3 Prong Extension Cord Wiring Diagram

Hello readers, today we will be discussing the topic of 3 prong extension cord wiring diagram. Extension cords are widely used in households and workplaces to provide power to various devices. It is important to understand the correct wiring diagram to ensure safety and proper functioning. In this article, we will explore everything you need to know about the wiring diagram of a 3 prong extension cord.

1. Understanding the Basics

Before we dive into the wiring diagram, let’s understand the basics of a 3 prong extension cord. A 3 prong extension cord consists of three wires – the hot wire, the neutral wire, and the ground wire. The hot wire carries the current from the power source to the device, the neutral wire completes the circuit, and the ground wire provides a safe path for the electrical current in case of any faults.


  • Provides safe and efficient power supply
  • Easy to use and install


  • Can be easily damaged if not handled properly
  • May limit the distance between the power source and the device

2. Wiring Diagram

Now let’s take a look at the wiring diagram of a 3 prong extension cord:

Wire Color Function
Black or Red Hot Wire – Carries the current from the power source
White Neutral Wire – Completes the circuit
Green or Bare Copper Ground Wire – Provides a safe path for electrical faults

It is important to note that the color of the wires may vary depending on the manufacturer. Always refer to the manufacturer’s instructions or consult a professional electrician if you are unsure about the wiring diagram.

3. Safety Precautions

When working with any electrical wiring, safety should be the top priority. Here are some important safety precautions to follow:

  • Always unplug the extension cord before working on it.
  • Inspect the cord for any damage or wear before each use.
  • Do not overload the extension cord with devices that exceed its capacity.
  • Avoid running the cord under carpets or rugs, as it can cause overheating.
  • Never modify the wiring of the extension cord.

4. Alternative Wiring Diagram

There is an alternative wiring diagram that is sometimes used for 3 prong extension cords. Instead of a ground wire, a polarized plug is used. The polarized plug has one prong wider than the other, which ensures that the hot wire is always connected to the wider prong, while the neutral wire is connected to the narrower prong. This provides some level of protection against electric shock.

FAQs (Frequently Asked Questions)

Q: Can I use a 3 prong extension cord for outdoor applications?

A: Yes, you can use a 3 prong extension cord for outdoor applications as long as it is specifically designed for outdoor use. Outdoor extension cords are made with weather-resistant materials to withstand exposure to moisture and other elements.

Q: Can I connect multiple extension cords together?

A: It is generally not recommended to connect multiple extension cords together. Each connection increases the risk of voltage drop and overheating, which can lead to electrical hazards. If you need to extend the reach of an extension cord, it is best to use a single cord of the appropriate length.

In conclusion,

The wiring diagram of a 3 prong extension cord is essential knowledge for anyone working with electrical devices. Understanding the correct wiring ensures safety and proper functioning. Always follow the manufacturer’s instructions and consult a professional electrician if needed. Stay safe and enjoy the convenience of your extension cord!