 3 | 3 | 75 |
| 2 | 2 | 85 |
| 1 | 1 | 95 |
| 1/0 | 1/0 | 115 |
| 2/0 | 2/0 | 135 |
| 3/0 | 3/0 | 155 |
| 4/0 | 4/0 | 175 |

As you can see, the smaller the AWG number, the higher the Ampacity of the wire. A 14 gauge wire has an Ampacity of 15 Amps, while a 2/0 wire can handle up to 135 Amps. It's important to select the right size of wire for your project to ensure it is properly wired and safe.

When selecting the right size of thhn wire, it's important to consider the type of circuit you're wiring, the amount of current the circuit will draw, and the length of the circuit run. For instance, a long-run circuit (such as one running from an electrical panel to a room several feet away) may require a larger size of wire than a short-run circuit (such as one running from a switch to a light).

Knowing the thhn wire sizes table is essential for ensuring your wiring project is safe and up to code. The table above provides a summary of the various sizes and their respective Ampacity, but it's important to consult with a certified electrician to ensure the right size of wire is selected and installed correctly. Additionally, it's important to follow the NEC and local building codes when wiring your project to ensure it is done safely and correctly.