Magnet Wire vs Coated Wire: Everything You Need to Know

January 21, 2023

So what is a Magnet Wire, and what is Coated Wire

When it comes to electrical wiring, it's important to understand the differences between various types of wire to ensure you choose the most suitable option for your project. Two commonly used types of wire are magnet wire and coated wire. Although these terms may be used interchangeably, they are not entirely the same thing. Magnet wire, also known as winding wire, is a specific type of coated wire. It is characterized by a thin insulation layer, known as enamel, which is applied to the wire to prevent electrical energy loss.

This type of wire is primarily used in the production of motors, generators, and transformers due to its flexibility and ability to transfer electrical energy efficiently. Coated wire, on the other hand, refers to any wire that has a protective coating or insulation layer.

This can include magnet wire, as well as other types of wire that are not specifically designed for use in magnetic coils. In this blog post, we will explore the specifics of magnet wire and coated wire in more detail, to help you make an informed decision when selecting the right type of wire for your project.

Coated Wire: An Overview

Coated wire, also known as insulated wire, is a type of electrical wire that has a protective coating or insulation layer around its metal core. This coating is typically made from plastics such as PVC or urethanes, and it serves to insulate the wire and prevent electrical energy loss. There are various types of coated wires available, each with its own performance characteristics.

For example, PVC coatings are commonly used for general-purpose insulation, while urethane coatings provide extra strength and protection against abrasion. The three most common types of coatings used on coated wires are tin, silver, and nickel. These coatings are applied to the surface of individual wire strands in electrical conductors to improve solderability, reduce oxidation (corrosion), or improve electrical properties at high frequencies.

Other materials used for wire insulation include thermoplastic and thermoset, THHN, and copper or aluminum. A popular type of coated wire is Copper-clad aluminum wire (CCAW), which is a dual metal electrical conductor composed of an inner aluminum core and outer copper cladding. This type of wire is known for its high electrical conductivity and durability.

Magnet Wire: A Brief History and Overview

The history of magnet wire dates back to the early 19th century, when aluminum and copper wires were first developed for use in electric motors. These wires had a thin insulation, which allowed electrical energy to be transferred through them without any interference from outside sources. As these motors grew in popularity and became more widely used, so too did the need for a wire that could carry magnetic coils and transfer electrical energy efficiently. This led to the invention of bondable wire, which was made up of an insulated conductor coated with a bond coat which provided extra protection against corrosion.

The bondable wire revolutionized motor windings and enabled manufacturers to create flexible and reliable coils for their motors. In addition, this type of magnet wire allowed engineers to create solid wire motor windings that were rigid enough not to break or become damaged during operation but still remained flexible enough to allow for winding around different shapes and contours. Furthermore, this type of magnet wire was found to be far less prone to rusting than other types of metal wiring due to its protective coating. As a result, many modern electric motors now use this type of wiring as part of their design.

Today's magnet wires have undergone various improvements over time and include various different types depending on the application they are being used for. This includes enameled wires with different thicknesses depending on how much flexibility is needed as well as litz wired with multiple strands braided together in order to improve electrical performance while reducing losses due to eddy currents. In addition, newer technologies such as Kapton tapes are also being used in order to further reduce losses at high temperatures while allowing even more flexibility than before. As a result, modern magnet wires are far superior compared to those of the past and offer unparalleled performance in almost any application imaginable today.

The name 'magnet wire' is derived from the German word 'litzendraht', which translates to 'braided wire'. It is also known as enameled wire, winding wire, and magnetic wire. In Europe and Asia, it is more commonly referred to as winding wire, while in North America it is referred to as magnet wire.

Magnet wire is an insulated copper or Aluminum conductor with a thin isolation layer, typically enamel or polyvinyl. It is most often used in transformers, motors, generators, inductors, windings and armatures. Enamel was one of the first coating elements used in Magnet Wires and it is still used for pickup coils for guitars and other electrical instruments. Modern magnet wire typically uses one to four layers (in the case of quad-film type wire) of polymer film insulation, often of two different compositions, to provide a tough, continuous insulating layer. Another example is when using Polyurethane with nylon for applications requiring high thermal properties and chemical resistance.


The enamel coating increases the electrical resistance of magnet wire making it suitable for high frequency applications and prevents arcing or short circuits in the winding coils while providing stability over a long period of time.

Insulation Types: What are some common types used in magnet wire and coated wire?

Insulation is a crucial component of magnet wire and coated wire, as it serves to protect the wire from electrical energy loss and external interference. There are several types of insulation commonly used in magnet wire and coated wire, each with its own unique properties and characteristics.

Some common types of insulation used in magnet wire include polyvinyl formal (Formvar), polyurethane, polyamide, polyester, polyester-polyimide, polyamide-polyimide (or amide-imide), and polyimide. These insulation materials have different properties and are used depending on the application, temperature range, and other factors.

Polyimide insulated magnet wire, for example, is capable of operation at high temperatures up to 250 °C (482 °F) and offers excellent electrical properties. Polyurethane insulation is known for its resistance to abrasion, while polyester-polyimide and polyamide-polyimide are known for their high thermal and chemical resistance.

It is essential to choose the appropriate insulation material for your application, as the insulation material can greatly affect the wire's performance, and lifespan. Factors such as the wire's operating temperature, mechanical stress, and chemical exposure should all be considered when selecting the insulation.


Magnet wire and coated wire are typically made of copper or aluminum, with copper being the most widely used conductor material. Copper has excellent electrical conductivity and windability, with a resistivity of 10.3 Ω/circ. mil/ft and an approximate melting point of 68°F. However, aluminum requires a 1.6-times larger cross-sectional area than copper to achieve comparable DC conductivity.

The debate between the use of aluminum and copper as a conductor material in the electrical industry has been ongoing for many years. While there are some technical arguments for both materials, many of them are inconsequential or based on misinformation.

In North America, aluminum is the predominant choice of winding material for low-voltage, dry-type transformers larger than 15 kilovolt-amperes (kVA) due to its lower initial cost. However, in most other areas of the world, copper is the preferred winding material. The cost of copper base metal has historically been more volatile than that of aluminum, making it a more expensive choice.

Additionally, aluminum has greater malleability and is easier to weld, making it a lower-cost manufacturing choice. However, reliable aluminum connections require more expertise and discipline on the part of transformer installers than those needed for copper connections.


Aluminum and copper line and load cables are incompatible.

Copper connections are more reliable compare to those from aluminum.

Copper has higher extensible strength than aluminum.

Science projects

Magnet Wires are an important tool for creating science projects. They can be used to manipulate electrical current and create powerful magnetic fields. Aluminum wire and copper wire are two of the most common types of magnet wire, both of which have different properties that make them useful in various applications. Aluminum wires offer more flexibility than solid copper wires, whereas copper wires conduct electricity more efficiently. Both types are coated with a bond coat to help provide insulation against electrical energy and to reduce corrosion.

Electricity transfer experiments

For science projects related to electricity, magnet wires can be used in many ways. By combining copper and aluminum wires with bond coat insulation, students can experience how voltage transfers through materials with varying levels of resistance. This makes it easy to measure current flow through different sizes of wire and understand the relationship between electrical energy and resistance in materials. Additionally, motors made from magnet wires help teach students about torque generation and motion control systems based on electronic components like transistors and resistors.

Magnetic field experiment

Magnet Wires are also great for science projects related to magnets and magnetic fields because they are easily manipulated into coils that generate a strong magnetic field when an electric current is applied. By winding several coils together in parallel or series circuits, students can learn how different configurations affect the strength of the magnetic field created by each coil as well as how this affects nearby objects such as nuts or bolts pulled towards or away from the coil by the force of the magnetic field created by the coil's current flow .

Kinetic energy experiment

Finally, Magnet Wires are perfect for educational demonstrations related to kinetic energy conversion because they enable students to easily construct simple machines such as wind turbines that convert mechanical energy into electrical energy. With only basic electronic components such as turbine blades connected together with magnet wire motor windings , students gain a better understanding of how sources like solar panels convert renewable energy sources into electricity at home while learning some practical concepts along the way! Using just a few materials like aluminum wiring, copper wiring, electrical insulation material, electronic components, magnets and even recycled pieces of wood , educators can create compelling lesson plans that demonstrate these concepts in a fun way!

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