"THHN vs AWG: Key Differences & Comparison"
03.05.2025 ... AWG describes the size of the wire, while THHN cable describes the complete type of wire, including size, insulation and performance....
Understanding THHN and AWG: A Comparative Analysis
When it comes to electrical wiring, two terms that often pop up are THHN and AWG. Both are used to describe wire types, but they have distinct differences. Let's delve into the world of electrical wiring and explore the differences between THHN and AWG.
What is THHN?
THHN, or Thermoplastic High Heat Resistant Nylon, is a type of electrical wire coating. It's designed to withstand high temperatures, making it ideal for use in areas where heat is a concern, such as in attics, walls, and under floors. THHN wire is also resistant to moisture, chemicals, and abrasion, adding to its durability and longevity.
THHN wire is typically used for branch circuits, feeders, and equipment wiring. It's also used in underground installations due to its resistance to moisture and corrosion. The THHN jacket is marked with the letters 'THHN' followed by the wire gauge, for example, '12 THHN'.
What is AWG?
AWG, or American Wire Gauge, is a standard system used to measure the diameter of electrical wire. It was developed in the late 19th century to standardize the size of electrical wires. AWG is a logarithmic scale, meaning that each gauge size is approximately 1.12 times larger than the previous one.
AWG is used to denote the size of both THHN and other types of electrical wire. For instance, a 12 AWG wire is smaller than a 10 AWG wire. The AWG number is typically followed by the wire type, for example, '12 AWG THHN'.
THHN vs AWG: Key Differences
The main difference between THHN and AWG lies in their purpose. THHN is a type of wire coating, while AWG is a system for measuring wire diameter. However, they are often used together to specify a particular type and size of wire.
Purpose and Use
- THHN: Provides a durable, heat-resistant jacket for electrical wires.
- AWG: Measures the diameter of electrical wires, regardless of the wire type or coating.
Markings
THHN wire is marked with the THHN designation followed by the AWG size, for example, '12 THHN'. AWG size is used with all types of wire, not just THHN.
Heat Resistance
THHN wire is designed to withstand high temperatures, making it suitable for use in areas where heat is a concern. AWG does not denote heat resistance, as it only indicates wire size.
Moisture and Chemical Resistance
THHN wire is resistant to moisture and chemicals, making it suitable for underground installations and other damp environments. AWG does not denote resistance to moisture or chemicals.
Choosing the Right Wire
When choosing electrical wire, you'll need to consider both the wire type (like THHN) and the wire size (denoted by AWG). The wire type affects the wire's durability and resistance to heat, moisture, and chemicals. The wire size affects the wire's current-carrying capacity and suitability for a given circuit.
Always consult local electrical codes and a licensed electrician when selecting and installing electrical wire. They can provide guidance based on your specific needs and ensure your electrical system is safe and up to code.
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