how to add a 20 amp circuit breaker


Welcome to the Complete Guide on How to Add a 20 Amp Circuit Breaker!


Electrical circuits are essential components of any building's infrastructure, providing power to various appliances and devices. However, as our reliance on technology grows, so does the need for more power. This is where adding a 20 amp circuit breaker comes into play. A 20 amp circuit breaker allows for greater electrical capacity and the ability to connect more demanding equipment and appliances. In this comprehensive guide, we will walk you through the process of adding a 20 amp circuit breaker to ensure the safety and efficiency of your electrical system.

The Importance of Circuit Breakers:

Before delving into the process of adding a 20 amp circuit breaker, it is crucial to understand the significance of these safety devices. Circuit breakers act as crucial safeguards, protecting your electrical system from overloading and potential fire hazards. They prevent excessive current from flowing through the circuits by tripping and interrupting the current flow. By adding a 20 amp circuit breaker, you not only expand your electrical capacity but also enhance the protection of your electrical system.

Things to Consider:

Before proceeding with the installation, there are a few essential factors to consider.

1. Assessing the Electrical Load: Start by evaluating your electrical load requirements. Identify the appliances and devices that will be connected to the circuit and ensure their combined wattage does not exceed the maximum capacity of a 20 amp circuit (approximately 2400 watts). If the load exceeds the capacity, you may need to consider other options such as a subpanel or upgrading your overall electrical system.

It is vital to distribute the electrical load properly to prevent circuit overloads and the potential risks they pose. Keep in mind that certain devices, such as refrigerators or air conditioning units, may require dedicated circuits due to their high power consumption.

2. Gather Necessary Tools and Materials: To successfully add a 20 amp circuit breaker, you will need a few essential tools and materials. These include:

- Circuit breaker panel

- 20 amp circuit breaker

- Wire strippers

- Screwdrivers (both flathead and Phillips)

- Wire connectors

- Electrical tape

- Wire nuts

- Cable clamps

- Safety gloves and goggles

It is essential to gather all the required tools and materials before starting the installation process to ensure a smooth workflow.

3. Understanding Electrical Codes and Permits: Prior to adding a 20 amp circuit breaker, it is crucial to familiarize yourself with local electrical codes and regulations. Adhering to these codes ensures the safety and legality of your electrical modifications. Additionally, you may need to obtain a permit for the installation, depending on your location and specific circumstances. It is recommended to consult with a qualified electrician or local authorities to ensure compliance with all necessary codes and regulations.

The Step-by-Step Process:

Now that we have covered the preliminary considerations let's dive into the step-by-step process of adding a 20 amp circuit breaker.

1. Turn Off the Power: Begin by turning off the main power supply to eliminate the risk of electric shock. Locate your circuit breaker panel and identify the main breaker switch. Flip the main breaker switch to the "Off" position to cut off power supply throughout the entire panel. To ensure safety, use a voltage tester to verify that there is no electricity flowing through the circuits before proceeding further.

2. Select an Appropriate Circuit Breaker Slot: Inspect your circuit breaker panel and identify a vacant slot to install the 20 amp circuit breaker. It is essential to choose a slot that matches the specifications of the breaker and remains clear from obstructions. Remember, if you are unsure or uncomfortable working with electricity, it is always best to consult a professional electrician.

Once an appropriate slot is selected, remove the panel cover by unscrewing the screws holding it in place. Set the cover aside in a safe location, as you will need to reattach it later.

3. Prepare the Wiring: Before connecting the new circuit breaker, you need to prepare the wiring. Begin by measuring the distance between the circuit breaker panel and the intended location of the new circuit. Cut a length of appropriate gauge wire, allowing some extra for flexibility during the installation process. Strip off about ¾ inch of insulation from both ends of the wire to expose the conductors.

To ensure safety and proper wire management, secure the wire to the panel using cable clamps. This will prevent accidental damage to the wiring and ensure a neat installation.

4. Attach the Circuit Breaker: With the wiring in place, it is time to connect the 20 amp circuit breaker. Start by attaching the black wire (hot wire) to the terminal situated at the base of the breaker. Insert the stripped end of the wire into the terminal and tighten the screw firmly to secure the connection.

Next, connect the white wire (neutral wire) to the neutral bar in the panel. Locate the neutral bar — it is typically a metal strip with multiple screw terminals. Loosen one of the screws, insert the stripped end of the white wire, and tighten the screw to establish a secure connection. Ensure that the wire is properly grounded, as this is crucial for safety reasons.

Lastly, connect the green or bare wire (ground wire) to the grounding bar. Similar to the neutral bar, the grounding bar is a metal strip with screw terminals. Loosen one of the screws, insert the stripped end of the green or bare wire, and tighten the connection appropriately.

5. Insert the Circuit Breaker: With the wires connected, it is time to insert the 20 amp circuit breaker into the vacant slot you previously identified. Position the breaker so that the notched edge aligns with the metal clips in the panel. Apply firm pressure to snap the breaker in place. You should feel or hear a distinct click when the breaker is securely positioned.

Note that the circuit breaker must be fully pushed into its slot to function correctly. If it is not seated properly, it may fail to trip during a circuit overload, compromising the safety of your electrical system.


In conclusion, adding a 20 amp circuit breaker can significantly enhance the electrical capacity and safety of your home or building. By following the step-by-step process outlined in this guide, you can confidently install a 20 amp circuit breaker while adhering to electrical codes and regulations. Remember to always prioritize safety and consult a professional if you are unsure about any aspect of the installation process. With the increased power capacity provided by a 20 amp circuit breaker, you can connect and operate more demanding appliances and devices, ensuring convenience and efficiency throughout your electrical system.


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