What you need to know about American Wire Gauge and how to correctly use wire sizes

When working with wiring, you'll quickly encounter the term American Wire Gauge . This system, also known as AWG, indicates the thickness of a wire or conductor. The correct wire gauge is essential for safe and efficient conduction. On this page, we explain step-by-step what AWG means, how to interpret the values, and how to apply the system when selecting the right cable.

How the American Wire Gauge System Came into Being and How It's Used

The American Wire Gauge system was developed in the United States in the nineteenth century as a standard for the wire thickness of electrical cables. The reason for this was simple: uniformity. Various systems were in use, and they weren't easily comparable, leading to errors during installation.

AWG is based on the number of twists required to reduce a copper wire to a certain diameter. The more times a wire is twisted, the thinner it becomes and the higher the AWG number. The system is still widely used in North America, and in the Netherlands, you'll also regularly see it on datasheets for network cables, speaker cables, and power cords.

How to Interpret Wire Sizes Using the AWG System

A key characteristic of AWG is that the system decreases. This means that the higher the AWG number, the thinner the wire. For example, an AWG 12 wire has a larger diameter than an AWG 24 wire.

For example:

• AWG 10 represents a wire with a diameter of approximately 2.59 millimeters
  

• AWG 16 is 1.29 millimeters in diameter
  

• AWG 24 has a diameter of only 0.51 millimeters
  
  

This decrease isn't linear, but logarithmic. This means that small differences in AWG can mean large differences in surface area and resistance. Therefore, it's important to carefully consider which value you need for your application.

What information you can get from a standard AWG table

A clear AWG table helps you quickly understand a cable's specifications. Below, you can see what you can get from such a table:

This table shows how wire thickness affects a cable's electrical properties. The thinner the wire, the higher the resistance, and the less current it can safely carry.

How to perform calculations based on wire size and resistance

To determine whether a cable is suitable for your situation, you can perform a few simple calculations. The most important of these is the voltage drop calculation.

Suppose you use a 20-meter AWG 16 cable carrying a current of 10 amps. The resistance of this cable is 13.17 ohms per kilometer, or 0.263 ohms over 20 meters (round trip). The voltage drop is then:

Voltage drop = current × resistance = 10 × 0.263 = 2.63 volts

At a mains voltage of 12 volts, this means a loss of over 20 percent, which is too much. In that case, you'd choose a thicker cable, for example, AWG 14 or AWG 12.

How to choose the right wire size for your application in practice

Selecting the right wire size involves more than just length and power consumption. Application and environmental factors also play a role.

Examples:

• Network cables: over long distances, cabling that is too thin can cause signal loss
  

• Speaker cables: with high power you want as little resistance as possible in the cable
  

• Solar panels: higher currents and low voltages require thicker cables to limit losses
  
  

Be careful when using it in domestic installations. Always use cables that comply with Dutch standards and safety guidelines. A wire that is too thin can overheat, posing a fire risk.

Some frequently asked questions about using AWG in different situations

How do I convert AWG to millimeters?

A handy rule of thumb is: the lower the AWG number, the thicker the wire . But if you want to know exactly, use a table or calculator.

Example: AWG 16 is 1.29 mm in diameter and has a surface area of ​​1.31 mm².

What is the difference between AWG and metric thread?

In Europe, metric designations in mm² are commonly used. AWG is more common in the US and for products from Asia or the Americas. The main differences:

• AWG is based on diameter, metric on cross-sectional area
  

• AWG is not linear, metric is
  

• AWG uses whole numbers, metric often works with decimals
  
  

Are there safety guidelines per wire thickness?

Yes. Each wire has a maximum current capacity. Exceeding this can lead to overheating. Therefore, always use a cable with a certain margin, especially for continuous use. Consult the cable's datasheet or a reliable AWG table for this.