Wiring Diagram 3 Prong Plug

Hello readers! Today, we will be discussing the wiring diagram of a 3 prong plug. This article aims to provide you with a detailed understanding of how to correctly wire a 3 prong plug. Whether you are an electrician or a DIY enthusiast, this information will come in handy when dealing with electrical appliances. So, let’s dive right in!

1. Introduction to 3 Prong Plug

A 3 prong plug, also known as a grounded plug, is a type of electrical connector commonly used in North America. It consists of three pins – two flat pins and one rounded pin. The flat pins are the live and neutral terminals, while the rounded pin is the ground terminal. The grounding feature is a safety measure to protect users from electric shocks and prevent electrical fires.

2. Benefits of Using a 3 Prong Plug

The main advantage of using a 3 prong plug is the added safety it provides. The grounding feature ensures that any excess electrical current is safely directed to the ground, reducing the risk of electric shock. This is especially important when using appliances with metal casings, as it prevents the casing from becoming live in case of a fault. Additionally, the grounded plug offers protection against electrical surges and voltage fluctuations.

3. Wiring Diagram of a 3 Prong Plug

When wiring a 3 prong plug, it is crucial to follow the correct diagram to ensure proper connectivity. Here is a step-by-step guide:

  1. Identify the live, neutral, and ground terminals on the plug.
  2. Strip the insulation from the end of the power cord to expose the wires.
  3. Connect the live wire (usually black) to the brass terminal, which is the smaller flat pin.
  4. Connect the neutral wire (usually white) to the silver terminal, which is the larger flat pin.
  5. Connect the ground wire (usually green or bare) to the green terminal or screw.
  6. Ensure that all connections are secure and there is no exposed wire.
  7. Carefully insert the wired plug into the receptacle, ensuring a snug fit.

It is important to note that if you are unsure about wiring a 3 prong plug, it is best to consult a qualified electrician to avoid any potential hazards.

4. Alternative Wiring Options for 3 Prong Plug

While the standard wiring diagram for a 3 prong plug is as mentioned earlier, there are alternative wiring options available for specific applications. One such alternative is the use of a polarized plug, where the neutral pin is wider than the live pin. This ensures that the appliance is always connected to the correct polarity, reducing the risk of electric shock.

5. Wiring Diagram FAQs

Question Answer
Can I use a 3 prong plug with a 2 prong outlet? No, it is not recommended. The grounding feature of the 3 prong plug will be rendered useless, compromising safety.
What if the power cord does not have color-coded wires? You can use a multimeter to identify the live, neutral, and ground wires based on their electrical properties.
Is it necessary to ground all electrical appliances? Not all appliances require grounding. It depends on the design and construction of the appliance.


In conclusion, understanding the wiring diagram of a 3 prong plug is crucial for safe electrical installations. By following the correct wiring procedure, you can ensure the proper functioning of your appliances and minimize the risk of electrical hazards. Remember, safety should always be the top priority when dealing with electricity. If in doubt, consult a professional electrician. Stay safe!