Wiring Diagram for Sub Panel

Hello! Welcome to our comprehensive guide on wiring diagram for sub panels. In this article, we will discuss the importance of sub panels, their advantages and disadvantages, and provide detailed explanations on various sub topics related to wiring diagrams for sub panels. So, let’s dive right in!

1. Introduction to Sub Panels

A sub panel, also known as a sub distribution board or a subpanel, is an additional electrical panel that is connected to the main electrical panel of a building. It is used to distribute power to specific areas or circuits in a more organized and efficient manner. Sub panels are commonly used in larger homes, commercial buildings, and workshops where there is a need for multiple circuits.

Advantages of Sub Panels:

– Increased electrical capacity: Sub panels allow for the addition of more circuits, providing greater electrical capacity for the building.

– Enhanced safety: By distributing power to specific areas, sub panels can reduce the risk of overloading circuits and minimize the chances of electrical hazards.

– Convenience: With sub panels, it becomes easier to manage and control the electrical supply to different areas, making it convenient for troubleshooting and maintenance.

Disadvantages of Sub Panels:

– Cost: Installing a sub panel can be expensive, especially if it requires rewiring and additional electrical components.

– Space requirement: Sub panels require dedicated space, which may be a limitation in some buildings with limited available space.

– Complexity: Wiring a sub panel can be a complex task, requiring knowledge of electrical codes and regulations. It is recommended to hire a professional electrician for the installation.

2. Wiring Diagram for Sub Panel Components

When it comes to wiring a sub panel, it is important to understand the various components involved. Here is a detailed explanation of each component:

Main Panel

The main panel is the primary electrical distribution point in a building. It receives power from the utility company and distributes it to various sub panels or circuits.

Sub Panel

A sub panel is a secondary electrical distribution point that receives power from the main panel. It is typically located closer to the area it serves, such as a specific floor or section of a building.


Breakers are protective devices that automatically shut off the electrical supply in case of an overload or short circuit. They are installed in both the main panel and sub panels to protect the circuits.

Bus Bars

Bus bars are metal strips or bars that conduct electricity within the panel. They connect the breakers to the main power source and distribute power to the circuits.

Neutral and Ground Bars

The neutral bar is where the neutral wires from the circuits are connected, while the ground bar is where the ground wires are connected. These bars provide a path for the safe dissipation of electrical current.


Conductors are the electrical wires that carry the current from the panel to the circuits. They are color-coded for identification, with black or red wires carrying the hot or live current, white wires carrying the neutral current, and green or bare wires carrying the ground current.

Sub Panel Location

Choosing the right location for the sub panel is crucial. It should be easily accessible, well-ventilated, and away from any potential water sources or flammable materials. It is recommended to consult an electrician for determining the best location.

3. Alternative Wiring Diagram for Sub Panel

Another alternative wiring diagram for sub panels is the use of a sub panel with a separate grounding electrode. This method involves installing a grounding electrode, such as a ground rod, and connecting it to the sub panel. This provides an additional grounding path for increased electrical safety.

4. Wiring Diagram for Sub Panel – Complete Table

Component Description
Main Panel The primary electrical distribution point in a building.
Sub Panel A secondary electrical distribution point that receives power from the main panel.
Breakers Protective devices that shut off the electrical supply in case of an overload or short circuit.
Bus Bars Metal strips or bars that conduct electricity within the panel.
Neutral and Ground Bars Bars for connecting neutral and ground wires.
Conductors Electrical wires that carry current.
Sub Panel Location The ideal location for installing the sub panel.

5. Frequently Asked Questions (FAQ)

Q: Can I install a sub panel myself?

A: While it is possible to install a sub panel yourself, it is strongly recommended to hire a licensed electrician to ensure safety and compliance with electrical codes.

Q: How many circuits can I have in a sub panel?

A: The number of circuits in a sub panel depends on its amperage rating. It is best to consult an electrician to determine the appropriate number of circuits for your specific needs.


In conclusion, understanding the wiring diagram for sub panels is crucial for efficient and safe distribution of electrical power. Sub panels provide numerous advantages in terms of increased capacity, safety, and convenience. However, they also have certain disadvantages such as cost and complexity. It is essential to follow proper installation procedures and consult a professional electrician when dealing with sub panels to ensure compliance with electrical codes and regulations.